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authorRobert Richter <robert.richter@amd.com>2010-10-25 10:28:14 -0400
committerRobert Richter <robert.richter@amd.com>2010-10-25 10:29:12 -0400
commitdbd1e66e04558a582e673bc4a9cd933ce0228d93 (patch)
tree85f3633276282cde0a3ac558d988704eaa3e68af /kernel
parent328b8f1ba50b708a1b3c0acd7c41ee1b356822f6 (diff)
parent4a60cfa9457749f7987fd4f3c956dbba5a281129 (diff)
Merge commit 'linux-2.6/master' (early part) into oprofile/core
This branch depends on these apic patches: apic, x86: Use BIOS settings for IBS and MCE threshold interrupt LVT offsets apic, x86: Check if EILVT APIC registers are available (AMD only) Signed-off-by: Robert Richter <robert.richter@amd.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/Makefile1
-rw-r--r--kernel/cgroup.c2
-rw-r--r--kernel/cpuset.c4
-rw-r--r--kernel/futex.c66
-rw-r--r--kernel/futex_compat.c2
-rw-r--r--kernel/hung_task.c4
-rw-r--r--kernel/irq/Kconfig53
-rw-r--r--kernel/irq/Makefile3
-rw-r--r--kernel/irq/autoprobe.c15
-rw-r--r--kernel/irq/chip.c378
-rw-r--r--kernel/irq/dummychip.c68
-rw-r--r--kernel/irq/handle.c341
-rw-r--r--kernel/irq/internals.h39
-rw-r--r--kernel/irq/irqdesc.c395
-rw-r--r--kernel/irq/manage.c87
-rw-r--r--kernel/irq/migration.c12
-rw-r--r--kernel/irq/numa_migrate.c120
-rw-r--r--kernel/irq/proc.c26
-rw-r--r--kernel/irq/resend.c5
-rw-r--r--kernel/irq/spurious.c8
-rw-r--r--kernel/lockdep.c51
-rw-r--r--kernel/pid.c3
-rw-r--r--kernel/printk.c4
-rw-r--r--kernel/rcupdate.c8
-rw-r--r--kernel/rcutiny.c33
-rw-r--r--kernel/rcutiny_plugin.h582
-rw-r--r--kernel/rcutorture.c17
-rw-r--r--kernel/rcutree.c92
-rw-r--r--kernel/rcutree.h20
-rw-r--r--kernel/rcutree_plugin.h47
-rw-r--r--kernel/rcutree_trace.c12
-rw-r--r--kernel/sched.c307
-rw-r--r--kernel/sched_fair.c81
-rw-r--r--kernel/sched_features.h5
-rw-r--r--kernel/sched_rt.c40
-rw-r--r--kernel/sched_stoptask.c108
-rw-r--r--kernel/softirq.c73
-rw-r--r--kernel/srcu.c2
-rw-r--r--kernel/stop_machine.c8
-rw-r--r--kernel/time/ntp.c14
-rw-r--r--kernel/trace/ftrace.c4
-rw-r--r--kernel/trace/trace.c2
-rw-r--r--kernel/trace/trace.h4
-rw-r--r--kernel/trace/trace_functions_graph.c86
-rw-r--r--kernel/trace/trace_irqsoff.c152
-rw-r--r--kernel/trace/trace_sched_wakeup.c256
-rw-r--r--kernel/watchdog.c2
47 files changed, 2529 insertions, 1113 deletions
diff --git a/kernel/Makefile b/kernel/Makefile
index 4d9bf5f8531f..e2c9d52cfe9e 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -87,6 +87,7 @@ obj-$(CONFIG_TREE_RCU) += rcutree.o
87obj-$(CONFIG_TREE_PREEMPT_RCU) += rcutree.o 87obj-$(CONFIG_TREE_PREEMPT_RCU) += rcutree.o
88obj-$(CONFIG_TREE_RCU_TRACE) += rcutree_trace.o 88obj-$(CONFIG_TREE_RCU_TRACE) += rcutree_trace.o
89obj-$(CONFIG_TINY_RCU) += rcutiny.o 89obj-$(CONFIG_TINY_RCU) += rcutiny.o
90obj-$(CONFIG_TINY_PREEMPT_RCU) += rcutiny.o
90obj-$(CONFIG_RELAY) += relay.o 91obj-$(CONFIG_RELAY) += relay.o
91obj-$(CONFIG_SYSCTL) += utsname_sysctl.o 92obj-$(CONFIG_SYSCTL) += utsname_sysctl.o
92obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o 93obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index c9483d8f6140..291ba3d04bea 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -138,7 +138,7 @@ struct css_id {
138 * is called after synchronize_rcu(). But for safe use, css_is_removed() 138 * is called after synchronize_rcu(). But for safe use, css_is_removed()
139 * css_tryget() should be used for avoiding race. 139 * css_tryget() should be used for avoiding race.
140 */ 140 */
141 struct cgroup_subsys_state *css; 141 struct cgroup_subsys_state __rcu *css;
142 /* 142 /*
143 * ID of this css. 143 * ID of this css.
144 */ 144 */
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index b23c0979bbe7..51b143e2a07a 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1397,7 +1397,7 @@ static int cpuset_can_attach(struct cgroup_subsys *ss, struct cgroup *cont,
1397 if (tsk->flags & PF_THREAD_BOUND) 1397 if (tsk->flags & PF_THREAD_BOUND)
1398 return -EINVAL; 1398 return -EINVAL;
1399 1399
1400 ret = security_task_setscheduler(tsk, 0, NULL); 1400 ret = security_task_setscheduler(tsk);
1401 if (ret) 1401 if (ret)
1402 return ret; 1402 return ret;
1403 if (threadgroup) { 1403 if (threadgroup) {
@@ -1405,7 +1405,7 @@ static int cpuset_can_attach(struct cgroup_subsys *ss, struct cgroup *cont,
1405 1405
1406 rcu_read_lock(); 1406 rcu_read_lock();
1407 list_for_each_entry_rcu(c, &tsk->thread_group, thread_group) { 1407 list_for_each_entry_rcu(c, &tsk->thread_group, thread_group) {
1408 ret = security_task_setscheduler(c, 0, NULL); 1408 ret = security_task_setscheduler(c);
1409 if (ret) { 1409 if (ret) {
1410 rcu_read_unlock(); 1410 rcu_read_unlock();
1411 return ret; 1411 return ret;
diff --git a/kernel/futex.c b/kernel/futex.c
index 6a3a5fa1526d..a118bf160e0b 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -91,6 +91,7 @@ struct futex_pi_state {
91 91
92/** 92/**
93 * struct futex_q - The hashed futex queue entry, one per waiting task 93 * struct futex_q - The hashed futex queue entry, one per waiting task
94 * @list: priority-sorted list of tasks waiting on this futex
94 * @task: the task waiting on the futex 95 * @task: the task waiting on the futex
95 * @lock_ptr: the hash bucket lock 96 * @lock_ptr: the hash bucket lock
96 * @key: the key the futex is hashed on 97 * @key: the key the futex is hashed on
@@ -104,7 +105,7 @@ struct futex_pi_state {
104 * 105 *
105 * A futex_q has a woken state, just like tasks have TASK_RUNNING. 106 * A futex_q has a woken state, just like tasks have TASK_RUNNING.
106 * It is considered woken when plist_node_empty(&q->list) || q->lock_ptr == 0. 107 * It is considered woken when plist_node_empty(&q->list) || q->lock_ptr == 0.
107 * The order of wakup is always to make the first condition true, then 108 * The order of wakeup is always to make the first condition true, then
108 * the second. 109 * the second.
109 * 110 *
110 * PI futexes are typically woken before they are removed from the hash list via 111 * PI futexes are typically woken before they are removed from the hash list via
@@ -295,7 +296,7 @@ void put_futex_key(int fshared, union futex_key *key)
295 * Slow path to fixup the fault we just took in the atomic write 296 * Slow path to fixup the fault we just took in the atomic write
296 * access to @uaddr. 297 * access to @uaddr.
297 * 298 *
298 * We have no generic implementation of a non destructive write to the 299 * We have no generic implementation of a non-destructive write to the
299 * user address. We know that we faulted in the atomic pagefault 300 * user address. We know that we faulted in the atomic pagefault
300 * disabled section so we can as well avoid the #PF overhead by 301 * disabled section so we can as well avoid the #PF overhead by
301 * calling get_user_pages() right away. 302 * calling get_user_pages() right away.
@@ -515,7 +516,7 @@ lookup_pi_state(u32 uval, struct futex_hash_bucket *hb,
515 */ 516 */
516 pi_state = this->pi_state; 517 pi_state = this->pi_state;
517 /* 518 /*
518 * Userspace might have messed up non PI and PI futexes 519 * Userspace might have messed up non-PI and PI futexes
519 */ 520 */
520 if (unlikely(!pi_state)) 521 if (unlikely(!pi_state))
521 return -EINVAL; 522 return -EINVAL;
@@ -736,8 +737,8 @@ static void wake_futex(struct futex_q *q)
736 737
737 /* 738 /*
738 * We set q->lock_ptr = NULL _before_ we wake up the task. If 739 * We set q->lock_ptr = NULL _before_ we wake up the task. If
739 * a non futex wake up happens on another CPU then the task 740 * a non-futex wake up happens on another CPU then the task
740 * might exit and p would dereference a non existing task 741 * might exit and p would dereference a non-existing task
741 * struct. Prevent this by holding a reference on p across the 742 * struct. Prevent this by holding a reference on p across the
742 * wake up. 743 * wake up.
743 */ 744 */
@@ -1131,11 +1132,13 @@ static int futex_proxy_trylock_atomic(u32 __user *pifutex,
1131 1132
1132/** 1133/**
1133 * futex_requeue() - Requeue waiters from uaddr1 to uaddr2 1134 * futex_requeue() - Requeue waiters from uaddr1 to uaddr2
1134 * uaddr1: source futex user address 1135 * @uaddr1: source futex user address
1135 * uaddr2: target futex user address 1136 * @fshared: 0 for a PROCESS_PRIVATE futex, 1 for PROCESS_SHARED
1136 * nr_wake: number of waiters to wake (must be 1 for requeue_pi) 1137 * @uaddr2: target futex user address
1137 * nr_requeue: number of waiters to requeue (0-INT_MAX) 1138 * @nr_wake: number of waiters to wake (must be 1 for requeue_pi)
1138 * requeue_pi: if we are attempting to requeue from a non-pi futex to a 1139 * @nr_requeue: number of waiters to requeue (0-INT_MAX)
1140 * @cmpval: @uaddr1 expected value (or %NULL)
1141 * @requeue_pi: if we are attempting to requeue from a non-pi futex to a
1139 * pi futex (pi to pi requeue is not supported) 1142 * pi futex (pi to pi requeue is not supported)
1140 * 1143 *
1141 * Requeue waiters on uaddr1 to uaddr2. In the requeue_pi case, try to acquire 1144 * Requeue waiters on uaddr1 to uaddr2. In the requeue_pi case, try to acquire
@@ -1360,10 +1363,10 @@ out:
1360 1363
1361/* The key must be already stored in q->key. */ 1364/* The key must be already stored in q->key. */
1362static inline struct futex_hash_bucket *queue_lock(struct futex_q *q) 1365static inline struct futex_hash_bucket *queue_lock(struct futex_q *q)
1366 __acquires(&hb->lock)
1363{ 1367{
1364 struct futex_hash_bucket *hb; 1368 struct futex_hash_bucket *hb;
1365 1369
1366 get_futex_key_refs(&q->key);
1367 hb = hash_futex(&q->key); 1370 hb = hash_futex(&q->key);
1368 q->lock_ptr = &hb->lock; 1371 q->lock_ptr = &hb->lock;
1369 1372
@@ -1373,9 +1376,9 @@ static inline struct futex_hash_bucket *queue_lock(struct futex_q *q)
1373 1376
1374static inline void 1377static inline void
1375queue_unlock(struct futex_q *q, struct futex_hash_bucket *hb) 1378queue_unlock(struct futex_q *q, struct futex_hash_bucket *hb)
1379 __releases(&hb->lock)
1376{ 1380{
1377 spin_unlock(&hb->lock); 1381 spin_unlock(&hb->lock);
1378 drop_futex_key_refs(&q->key);
1379} 1382}
1380 1383
1381/** 1384/**
@@ -1391,6 +1394,7 @@ queue_unlock(struct futex_q *q, struct futex_hash_bucket *hb)
1391 * an example). 1394 * an example).
1392 */ 1395 */
1393static inline void queue_me(struct futex_q *q, struct futex_hash_bucket *hb) 1396static inline void queue_me(struct futex_q *q, struct futex_hash_bucket *hb)
1397 __releases(&hb->lock)
1394{ 1398{
1395 int prio; 1399 int prio;
1396 1400
@@ -1471,6 +1475,7 @@ retry:
1471 * and dropped here. 1475 * and dropped here.
1472 */ 1476 */
1473static void unqueue_me_pi(struct futex_q *q) 1477static void unqueue_me_pi(struct futex_q *q)
1478 __releases(q->lock_ptr)
1474{ 1479{
1475 WARN_ON(plist_node_empty(&q->list)); 1480 WARN_ON(plist_node_empty(&q->list));
1476 plist_del(&q->list, &q->list.plist); 1481 plist_del(&q->list, &q->list.plist);
@@ -1480,8 +1485,6 @@ static void unqueue_me_pi(struct futex_q *q)
1480 q->pi_state = NULL; 1485 q->pi_state = NULL;
1481 1486
1482 spin_unlock(q->lock_ptr); 1487 spin_unlock(q->lock_ptr);
1483
1484 drop_futex_key_refs(&q->key);
1485} 1488}
1486 1489
1487/* 1490/*
@@ -1812,7 +1815,10 @@ static int futex_wait(u32 __user *uaddr, int fshared,
1812 } 1815 }
1813 1816
1814retry: 1817retry:
1815 /* Prepare to wait on uaddr. */ 1818 /*
1819 * Prepare to wait on uaddr. On success, holds hb lock and increments
1820 * q.key refs.
1821 */
1816 ret = futex_wait_setup(uaddr, val, fshared, &q, &hb); 1822 ret = futex_wait_setup(uaddr, val, fshared, &q, &hb);
1817 if (ret) 1823 if (ret)
1818 goto out; 1824 goto out;
@@ -1822,28 +1828,27 @@ retry:
1822 1828
1823 /* If we were woken (and unqueued), we succeeded, whatever. */ 1829 /* If we were woken (and unqueued), we succeeded, whatever. */
1824 ret = 0; 1830 ret = 0;
1831 /* unqueue_me() drops q.key ref */
1825 if (!unqueue_me(&q)) 1832 if (!unqueue_me(&q))
1826 goto out_put_key; 1833 goto out;
1827 ret = -ETIMEDOUT; 1834 ret = -ETIMEDOUT;
1828 if (to && !to->task) 1835 if (to && !to->task)
1829 goto out_put_key; 1836 goto out;
1830 1837
1831 /* 1838 /*
1832 * We expect signal_pending(current), but we might be the 1839 * We expect signal_pending(current), but we might be the
1833 * victim of a spurious wakeup as well. 1840 * victim of a spurious wakeup as well.
1834 */ 1841 */
1835 if (!signal_pending(current)) { 1842 if (!signal_pending(current))
1836 put_futex_key(fshared, &q.key);
1837 goto retry; 1843 goto retry;
1838 }
1839 1844
1840 ret = -ERESTARTSYS; 1845 ret = -ERESTARTSYS;
1841 if (!abs_time) 1846 if (!abs_time)
1842 goto out_put_key; 1847 goto out;
1843 1848
1844 restart = &current_thread_info()->restart_block; 1849 restart = &current_thread_info()->restart_block;
1845 restart->fn = futex_wait_restart; 1850 restart->fn = futex_wait_restart;
1846 restart->futex.uaddr = (u32 *)uaddr; 1851 restart->futex.uaddr = uaddr;
1847 restart->futex.val = val; 1852 restart->futex.val = val;
1848 restart->futex.time = abs_time->tv64; 1853 restart->futex.time = abs_time->tv64;
1849 restart->futex.bitset = bitset; 1854 restart->futex.bitset = bitset;
@@ -1856,8 +1861,6 @@ retry:
1856 1861
1857 ret = -ERESTART_RESTARTBLOCK; 1862 ret = -ERESTART_RESTARTBLOCK;
1858 1863
1859out_put_key:
1860 put_futex_key(fshared, &q.key);
1861out: 1864out:
1862 if (to) { 1865 if (to) {
1863 hrtimer_cancel(&to->timer); 1866 hrtimer_cancel(&to->timer);
@@ -1869,7 +1872,7 @@ out:
1869 1872
1870static long futex_wait_restart(struct restart_block *restart) 1873static long futex_wait_restart(struct restart_block *restart)
1871{ 1874{
1872 u32 __user *uaddr = (u32 __user *)restart->futex.uaddr; 1875 u32 __user *uaddr = restart->futex.uaddr;
1873 int fshared = 0; 1876 int fshared = 0;
1874 ktime_t t, *tp = NULL; 1877 ktime_t t, *tp = NULL;
1875 1878
@@ -2236,7 +2239,10 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, int fshared,
2236 q.rt_waiter = &rt_waiter; 2239 q.rt_waiter = &rt_waiter;
2237 q.requeue_pi_key = &key2; 2240 q.requeue_pi_key = &key2;
2238 2241
2239 /* Prepare to wait on uaddr. */ 2242 /*
2243 * Prepare to wait on uaddr. On success, increments q.key (key1) ref
2244 * count.
2245 */
2240 ret = futex_wait_setup(uaddr, val, fshared, &q, &hb); 2246 ret = futex_wait_setup(uaddr, val, fshared, &q, &hb);
2241 if (ret) 2247 if (ret)
2242 goto out_key2; 2248 goto out_key2;
@@ -2254,7 +2260,9 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, int fshared,
2254 * In order for us to be here, we know our q.key == key2, and since 2260 * In order for us to be here, we know our q.key == key2, and since
2255 * we took the hb->lock above, we also know that futex_requeue() has 2261 * we took the hb->lock above, we also know that futex_requeue() has
2256 * completed and we no longer have to concern ourselves with a wakeup 2262 * completed and we no longer have to concern ourselves with a wakeup
2257 * race with the atomic proxy lock acquition by the requeue code. 2263 * race with the atomic proxy lock acquisition by the requeue code. The
2264 * futex_requeue dropped our key1 reference and incremented our key2
2265 * reference count.
2258 */ 2266 */
2259 2267
2260 /* Check if the requeue code acquired the second futex for us. */ 2268 /* Check if the requeue code acquired the second futex for us. */
@@ -2458,7 +2466,7 @@ retry:
2458 */ 2466 */
2459static inline int fetch_robust_entry(struct robust_list __user **entry, 2467static inline int fetch_robust_entry(struct robust_list __user **entry,
2460 struct robust_list __user * __user *head, 2468 struct robust_list __user * __user *head,
2461 int *pi) 2469 unsigned int *pi)
2462{ 2470{
2463 unsigned long uentry; 2471 unsigned long uentry;
2464 2472
@@ -2647,7 +2655,7 @@ static int __init futex_init(void)
2647 * of the complex code paths. Also we want to prevent 2655 * of the complex code paths. Also we want to prevent
2648 * registration of robust lists in that case. NULL is 2656 * registration of robust lists in that case. NULL is
2649 * guaranteed to fault and we get -EFAULT on functional 2657 * guaranteed to fault and we get -EFAULT on functional
2650 * implementation, the non functional ones will return 2658 * implementation, the non-functional ones will return
2651 * -ENOSYS. 2659 * -ENOSYS.
2652 */ 2660 */
2653 curval = cmpxchg_futex_value_locked(NULL, 0, 0); 2661 curval = cmpxchg_futex_value_locked(NULL, 0, 0);
diff --git a/kernel/futex_compat.c b/kernel/futex_compat.c
index d49afb2395e5..06da4dfc339b 100644
--- a/kernel/futex_compat.c
+++ b/kernel/futex_compat.c
@@ -19,7 +19,7 @@
19 */ 19 */
20static inline int 20static inline int
21fetch_robust_entry(compat_uptr_t *uentry, struct robust_list __user **entry, 21fetch_robust_entry(compat_uptr_t *uentry, struct robust_list __user **entry,
22 compat_uptr_t __user *head, int *pi) 22 compat_uptr_t __user *head, unsigned int *pi)
23{ 23{
24 if (get_user(*uentry, head)) 24 if (get_user(*uentry, head))
25 return -EFAULT; 25 return -EFAULT;
diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index 0c642d51aac2..53ead174da2f 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -98,7 +98,7 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout)
98 printk(KERN_ERR "\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\"" 98 printk(KERN_ERR "\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\""
99 " disables this message.\n"); 99 " disables this message.\n");
100 sched_show_task(t); 100 sched_show_task(t);
101 __debug_show_held_locks(t); 101 debug_show_held_locks(t);
102 102
103 touch_nmi_watchdog(); 103 touch_nmi_watchdog();
104 104
@@ -111,7 +111,7 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout)
111 * periodically exit the critical section and enter a new one. 111 * periodically exit the critical section and enter a new one.
112 * 112 *
113 * For preemptible RCU it is sufficient to call rcu_read_unlock in order 113 * For preemptible RCU it is sufficient to call rcu_read_unlock in order
114 * exit the grace period. For classic RCU, a reschedule is required. 114 * to exit the grace period. For classic RCU, a reschedule is required.
115 */ 115 */
116static void rcu_lock_break(struct task_struct *g, struct task_struct *t) 116static void rcu_lock_break(struct task_struct *g, struct task_struct *t)
117{ 117{
diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig
new file mode 100644
index 000000000000..31d766bf5d2e
--- /dev/null
+++ b/kernel/irq/Kconfig
@@ -0,0 +1,53 @@
1config HAVE_GENERIC_HARDIRQS
2 def_bool n
3
4if HAVE_GENERIC_HARDIRQS
5menu "IRQ subsystem"
6#
7# Interrupt subsystem related configuration options
8#
9config GENERIC_HARDIRQS
10 def_bool y
11
12config GENERIC_HARDIRQS_NO__DO_IRQ
13 def_bool y
14
15# Select this to disable the deprecated stuff
16config GENERIC_HARDIRQS_NO_DEPRECATED
17 def_bool n
18
19# Options selectable by the architecture code
20config HAVE_SPARSE_IRQ
21 def_bool n
22
23config GENERIC_IRQ_PROBE
24 def_bool n
25
26config GENERIC_PENDING_IRQ
27 def_bool n
28
29config AUTO_IRQ_AFFINITY
30 def_bool n
31
32config IRQ_PER_CPU
33 def_bool n
34
35config HARDIRQS_SW_RESEND
36 def_bool n
37
38config SPARSE_IRQ
39 bool "Support sparse irq numbering"
40 depends on HAVE_SPARSE_IRQ
41 ---help---
42
43 Sparse irq numbering is useful for distro kernels that want
44 to define a high CONFIG_NR_CPUS value but still want to have
45 low kernel memory footprint on smaller machines.
46
47 ( Sparse irqs can also be beneficial on NUMA boxes, as they spread
48 out the interrupt descriptors in a more NUMA-friendly way. )
49
50 If you don't know what to do here, say N.
51
52endmenu
53endif
diff --git a/kernel/irq/Makefile b/kernel/irq/Makefile
index 7d047808419d..54329cd7b3ee 100644
--- a/kernel/irq/Makefile
+++ b/kernel/irq/Makefile
@@ -1,7 +1,6 @@
1 1
2obj-y := handle.o manage.o spurious.o resend.o chip.o devres.o 2obj-y := irqdesc.o handle.o manage.o spurious.o resend.o chip.o dummychip.o devres.o
3obj-$(CONFIG_GENERIC_IRQ_PROBE) += autoprobe.o 3obj-$(CONFIG_GENERIC_IRQ_PROBE) += autoprobe.o
4obj-$(CONFIG_PROC_FS) += proc.o 4obj-$(CONFIG_PROC_FS) += proc.o
5obj-$(CONFIG_GENERIC_PENDING_IRQ) += migration.o 5obj-$(CONFIG_GENERIC_PENDING_IRQ) += migration.o
6obj-$(CONFIG_NUMA_IRQ_DESC) += numa_migrate.o
7obj-$(CONFIG_PM_SLEEP) += pm.o 6obj-$(CONFIG_PM_SLEEP) += pm.o
diff --git a/kernel/irq/autoprobe.c b/kernel/irq/autoprobe.c
index 2295a31ef110..505798f86c36 100644
--- a/kernel/irq/autoprobe.c
+++ b/kernel/irq/autoprobe.c
@@ -57,9 +57,10 @@ unsigned long probe_irq_on(void)
57 * Some chips need to know about probing in 57 * Some chips need to know about probing in
58 * progress: 58 * progress:
59 */ 59 */
60 if (desc->chip->set_type) 60 if (desc->irq_data.chip->irq_set_type)
61 desc->chip->set_type(i, IRQ_TYPE_PROBE); 61 desc->irq_data.chip->irq_set_type(&desc->irq_data,
62 desc->chip->startup(i); 62 IRQ_TYPE_PROBE);
63 desc->irq_data.chip->irq_startup(&desc->irq_data);
63 } 64 }
64 raw_spin_unlock_irq(&desc->lock); 65 raw_spin_unlock_irq(&desc->lock);
65 } 66 }
@@ -76,7 +77,7 @@ unsigned long probe_irq_on(void)
76 raw_spin_lock_irq(&desc->lock); 77 raw_spin_lock_irq(&desc->lock);
77 if (!desc->action && !(desc->status & IRQ_NOPROBE)) { 78 if (!desc->action && !(desc->status & IRQ_NOPROBE)) {
78 desc->status |= IRQ_AUTODETECT | IRQ_WAITING; 79 desc->status |= IRQ_AUTODETECT | IRQ_WAITING;
79 if (desc->chip->startup(i)) 80 if (desc->irq_data.chip->irq_startup(&desc->irq_data))
80 desc->status |= IRQ_PENDING; 81 desc->status |= IRQ_PENDING;
81 } 82 }
82 raw_spin_unlock_irq(&desc->lock); 83 raw_spin_unlock_irq(&desc->lock);
@@ -98,7 +99,7 @@ unsigned long probe_irq_on(void)
98 /* It triggered already - consider it spurious. */ 99 /* It triggered already - consider it spurious. */
99 if (!(status & IRQ_WAITING)) { 100 if (!(status & IRQ_WAITING)) {
100 desc->status = status & ~IRQ_AUTODETECT; 101 desc->status = status & ~IRQ_AUTODETECT;
101 desc->chip->shutdown(i); 102 desc->irq_data.chip->irq_shutdown(&desc->irq_data);
102 } else 103 } else
103 if (i < 32) 104 if (i < 32)
104 mask |= 1 << i; 105 mask |= 1 << i;
@@ -137,7 +138,7 @@ unsigned int probe_irq_mask(unsigned long val)
137 mask |= 1 << i; 138 mask |= 1 << i;
138 139
139 desc->status = status & ~IRQ_AUTODETECT; 140 desc->status = status & ~IRQ_AUTODETECT;
140 desc->chip->shutdown(i); 141 desc->irq_data.chip->irq_shutdown(&desc->irq_data);
141 } 142 }
142 raw_spin_unlock_irq(&desc->lock); 143 raw_spin_unlock_irq(&desc->lock);
143 } 144 }
@@ -181,7 +182,7 @@ int probe_irq_off(unsigned long val)
181 nr_of_irqs++; 182 nr_of_irqs++;
182 } 183 }
183 desc->status = status & ~IRQ_AUTODETECT; 184 desc->status = status & ~IRQ_AUTODETECT;
184 desc->chip->shutdown(i); 185 desc->irq_data.chip->irq_shutdown(&desc->irq_data);
185 } 186 }
186 raw_spin_unlock_irq(&desc->lock); 187 raw_spin_unlock_irq(&desc->lock);
187 } 188 }
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index b7091d5ca2f8..baa5c4acad83 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -18,108 +18,6 @@
18 18
19#include "internals.h" 19#include "internals.h"
20 20
21static void dynamic_irq_init_x(unsigned int irq, bool keep_chip_data)
22{
23 struct irq_desc *desc;
24 unsigned long flags;
25
26 desc = irq_to_desc(irq);
27 if (!desc) {
28 WARN(1, KERN_ERR "Trying to initialize invalid IRQ%d\n", irq);
29 return;
30 }
31
32 /* Ensure we don't have left over values from a previous use of this irq */
33 raw_spin_lock_irqsave(&desc->lock, flags);
34 desc->status = IRQ_DISABLED;
35 desc->chip = &no_irq_chip;
36 desc->handle_irq = handle_bad_irq;
37 desc->depth = 1;
38 desc->msi_desc = NULL;
39 desc->handler_data = NULL;
40 if (!keep_chip_data)
41 desc->chip_data = NULL;
42 desc->action = NULL;
43 desc->irq_count = 0;
44 desc->irqs_unhandled = 0;
45#ifdef CONFIG_SMP
46 cpumask_setall(desc->affinity);
47#ifdef CONFIG_GENERIC_PENDING_IRQ
48 cpumask_clear(desc->pending_mask);
49#endif
50#endif
51 raw_spin_unlock_irqrestore(&desc->lock, flags);
52}
53
54/**
55 * dynamic_irq_init - initialize a dynamically allocated irq
56 * @irq: irq number to initialize
57 */
58void dynamic_irq_init(unsigned int irq)
59{
60 dynamic_irq_init_x(irq, false);
61}
62
63/**
64 * dynamic_irq_init_keep_chip_data - initialize a dynamically allocated irq
65 * @irq: irq number to initialize
66 *
67 * does not set irq_to_desc(irq)->chip_data to NULL
68 */
69void dynamic_irq_init_keep_chip_data(unsigned int irq)
70{
71 dynamic_irq_init_x(irq, true);
72}
73
74static void dynamic_irq_cleanup_x(unsigned int irq, bool keep_chip_data)
75{
76 struct irq_desc *desc = irq_to_desc(irq);
77 unsigned long flags;
78
79 if (!desc) {
80 WARN(1, KERN_ERR "Trying to cleanup invalid IRQ%d\n", irq);
81 return;
82 }
83
84 raw_spin_lock_irqsave(&desc->lock, flags);
85 if (desc->action) {
86 raw_spin_unlock_irqrestore(&desc->lock, flags);
87 WARN(1, KERN_ERR "Destroying IRQ%d without calling free_irq\n",
88 irq);
89 return;
90 }
91 desc->msi_desc = NULL;
92 desc->handler_data = NULL;
93 if (!keep_chip_data)
94 desc->chip_data = NULL;
95 desc->handle_irq = handle_bad_irq;
96 desc->chip = &no_irq_chip;
97 desc->name = NULL;
98 clear_kstat_irqs(desc);
99 raw_spin_unlock_irqrestore(&desc->lock, flags);
100}
101
102/**
103 * dynamic_irq_cleanup - cleanup a dynamically allocated irq
104 * @irq: irq number to initialize
105 */
106void dynamic_irq_cleanup(unsigned int irq)
107{
108 dynamic_irq_cleanup_x(irq, false);
109}
110
111/**
112 * dynamic_irq_cleanup_keep_chip_data - cleanup a dynamically allocated irq
113 * @irq: irq number to initialize
114 *
115 * does not set irq_to_desc(irq)->chip_data to NULL
116 */
117void dynamic_irq_cleanup_keep_chip_data(unsigned int irq)
118{
119 dynamic_irq_cleanup_x(irq, true);
120}
121
122
123/** 21/**
124 * set_irq_chip - set the irq chip for an irq 22 * set_irq_chip - set the irq chip for an irq
125 * @irq: irq number 23 * @irq: irq number
@@ -140,7 +38,7 @@ int set_irq_chip(unsigned int irq, struct irq_chip *chip)
140 38
141 raw_spin_lock_irqsave(&desc->lock, flags); 39 raw_spin_lock_irqsave(&desc->lock, flags);
142 irq_chip_set_defaults(chip); 40 irq_chip_set_defaults(chip);
143 desc->chip = chip; 41 desc->irq_data.chip = chip;
144 raw_spin_unlock_irqrestore(&desc->lock, flags); 42 raw_spin_unlock_irqrestore(&desc->lock, flags);
145 43
146 return 0; 44 return 0;
@@ -193,7 +91,7 @@ int set_irq_data(unsigned int irq, void *data)
193 } 91 }
194 92
195 raw_spin_lock_irqsave(&desc->lock, flags); 93 raw_spin_lock_irqsave(&desc->lock, flags);
196 desc->handler_data = data; 94 desc->irq_data.handler_data = data;
197 raw_spin_unlock_irqrestore(&desc->lock, flags); 95 raw_spin_unlock_irqrestore(&desc->lock, flags);
198 return 0; 96 return 0;
199} 97}
@@ -218,7 +116,7 @@ int set_irq_msi(unsigned int irq, struct msi_desc *entry)
218 } 116 }
219 117
220 raw_spin_lock_irqsave(&desc->lock, flags); 118 raw_spin_lock_irqsave(&desc->lock, flags);
221 desc->msi_desc = entry; 119 desc->irq_data.msi_desc = entry;
222 if (entry) 120 if (entry)
223 entry->irq = irq; 121 entry->irq = irq;
224 raw_spin_unlock_irqrestore(&desc->lock, flags); 122 raw_spin_unlock_irqrestore(&desc->lock, flags);
@@ -243,19 +141,27 @@ int set_irq_chip_data(unsigned int irq, void *data)
243 return -EINVAL; 141 return -EINVAL;
244 } 142 }
245 143
246 if (!desc->chip) { 144 if (!desc->irq_data.chip) {
247 printk(KERN_ERR "BUG: bad set_irq_chip_data(IRQ#%d)\n", irq); 145 printk(KERN_ERR "BUG: bad set_irq_chip_data(IRQ#%d)\n", irq);
248 return -EINVAL; 146 return -EINVAL;
249 } 147 }
250 148
251 raw_spin_lock_irqsave(&desc->lock, flags); 149 raw_spin_lock_irqsave(&desc->lock, flags);
252 desc->chip_data = data; 150 desc->irq_data.chip_data = data;
253 raw_spin_unlock_irqrestore(&desc->lock, flags); 151 raw_spin_unlock_irqrestore(&desc->lock, flags);
254 152
255 return 0; 153 return 0;
256} 154}
257EXPORT_SYMBOL(set_irq_chip_data); 155EXPORT_SYMBOL(set_irq_chip_data);
258 156
157struct irq_data *irq_get_irq_data(unsigned int irq)
158{
159 struct irq_desc *desc = irq_to_desc(irq);
160
161 return desc ? &desc->irq_data : NULL;
162}
163EXPORT_SYMBOL_GPL(irq_get_irq_data);
164
259/** 165/**
260 * set_irq_nested_thread - Set/Reset the IRQ_NESTED_THREAD flag of an irq 166 * set_irq_nested_thread - Set/Reset the IRQ_NESTED_THREAD flag of an irq
261 * 167 *
@@ -287,93 +193,216 @@ EXPORT_SYMBOL_GPL(set_irq_nested_thread);
287/* 193/*
288 * default enable function 194 * default enable function
289 */ 195 */
290static void default_enable(unsigned int irq) 196static void default_enable(struct irq_data *data)
291{ 197{
292 struct irq_desc *desc = irq_to_desc(irq); 198 struct irq_desc *desc = irq_data_to_desc(data);
293 199
294 desc->chip->unmask(irq); 200 desc->irq_data.chip->irq_unmask(&desc->irq_data);
295 desc->status &= ~IRQ_MASKED; 201 desc->status &= ~IRQ_MASKED;
296} 202}
297 203
298/* 204/*
299 * default disable function 205 * default disable function
300 */ 206 */
301static void default_disable(unsigned int irq) 207static void default_disable(struct irq_data *data)
302{ 208{
303} 209}
304 210
305/* 211/*
306 * default startup function 212 * default startup function
307 */ 213 */
308static unsigned int default_startup(unsigned int irq) 214static unsigned int default_startup(struct irq_data *data)
309{ 215{
310 struct irq_desc *desc = irq_to_desc(irq); 216 struct irq_desc *desc = irq_data_to_desc(data);
311 217
312 desc->chip->enable(irq); 218 desc->irq_data.chip->irq_enable(data);
313 return 0; 219 return 0;
314} 220}
315 221
316/* 222/*
317 * default shutdown function 223 * default shutdown function
318 */ 224 */
319static void default_shutdown(unsigned int irq) 225static void default_shutdown(struct irq_data *data)
320{ 226{
321 struct irq_desc *desc = irq_to_desc(irq); 227 struct irq_desc *desc = irq_data_to_desc(data);
322 228
323 desc->chip->mask(irq); 229 desc->irq_data.chip->irq_mask(&desc->irq_data);
324 desc->status |= IRQ_MASKED; 230 desc->status |= IRQ_MASKED;
325} 231}
326 232
233#ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
234/* Temporary migration helpers */
235static void compat_irq_mask(struct irq_data *data)
236{
237 data->chip->mask(data->irq);
238}
239
240static void compat_irq_unmask(struct irq_data *data)
241{
242 data->chip->unmask(data->irq);
243}
244
245static void compat_irq_ack(struct irq_data *data)
246{
247 data->chip->ack(data->irq);
248}
249
250static void compat_irq_mask_ack(struct irq_data *data)
251{
252 data->chip->mask_ack(data->irq);
253}
254
255static void compat_irq_eoi(struct irq_data *data)
256{
257 data->chip->eoi(data->irq);
258}
259
260static void compat_irq_enable(struct irq_data *data)
261{
262 data->chip->enable(data->irq);
263}
264
265static void compat_irq_disable(struct irq_data *data)
266{
267 data->chip->disable(data->irq);
268}
269
270static void compat_irq_shutdown(struct irq_data *data)
271{
272 data->chip->shutdown(data->irq);
273}
274
275static unsigned int compat_irq_startup(struct irq_data *data)
276{
277 return data->chip->startup(data->irq);
278}
279
280static int compat_irq_set_affinity(struct irq_data *data,
281 const struct cpumask *dest, bool force)
282{
283 return data->chip->set_affinity(data->irq, dest);
284}
285
286static int compat_irq_set_type(struct irq_data *data, unsigned int type)
287{
288 return data->chip->set_type(data->irq, type);
289}
290
291static int compat_irq_set_wake(struct irq_data *data, unsigned int on)
292{
293 return data->chip->set_wake(data->irq, on);
294}
295
296static int compat_irq_retrigger(struct irq_data *data)
297{
298 return data->chip->retrigger(data->irq);
299}
300
301static void compat_bus_lock(struct irq_data *data)
302{
303 data->chip->bus_lock(data->irq);
304}
305
306static void compat_bus_sync_unlock(struct irq_data *data)
307{
308 data->chip->bus_sync_unlock(data->irq);
309}
310#endif
311
327/* 312/*
328 * Fixup enable/disable function pointers 313 * Fixup enable/disable function pointers
329 */ 314 */
330void irq_chip_set_defaults(struct irq_chip *chip) 315void irq_chip_set_defaults(struct irq_chip *chip)
331{ 316{
332 if (!chip->enable) 317#ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
333 chip->enable = default_enable;
334 if (!chip->disable)
335 chip->disable = default_disable;
336 if (!chip->startup)
337 chip->startup = default_startup;
338 /* 318 /*
339 * We use chip->disable, when the user provided its own. When 319 * Compat fixup functions need to be before we set the
340 * we have default_disable set for chip->disable, then we need 320 * defaults for enable/disable/startup/shutdown
321 */
322 if (chip->enable)
323 chip->irq_enable = compat_irq_enable;
324 if (chip->disable)
325 chip->irq_disable = compat_irq_disable;
326 if (chip->shutdown)
327 chip->irq_shutdown = compat_irq_shutdown;
328 if (chip->startup)
329 chip->irq_startup = compat_irq_startup;
330#endif
331 /*
332 * The real defaults
333 */
334 if (!chip->irq_enable)
335 chip->irq_enable = default_enable;
336 if (!chip->irq_disable)
337 chip->irq_disable = default_disable;
338 if (!chip->irq_startup)
339 chip->irq_startup = default_startup;
340 /*
341 * We use chip->irq_disable, when the user provided its own. When
342 * we have default_disable set for chip->irq_disable, then we need
341 * to use default_shutdown, otherwise the irq line is not 343 * to use default_shutdown, otherwise the irq line is not
342 * disabled on free_irq(): 344 * disabled on free_irq():
343 */ 345 */
344 if (!chip->shutdown) 346 if (!chip->irq_shutdown)
345 chip->shutdown = chip->disable != default_disable ? 347 chip->irq_shutdown = chip->irq_disable != default_disable ?
346 chip->disable : default_shutdown; 348 chip->irq_disable : default_shutdown;
347 if (!chip->name) 349
348 chip->name = chip->typename; 350#ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
349 if (!chip->end) 351 if (!chip->end)
350 chip->end = dummy_irq_chip.end; 352 chip->end = dummy_irq_chip.end;
353
354 /*
355 * Now fix up the remaining compat handlers
356 */
357 if (chip->bus_lock)
358 chip->irq_bus_lock = compat_bus_lock;
359 if (chip->bus_sync_unlock)
360 chip->irq_bus_sync_unlock = compat_bus_sync_unlock;
361 if (chip->mask)
362 chip->irq_mask = compat_irq_mask;
363 if (chip->unmask)
364 chip->irq_unmask = compat_irq_unmask;
365 if (chip->ack)
366 chip->irq_ack = compat_irq_ack;
367 if (chip->mask_ack)
368 chip->irq_mask_ack = compat_irq_mask_ack;
369 if (chip->eoi)
370 chip->irq_eoi = compat_irq_eoi;
371 if (chip->set_affinity)
372 chip->irq_set_affinity = compat_irq_set_affinity;
373 if (chip->set_type)
374 chip->irq_set_type = compat_irq_set_type;
375 if (chip->set_wake)
376 chip->irq_set_wake = compat_irq_set_wake;
377 if (chip->retrigger)
378 chip->irq_retrigger = compat_irq_retrigger;
379#endif
351} 380}
352 381
353static inline void mask_ack_irq(struct irq_desc *desc, int irq) 382static inline void mask_ack_irq(struct irq_desc *desc)
354{ 383{
355 if (desc->chip->mask_ack) 384 if (desc->irq_data.chip->irq_mask_ack)
356 desc->chip->mask_ack(irq); 385 desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
357 else { 386 else {
358 desc->chip->mask(irq); 387 desc->irq_data.chip->irq_mask(&desc->irq_data);
359 if (desc->chip->ack) 388 if (desc->irq_data.chip->irq_ack)
360 desc->chip->ack(irq); 389 desc->irq_data.chip->irq_ack(&desc->irq_data);
361 } 390 }
362 desc->status |= IRQ_MASKED; 391 desc->status |= IRQ_MASKED;
363} 392}
364 393
365static inline void mask_irq(struct irq_desc *desc, int irq) 394static inline void mask_irq(struct irq_desc *desc)
366{ 395{
367 if (desc->chip->mask) { 396 if (desc->irq_data.chip->irq_mask) {
368 desc->chip->mask(irq); 397 desc->irq_data.chip->irq_mask(&desc->irq_data);
369 desc->status |= IRQ_MASKED; 398 desc->status |= IRQ_MASKED;
370 } 399 }
371} 400}
372 401
373static inline void unmask_irq(struct irq_desc *desc, int irq) 402static inline void unmask_irq(struct irq_desc *desc)
374{ 403{
375 if (desc->chip->unmask) { 404 if (desc->irq_data.chip->irq_unmask) {
376 desc->chip->unmask(irq); 405 desc->irq_data.chip->irq_unmask(&desc->irq_data);
377 desc->status &= ~IRQ_MASKED; 406 desc->status &= ~IRQ_MASKED;
378 } 407 }
379} 408}
@@ -476,7 +505,7 @@ handle_level_irq(unsigned int irq, struct irq_desc *desc)
476 irqreturn_t action_ret; 505 irqreturn_t action_ret;
477 506
478 raw_spin_lock(&desc->lock); 507 raw_spin_lock(&desc->lock);
479 mask_ack_irq(desc, irq); 508 mask_ack_irq(desc);
480 509
481 if (unlikely(desc->status & IRQ_INPROGRESS)) 510 if (unlikely(desc->status & IRQ_INPROGRESS))
482 goto out_unlock; 511 goto out_unlock;
@@ -502,7 +531,7 @@ handle_level_irq(unsigned int irq, struct irq_desc *desc)
502 desc->status &= ~IRQ_INPROGRESS; 531 desc->status &= ~IRQ_INPROGRESS;
503 532
504 if (!(desc->status & (IRQ_DISABLED | IRQ_ONESHOT))) 533 if (!(desc->status & (IRQ_DISABLED | IRQ_ONESHOT)))
505 unmask_irq(desc, irq); 534 unmask_irq(desc);
506out_unlock: 535out_unlock:
507 raw_spin_unlock(&desc->lock); 536 raw_spin_unlock(&desc->lock);
508} 537}
@@ -539,7 +568,7 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
539 action = desc->action; 568 action = desc->action;
540 if (unlikely(!action || (desc->status & IRQ_DISABLED))) { 569 if (unlikely(!action || (desc->status & IRQ_DISABLED))) {
541 desc->status |= IRQ_PENDING; 570 desc->status |= IRQ_PENDING;
542 mask_irq(desc, irq); 571 mask_irq(desc);
543 goto out; 572 goto out;
544 } 573 }
545 574
@@ -554,7 +583,7 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
554 raw_spin_lock(&desc->lock); 583 raw_spin_lock(&desc->lock);
555 desc->status &= ~IRQ_INPROGRESS; 584 desc->status &= ~IRQ_INPROGRESS;
556out: 585out:
557 desc->chip->eoi(irq); 586 desc->irq_data.chip->irq_eoi(&desc->irq_data);
558 587
559 raw_spin_unlock(&desc->lock); 588 raw_spin_unlock(&desc->lock);
560} 589}
@@ -590,14 +619,13 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc)
590 if (unlikely((desc->status & (IRQ_INPROGRESS | IRQ_DISABLED)) || 619 if (unlikely((desc->status & (IRQ_INPROGRESS | IRQ_DISABLED)) ||
591 !desc->action)) { 620 !desc->action)) {
592 desc->status |= (IRQ_PENDING | IRQ_MASKED); 621 desc->status |= (IRQ_PENDING | IRQ_MASKED);
593 mask_ack_irq(desc, irq); 622 mask_ack_irq(desc);
594 goto out_unlock; 623 goto out_unlock;
595 } 624 }
596 kstat_incr_irqs_this_cpu(irq, desc); 625 kstat_incr_irqs_this_cpu(irq, desc);
597 626
598 /* Start handling the irq */ 627 /* Start handling the irq */
599 if (desc->chip->ack) 628 desc->irq_data.chip->irq_ack(&desc->irq_data);
600 desc->chip->ack(irq);
601 629
602 /* Mark the IRQ currently in progress.*/ 630 /* Mark the IRQ currently in progress.*/
603 desc->status |= IRQ_INPROGRESS; 631 desc->status |= IRQ_INPROGRESS;
@@ -607,7 +635,7 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc)
607 irqreturn_t action_ret; 635 irqreturn_t action_ret;
608 636
609 if (unlikely(!action)) { 637 if (unlikely(!action)) {
610 mask_irq(desc, irq); 638 mask_irq(desc);
611 goto out_unlock; 639 goto out_unlock;
612 } 640 }
613 641
@@ -619,7 +647,7 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc)
619 if (unlikely((desc->status & 647 if (unlikely((desc->status &
620 (IRQ_PENDING | IRQ_MASKED | IRQ_DISABLED)) == 648 (IRQ_PENDING | IRQ_MASKED | IRQ_DISABLED)) ==
621 (IRQ_PENDING | IRQ_MASKED))) { 649 (IRQ_PENDING | IRQ_MASKED))) {
622 unmask_irq(desc, irq); 650 unmask_irq(desc);
623 } 651 }
624 652
625 desc->status &= ~IRQ_PENDING; 653 desc->status &= ~IRQ_PENDING;
@@ -650,15 +678,15 @@ handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
650 678
651 kstat_incr_irqs_this_cpu(irq, desc); 679 kstat_incr_irqs_this_cpu(irq, desc);
652 680
653 if (desc->chip->ack) 681 if (desc->irq_data.chip->irq_ack)
654 desc->chip->ack(irq); 682 desc->irq_data.chip->irq_ack(&desc->irq_data);
655 683
656 action_ret = handle_IRQ_event(irq, desc->action); 684 action_ret = handle_IRQ_event(irq, desc->action);
657 if (!noirqdebug) 685 if (!noirqdebug)
658 note_interrupt(irq, desc, action_ret); 686 note_interrupt(irq, desc, action_ret);
659 687
660 if (desc->chip->eoi) 688 if (desc->irq_data.chip->irq_eoi)
661 desc->chip->eoi(irq); 689 desc->irq_data.chip->irq_eoi(&desc->irq_data);
662} 690}
663 691
664void 692void
@@ -676,7 +704,7 @@ __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
676 704
677 if (!handle) 705 if (!handle)
678 handle = handle_bad_irq; 706 handle = handle_bad_irq;
679 else if (desc->chip == &no_irq_chip) { 707 else if (desc->irq_data.chip == &no_irq_chip) {
680 printk(KERN_WARNING "Trying to install %sinterrupt handler " 708 printk(KERN_WARNING "Trying to install %sinterrupt handler "
681 "for IRQ%d\n", is_chained ? "chained " : "", irq); 709 "for IRQ%d\n", is_chained ? "chained " : "", irq);
682 /* 710 /*
@@ -686,16 +714,16 @@ __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
686 * prevent us to setup the interrupt at all. Switch it to 714 * prevent us to setup the interrupt at all. Switch it to
687 * dummy_irq_chip for easy transition. 715 * dummy_irq_chip for easy transition.
688 */ 716 */
689 desc->chip = &dummy_irq_chip; 717 desc->irq_data.chip = &dummy_irq_chip;
690 } 718 }
691 719
692 chip_bus_lock(irq, desc); 720 chip_bus_lock(desc);
693 raw_spin_lock_irqsave(&desc->lock, flags); 721 raw_spin_lock_irqsave(&desc->lock, flags);
694 722
695 /* Uninstall? */ 723 /* Uninstall? */
696 if (handle == handle_bad_irq) { 724 if (handle == handle_bad_irq) {
697 if (desc->chip != &no_irq_chip) 725 if (desc->irq_data.chip != &no_irq_chip)
698 mask_ack_irq(desc, irq); 726 mask_ack_irq(desc);
699 desc->status |= IRQ_DISABLED; 727 desc->status |= IRQ_DISABLED;
700 desc->depth = 1; 728 desc->depth = 1;
701 } 729 }
@@ -706,10 +734,10 @@ __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
706 desc->status &= ~IRQ_DISABLED; 734 desc->status &= ~IRQ_DISABLED;
707 desc->status |= IRQ_NOREQUEST | IRQ_NOPROBE; 735 desc->status |= IRQ_NOREQUEST | IRQ_NOPROBE;
708 desc->depth = 0; 736 desc->depth = 0;
709 desc->chip->startup(irq); 737 desc->irq_data.chip->irq_startup(&desc->irq_data);
710 } 738 }
711 raw_spin_unlock_irqrestore(&desc->lock, flags); 739 raw_spin_unlock_irqrestore(&desc->lock, flags);
712 chip_bus_sync_unlock(irq, desc); 740 chip_bus_sync_unlock(desc);
713} 741}
714EXPORT_SYMBOL_GPL(__set_irq_handler); 742EXPORT_SYMBOL_GPL(__set_irq_handler);
715 743
@@ -729,32 +757,20 @@ set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
729 __set_irq_handler(irq, handle, 0, name); 757 __set_irq_handler(irq, handle, 0, name);
730} 758}
731 759
732void set_irq_noprobe(unsigned int irq) 760void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
733{ 761{
734 struct irq_desc *desc = irq_to_desc(irq); 762 struct irq_desc *desc = irq_to_desc(irq);
735 unsigned long flags; 763 unsigned long flags;
736 764
737 if (!desc) { 765 if (!desc)
738 printk(KERN_ERR "Trying to mark IRQ%d non-probeable\n", irq);
739 return; 766 return;
740 }
741
742 raw_spin_lock_irqsave(&desc->lock, flags);
743 desc->status |= IRQ_NOPROBE;
744 raw_spin_unlock_irqrestore(&desc->lock, flags);
745}
746
747void set_irq_probe(unsigned int irq)
748{
749 struct irq_desc *desc = irq_to_desc(irq);
750 unsigned long flags;
751 767
752 if (!desc) { 768 /* Sanitize flags */
753 printk(KERN_ERR "Trying to mark IRQ%d probeable\n", irq); 769 set &= IRQF_MODIFY_MASK;
754 return; 770 clr &= IRQF_MODIFY_MASK;
755 }
756 771
757 raw_spin_lock_irqsave(&desc->lock, flags); 772 raw_spin_lock_irqsave(&desc->lock, flags);
758 desc->status &= ~IRQ_NOPROBE; 773 desc->status &= ~clr;
774 desc->status |= set;
759 raw_spin_unlock_irqrestore(&desc->lock, flags); 775 raw_spin_unlock_irqrestore(&desc->lock, flags);
760} 776}
diff --git a/kernel/irq/dummychip.c b/kernel/irq/dummychip.c
new file mode 100644
index 000000000000..20dc5474947e
--- /dev/null
+++ b/kernel/irq/dummychip.c
@@ -0,0 +1,68 @@
1/*
2 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
3 * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
4 *
5 * This file contains the dummy interrupt chip implementation
6 */
7#include <linux/interrupt.h>
8#include <linux/irq.h>
9
10#include "internals.h"
11
12/*
13 * What should we do if we get a hw irq event on an illegal vector?
14 * Each architecture has to answer this themself.
15 */
16static void ack_bad(struct irq_data *data)
17{
18 struct irq_desc *desc = irq_data_to_desc(data);
19
20 print_irq_desc(data->irq, desc);
21 ack_bad_irq(data->irq);
22}
23
24/*
25 * NOP functions
26 */
27static void noop(struct irq_data *data) { }
28
29static unsigned int noop_ret(struct irq_data *data)
30{
31 return 0;
32}
33
34#ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
35static void compat_noop(unsigned int irq) { }
36#define END_INIT .end = compat_noop
37#else
38#define END_INIT
39#endif
40
41/*
42 * Generic no controller implementation
43 */
44struct irq_chip no_irq_chip = {
45 .name = "none",
46 .irq_startup = noop_ret,
47 .irq_shutdown = noop,
48 .irq_enable = noop,
49 .irq_disable = noop,
50 .irq_ack = ack_bad,
51 END_INIT
52};
53
54/*
55 * Generic dummy implementation which can be used for
56 * real dumb interrupt sources
57 */
58struct irq_chip dummy_irq_chip = {
59 .name = "dummy",
60 .irq_startup = noop_ret,
61 .irq_shutdown = noop,
62 .irq_enable = noop,
63 .irq_disable = noop,
64 .irq_ack = noop,
65 .irq_mask = noop,
66 .irq_unmask = noop,
67 END_INIT
68};
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 27e5c6911223..e2347eb63306 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -11,24 +11,15 @@
11 */ 11 */
12 12
13#include <linux/irq.h> 13#include <linux/irq.h>
14#include <linux/sched.h>
15#include <linux/slab.h>
16#include <linux/module.h>
17#include <linux/random.h> 14#include <linux/random.h>
15#include <linux/sched.h>
18#include <linux/interrupt.h> 16#include <linux/interrupt.h>
19#include <linux/kernel_stat.h> 17#include <linux/kernel_stat.h>
20#include <linux/rculist.h> 18
21#include <linux/hash.h>
22#include <linux/radix-tree.h>
23#include <trace/events/irq.h> 19#include <trace/events/irq.h>
24 20
25#include "internals.h" 21#include "internals.h"
26 22
27/*
28 * lockdep: we want to handle all irq_desc locks as a single lock-class:
29 */
30struct lock_class_key irq_desc_lock_class;
31
32/** 23/**
33 * handle_bad_irq - handle spurious and unhandled irqs 24 * handle_bad_irq - handle spurious and unhandled irqs
34 * @irq: the interrupt number 25 * @irq: the interrupt number
@@ -43,304 +34,6 @@ void handle_bad_irq(unsigned int irq, struct irq_desc *desc)
43 ack_bad_irq(irq); 34 ack_bad_irq(irq);
44} 35}
45 36
46#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
47static void __init init_irq_default_affinity(void)
48{
49 alloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT);
50 cpumask_setall(irq_default_affinity);
51}
52#else
53static void __init init_irq_default_affinity(void)
54{
55}
56#endif
57
58/*
59 * Linux has a controller-independent interrupt architecture.
60 * Every controller has a 'controller-template', that is used
61 * by the main code to do the right thing. Each driver-visible
62 * interrupt source is transparently wired to the appropriate
63 * controller. Thus drivers need not be aware of the
64 * interrupt-controller.
65 *
66 * The code is designed to be easily extended with new/different
67 * interrupt controllers, without having to do assembly magic or
68 * having to touch the generic code.
69 *
70 * Controller mappings for all interrupt sources:
71 */
72int nr_irqs = NR_IRQS;
73EXPORT_SYMBOL_GPL(nr_irqs);
74
75#ifdef CONFIG_SPARSE_IRQ
76
77static struct irq_desc irq_desc_init = {
78 .irq = -1,
79 .status = IRQ_DISABLED,
80 .chip = &no_irq_chip,
81 .handle_irq = handle_bad_irq,
82 .depth = 1,
83 .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
84};
85
86void __ref init_kstat_irqs(struct irq_desc *desc, int node, int nr)
87{
88 void *ptr;
89
90 ptr = kzalloc_node(nr * sizeof(*desc->kstat_irqs),
91 GFP_ATOMIC, node);
92
93 /*
94 * don't overwite if can not get new one
95 * init_copy_kstat_irqs() could still use old one
96 */
97 if (ptr) {
98 printk(KERN_DEBUG " alloc kstat_irqs on node %d\n", node);
99 desc->kstat_irqs = ptr;
100 }
101}
102
103static void init_one_irq_desc(int irq, struct irq_desc *desc, int node)
104{
105 memcpy(desc, &irq_desc_init, sizeof(struct irq_desc));
106
107 raw_spin_lock_init(&desc->lock);
108 desc->irq = irq;
109#ifdef CONFIG_SMP
110 desc->node = node;
111#endif
112 lockdep_set_class(&desc->lock, &irq_desc_lock_class);
113 init_kstat_irqs(desc, node, nr_cpu_ids);
114 if (!desc->kstat_irqs) {
115 printk(KERN_ERR "can not alloc kstat_irqs\n");
116 BUG_ON(1);
117 }
118 if (!alloc_desc_masks(desc, node, false)) {
119 printk(KERN_ERR "can not alloc irq_desc cpumasks\n");
120 BUG_ON(1);
121 }
122 init_desc_masks(desc);
123 arch_init_chip_data(desc, node);
124}
125
126/*
127 * Protect the sparse_irqs:
128 */
129DEFINE_RAW_SPINLOCK(sparse_irq_lock);
130
131static RADIX_TREE(irq_desc_tree, GFP_ATOMIC);
132
133static void set_irq_desc(unsigned int irq, struct irq_desc *desc)
134{
135 radix_tree_insert(&irq_desc_tree, irq, desc);
136}
137
138struct irq_desc *irq_to_desc(unsigned int irq)
139{
140 return radix_tree_lookup(&irq_desc_tree, irq);
141}
142
143void replace_irq_desc(unsigned int irq, struct irq_desc *desc)
144{
145 void **ptr;
146
147 ptr = radix_tree_lookup_slot(&irq_desc_tree, irq);
148 if (ptr)
149 radix_tree_replace_slot(ptr, desc);
150}
151
152static struct irq_desc irq_desc_legacy[NR_IRQS_LEGACY] __cacheline_aligned_in_smp = {
153 [0 ... NR_IRQS_LEGACY-1] = {
154 .irq = -1,
155 .status = IRQ_DISABLED,
156 .chip = &no_irq_chip,
157 .handle_irq = handle_bad_irq,
158 .depth = 1,
159 .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
160 }
161};
162
163static unsigned int *kstat_irqs_legacy;
164
165int __init early_irq_init(void)
166{
167 struct irq_desc *desc;
168 int legacy_count;
169 int node;
170 int i;
171
172 init_irq_default_affinity();
173
174 /* initialize nr_irqs based on nr_cpu_ids */
175 arch_probe_nr_irqs();
176 printk(KERN_INFO "NR_IRQS:%d nr_irqs:%d\n", NR_IRQS, nr_irqs);
177
178 desc = irq_desc_legacy;
179 legacy_count = ARRAY_SIZE(irq_desc_legacy);
180 node = first_online_node;
181
182 /* allocate based on nr_cpu_ids */
183 kstat_irqs_legacy = kzalloc_node(NR_IRQS_LEGACY * nr_cpu_ids *
184 sizeof(int), GFP_NOWAIT, node);
185
186 for (i = 0; i < legacy_count; i++) {
187 desc[i].irq = i;
188#ifdef CONFIG_SMP
189 desc[i].node = node;
190#endif
191 desc[i].kstat_irqs = kstat_irqs_legacy + i * nr_cpu_ids;
192 lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
193 alloc_desc_masks(&desc[i], node, true);
194 init_desc_masks(&desc[i]);
195 set_irq_desc(i, &desc[i]);
196 }
197
198 return arch_early_irq_init();
199}
200
201struct irq_desc * __ref irq_to_desc_alloc_node(unsigned int irq, int node)
202{
203 struct irq_desc *desc;
204 unsigned long flags;
205
206 if (irq >= nr_irqs) {
207 WARN(1, "irq (%d) >= nr_irqs (%d) in irq_to_desc_alloc\n",
208 irq, nr_irqs);
209 return NULL;
210 }
211
212 desc = irq_to_desc(irq);
213 if (desc)
214 return desc;
215
216 raw_spin_lock_irqsave(&sparse_irq_lock, flags);
217
218 /* We have to check it to avoid races with another CPU */
219 desc = irq_to_desc(irq);
220 if (desc)
221 goto out_unlock;
222
223 desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
224
225 printk(KERN_DEBUG " alloc irq_desc for %d on node %d\n", irq, node);
226 if (!desc) {
227 printk(KERN_ERR "can not alloc irq_desc\n");
228 BUG_ON(1);
229 }
230 init_one_irq_desc(irq, desc, node);
231
232 set_irq_desc(irq, desc);
233
234out_unlock:
235 raw_spin_unlock_irqrestore(&sparse_irq_lock, flags);
236
237 return desc;
238}
239
240#else /* !CONFIG_SPARSE_IRQ */
241
242struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
243 [0 ... NR_IRQS-1] = {
244 .status = IRQ_DISABLED,
245 .chip = &no_irq_chip,
246 .handle_irq = handle_bad_irq,
247 .depth = 1,
248 .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
249 }
250};
251
252static unsigned int kstat_irqs_all[NR_IRQS][NR_CPUS];
253int __init early_irq_init(void)
254{
255 struct irq_desc *desc;
256 int count;
257 int i;
258
259 init_irq_default_affinity();
260
261 printk(KERN_INFO "NR_IRQS:%d\n", NR_IRQS);
262
263 desc = irq_desc;
264 count = ARRAY_SIZE(irq_desc);
265
266 for (i = 0; i < count; i++) {
267 desc[i].irq = i;
268 alloc_desc_masks(&desc[i], 0, true);
269 init_desc_masks(&desc[i]);
270 desc[i].kstat_irqs = kstat_irqs_all[i];
271 }
272 return arch_early_irq_init();
273}
274
275struct irq_desc *irq_to_desc(unsigned int irq)
276{
277 return (irq < NR_IRQS) ? irq_desc + irq : NULL;
278}
279
280struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node)
281{
282 return irq_to_desc(irq);
283}
284#endif /* !CONFIG_SPARSE_IRQ */
285
286void clear_kstat_irqs(struct irq_desc *desc)
287{
288 memset(desc->kstat_irqs, 0, nr_cpu_ids * sizeof(*(desc->kstat_irqs)));
289}
290
291/*
292 * What should we do if we get a hw irq event on an illegal vector?
293 * Each architecture has to answer this themself.
294 */
295static void ack_bad(unsigned int irq)
296{
297 struct irq_desc *desc = irq_to_desc(irq);
298
299 print_irq_desc(irq, desc);
300 ack_bad_irq(irq);
301}
302
303/*
304 * NOP functions
305 */
306static void noop(unsigned int irq)
307{
308}
309
310static unsigned int noop_ret(unsigned int irq)
311{
312 return 0;
313}
314
315/*
316 * Generic no controller implementation
317 */
318struct irq_chip no_irq_chip = {
319 .name = "none",
320 .startup = noop_ret,
321 .shutdown = noop,
322 .enable = noop,
323 .disable = noop,
324 .ack = ack_bad,
325 .end = noop,
326};
327
328/*
329 * Generic dummy implementation which can be used for
330 * real dumb interrupt sources
331 */
332struct irq_chip dummy_irq_chip = {
333 .name = "dummy",
334 .startup = noop_ret,
335 .shutdown = noop,
336 .enable = noop,
337 .disable = noop,
338 .ack = noop,
339 .mask = noop,
340 .unmask = noop,
341 .end = noop,
342};
343
344/* 37/*
345 * Special, empty irq handler: 38 * Special, empty irq handler:
346 */ 39 */
@@ -457,20 +150,20 @@ unsigned int __do_IRQ(unsigned int irq)
457 /* 150 /*
458 * No locking required for CPU-local interrupts: 151 * No locking required for CPU-local interrupts:
459 */ 152 */
460 if (desc->chip->ack) 153 if (desc->irq_data.chip->ack)
461 desc->chip->ack(irq); 154 desc->irq_data.chip->ack(irq);
462 if (likely(!(desc->status & IRQ_DISABLED))) { 155 if (likely(!(desc->status & IRQ_DISABLED))) {
463 action_ret = handle_IRQ_event(irq, desc->action); 156 action_ret = handle_IRQ_event(irq, desc->action);
464 if (!noirqdebug) 157 if (!noirqdebug)
465 note_interrupt(irq, desc, action_ret); 158 note_interrupt(irq, desc, action_ret);
466 } 159 }
467 desc->chip->end(irq); 160 desc->irq_data.chip->end(irq);
468 return 1; 161 return 1;
469 } 162 }
470 163
471 raw_spin_lock(&desc->lock); 164 raw_spin_lock(&desc->lock);
472 if (desc->chip->ack) 165 if (desc->irq_data.chip->ack)
473 desc->chip->ack(irq); 166 desc->irq_data.chip->ack(irq);
474 /* 167 /*
475 * REPLAY is when Linux resends an IRQ that was dropped earlier 168 * REPLAY is when Linux resends an IRQ that was dropped earlier
476 * WAITING is used by probe to mark irqs that are being tested 169 * WAITING is used by probe to mark irqs that are being tested
@@ -530,27 +223,9 @@ out:
530 * The ->end() handler has to deal with interrupts which got 223 * The ->end() handler has to deal with interrupts which got
531 * disabled while the handler was running. 224 * disabled while the handler was running.
532 */ 225 */
533 desc->chip->end(irq); 226 desc->irq_data.chip->end(irq);
534 raw_spin_unlock(&desc->lock); 227 raw_spin_unlock(&desc->lock);
535 228
536 return 1; 229 return 1;
537} 230}
538#endif 231#endif
539
540void early_init_irq_lock_class(void)
541{
542 struct irq_desc *desc;
543 int i;
544
545 for_each_irq_desc(i, desc) {
546 lockdep_set_class(&desc->lock, &irq_desc_lock_class);
547 }
548}
549
550unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
551{
552 struct irq_desc *desc = irq_to_desc(irq);
553 return desc ? desc->kstat_irqs[cpu] : 0;
554}
555EXPORT_SYMBOL(kstat_irqs_cpu);
556
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index c63f3bc88f0b..4571ae7e085a 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -1,9 +1,12 @@
1/* 1/*
2 * IRQ subsystem internal functions and variables: 2 * IRQ subsystem internal functions and variables:
3 */ 3 */
4#include <linux/irqdesc.h>
4 5
5extern int noirqdebug; 6extern int noirqdebug;
6 7
8#define irq_data_to_desc(data) container_of(data, struct irq_desc, irq_data)
9
7/* Set default functions for irq_chip structures: */ 10/* Set default functions for irq_chip structures: */
8extern void irq_chip_set_defaults(struct irq_chip *chip); 11extern void irq_chip_set_defaults(struct irq_chip *chip);
9 12
@@ -15,21 +18,19 @@ extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
15extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp); 18extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp);
16extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume); 19extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume);
17 20
18extern struct lock_class_key irq_desc_lock_class;
19extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr); 21extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
20extern void clear_kstat_irqs(struct irq_desc *desc);
21extern raw_spinlock_t sparse_irq_lock;
22 22
23#ifdef CONFIG_SPARSE_IRQ 23/* Resending of interrupts :*/
24void replace_irq_desc(unsigned int irq, struct irq_desc *desc); 24void check_irq_resend(struct irq_desc *desc, unsigned int irq);
25#endif
26 25
27#ifdef CONFIG_PROC_FS 26#ifdef CONFIG_PROC_FS
28extern void register_irq_proc(unsigned int irq, struct irq_desc *desc); 27extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
28extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
29extern void register_handler_proc(unsigned int irq, struct irqaction *action); 29extern void register_handler_proc(unsigned int irq, struct irqaction *action);
30extern void unregister_handler_proc(unsigned int irq, struct irqaction *action); 30extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
31#else 31#else
32static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { } 32static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
33static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
33static inline void register_handler_proc(unsigned int irq, 34static inline void register_handler_proc(unsigned int irq,
34 struct irqaction *action) { } 35 struct irqaction *action) { }
35static inline void unregister_handler_proc(unsigned int irq, 36static inline void unregister_handler_proc(unsigned int irq,
@@ -40,17 +41,27 @@ extern int irq_select_affinity_usr(unsigned int irq);
40 41
41extern void irq_set_thread_affinity(struct irq_desc *desc); 42extern void irq_set_thread_affinity(struct irq_desc *desc);
42 43
44#ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
45static inline void irq_end(unsigned int irq, struct irq_desc *desc)
46{
47 if (desc->irq_data.chip && desc->irq_data.chip->end)
48 desc->irq_data.chip->end(irq);
49}
50#else
51static inline void irq_end(unsigned int irq, struct irq_desc *desc) { }
52#endif
53
43/* Inline functions for support of irq chips on slow busses */ 54/* Inline functions for support of irq chips on slow busses */
44static inline void chip_bus_lock(unsigned int irq, struct irq_desc *desc) 55static inline void chip_bus_lock(struct irq_desc *desc)
45{ 56{
46 if (unlikely(desc->chip->bus_lock)) 57 if (unlikely(desc->irq_data.chip->irq_bus_lock))
47 desc->chip->bus_lock(irq); 58 desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
48} 59}
49 60
50static inline void chip_bus_sync_unlock(unsigned int irq, struct irq_desc *desc) 61static inline void chip_bus_sync_unlock(struct irq_desc *desc)
51{ 62{
52 if (unlikely(desc->chip->bus_sync_unlock)) 63 if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
53 desc->chip->bus_sync_unlock(irq); 64 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
54} 65}
55 66
56/* 67/*
@@ -67,8 +78,8 @@ static inline void print_irq_desc(unsigned int irq, struct irq_desc *desc)
67 irq, desc, desc->depth, desc->irq_count, desc->irqs_unhandled); 78 irq, desc, desc->depth, desc->irq_count, desc->irqs_unhandled);
68 printk("->handle_irq(): %p, ", desc->handle_irq); 79 printk("->handle_irq(): %p, ", desc->handle_irq);
69 print_symbol("%s\n", (unsigned long)desc->handle_irq); 80 print_symbol("%s\n", (unsigned long)desc->handle_irq);
70 printk("->chip(): %p, ", desc->chip); 81 printk("->irq_data.chip(): %p, ", desc->irq_data.chip);
71 print_symbol("%s\n", (unsigned long)desc->chip); 82 print_symbol("%s\n", (unsigned long)desc->irq_data.chip);
72 printk("->action(): %p\n", desc->action); 83 printk("->action(): %p\n", desc->action);
73 if (desc->action) { 84 if (desc->action) {
74 printk("->action->handler(): %p, ", desc->action->handler); 85 printk("->action->handler(): %p, ", desc->action->handler);
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
new file mode 100644
index 000000000000..9d917ff72675
--- /dev/null
+++ b/kernel/irq/irqdesc.c
@@ -0,0 +1,395 @@
1/*
2 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
3 * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
4 *
5 * This file contains the interrupt descriptor management code
6 *
7 * Detailed information is available in Documentation/DocBook/genericirq
8 *
9 */
10#include <linux/irq.h>
11#include <linux/slab.h>
12#include <linux/module.h>
13#include <linux/interrupt.h>
14#include <linux/kernel_stat.h>
15#include <linux/radix-tree.h>
16#include <linux/bitmap.h>
17
18#include "internals.h"
19
20/*
21 * lockdep: we want to handle all irq_desc locks as a single lock-class:
22 */
23static struct lock_class_key irq_desc_lock_class;
24
25#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
26static void __init init_irq_default_affinity(void)
27{
28 alloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT);
29 cpumask_setall(irq_default_affinity);
30}
31#else
32static void __init init_irq_default_affinity(void)
33{
34}
35#endif
36
37#ifdef CONFIG_SMP
38static int alloc_masks(struct irq_desc *desc, gfp_t gfp, int node)
39{
40 if (!zalloc_cpumask_var_node(&desc->irq_data.affinity, gfp, node))
41 return -ENOMEM;
42
43#ifdef CONFIG_GENERIC_PENDING_IRQ
44 if (!zalloc_cpumask_var_node(&desc->pending_mask, gfp, node)) {
45 free_cpumask_var(desc->irq_data.affinity);
46 return -ENOMEM;
47 }
48#endif
49 return 0;
50}
51
52static void desc_smp_init(struct irq_desc *desc, int node)
53{
54 desc->irq_data.node = node;
55 cpumask_copy(desc->irq_data.affinity, irq_default_affinity);
56#ifdef CONFIG_GENERIC_PENDING_IRQ
57 cpumask_clear(desc->pending_mask);
58#endif
59}
60
61static inline int desc_node(struct irq_desc *desc)
62{
63 return desc->irq_data.node;
64}
65
66#else
67static inline int
68alloc_masks(struct irq_desc *desc, gfp_t gfp, int node) { return 0; }
69static inline void desc_smp_init(struct irq_desc *desc, int node) { }
70static inline int desc_node(struct irq_desc *desc) { return 0; }
71#endif
72
73static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node)
74{
75 desc->irq_data.irq = irq;
76 desc->irq_data.chip = &no_irq_chip;
77 desc->irq_data.chip_data = NULL;
78 desc->irq_data.handler_data = NULL;
79 desc->irq_data.msi_desc = NULL;
80 desc->status = IRQ_DEFAULT_INIT_FLAGS;
81 desc->handle_irq = handle_bad_irq;
82 desc->depth = 1;
83 desc->irq_count = 0;
84 desc->irqs_unhandled = 0;
85 desc->name = NULL;
86 memset(desc->kstat_irqs, 0, nr_cpu_ids * sizeof(*(desc->kstat_irqs)));
87 desc_smp_init(desc, node);
88}
89
90int nr_irqs = NR_IRQS;
91EXPORT_SYMBOL_GPL(nr_irqs);
92
93static DEFINE_MUTEX(sparse_irq_lock);
94static DECLARE_BITMAP(allocated_irqs, NR_IRQS);
95
96#ifdef CONFIG_SPARSE_IRQ
97
98static RADIX_TREE(irq_desc_tree, GFP_KERNEL);
99
100static void irq_insert_desc(unsigned int irq, struct irq_desc *desc)
101{
102 radix_tree_insert(&irq_desc_tree, irq, desc);
103}
104
105struct irq_desc *irq_to_desc(unsigned int irq)
106{
107 return radix_tree_lookup(&irq_desc_tree, irq);
108}
109
110static void delete_irq_desc(unsigned int irq)
111{
112 radix_tree_delete(&irq_desc_tree, irq);
113}
114
115#ifdef CONFIG_SMP
116static void free_masks(struct irq_desc *desc)
117{
118#ifdef CONFIG_GENERIC_PENDING_IRQ
119 free_cpumask_var(desc->pending_mask);
120#endif
121 free_cpumask_var(desc->irq_data.affinity);
122}
123#else
124static inline void free_masks(struct irq_desc *desc) { }
125#endif
126
127static struct irq_desc *alloc_desc(int irq, int node)
128{
129 struct irq_desc *desc;
130 gfp_t gfp = GFP_KERNEL;
131
132 desc = kzalloc_node(sizeof(*desc), gfp, node);
133 if (!desc)
134 return NULL;
135 /* allocate based on nr_cpu_ids */
136 desc->kstat_irqs = kzalloc_node(nr_cpu_ids * sizeof(*desc->kstat_irqs),
137 gfp, node);
138 if (!desc->kstat_irqs)
139 goto err_desc;
140
141 if (alloc_masks(desc, gfp, node))
142 goto err_kstat;
143
144 raw_spin_lock_init(&desc->lock);
145 lockdep_set_class(&desc->lock, &irq_desc_lock_class);
146
147 desc_set_defaults(irq, desc, node);
148
149 return desc;
150
151err_kstat:
152 kfree(desc->kstat_irqs);
153err_desc:
154 kfree(desc);
155 return NULL;
156}
157
158static void free_desc(unsigned int irq)
159{
160 struct irq_desc *desc = irq_to_desc(irq);
161
162 unregister_irq_proc(irq, desc);
163
164 mutex_lock(&sparse_irq_lock);
165 delete_irq_desc(irq);
166 mutex_unlock(&sparse_irq_lock);
167
168 free_masks(desc);
169 kfree(desc->kstat_irqs);
170 kfree(desc);
171}
172
173static int alloc_descs(unsigned int start, unsigned int cnt, int node)
174{
175 struct irq_desc *desc;
176 int i;
177
178 for (i = 0; i < cnt; i++) {
179 desc = alloc_desc(start + i, node);
180 if (!desc)
181 goto err;
182 mutex_lock(&sparse_irq_lock);
183 irq_insert_desc(start + i, desc);
184 mutex_unlock(&sparse_irq_lock);
185 }
186 return start;
187
188err:
189 for (i--; i >= 0; i--)
190 free_desc(start + i);
191
192 mutex_lock(&sparse_irq_lock);
193 bitmap_clear(allocated_irqs, start, cnt);
194 mutex_unlock(&sparse_irq_lock);
195 return -ENOMEM;
196}
197
198struct irq_desc * __ref irq_to_desc_alloc_node(unsigned int irq, int node)
199{
200 int res = irq_alloc_descs(irq, irq, 1, node);
201
202 if (res == -EEXIST || res == irq)
203 return irq_to_desc(irq);
204 return NULL;
205}
206
207int __init early_irq_init(void)
208{
209 int i, initcnt, node = first_online_node;
210 struct irq_desc *desc;
211
212 init_irq_default_affinity();
213
214 /* Let arch update nr_irqs and return the nr of preallocated irqs */
215 initcnt = arch_probe_nr_irqs();
216 printk(KERN_INFO "NR_IRQS:%d nr_irqs:%d %d\n", NR_IRQS, nr_irqs, initcnt);
217
218 for (i = 0; i < initcnt; i++) {
219 desc = alloc_desc(i, node);
220 set_bit(i, allocated_irqs);
221 irq_insert_desc(i, desc);
222 }
223 return arch_early_irq_init();
224}
225
226#else /* !CONFIG_SPARSE_IRQ */
227
228struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
229 [0 ... NR_IRQS-1] = {
230 .status = IRQ_DEFAULT_INIT_FLAGS,
231 .handle_irq = handle_bad_irq,
232 .depth = 1,
233 .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock),
234 }
235};
236
237static unsigned int kstat_irqs_all[NR_IRQS][NR_CPUS];
238int __init early_irq_init(void)
239{
240 int count, i, node = first_online_node;
241 struct irq_desc *desc;
242
243 init_irq_default_affinity();
244
245 printk(KERN_INFO "NR_IRQS:%d\n", NR_IRQS);
246
247 desc = irq_desc;
248 count = ARRAY_SIZE(irq_desc);
249
250 for (i = 0; i < count; i++) {
251 desc[i].irq_data.irq = i;
252 desc[i].irq_data.chip = &no_irq_chip;
253 desc[i].kstat_irqs = kstat_irqs_all[i];
254 alloc_masks(desc + i, GFP_KERNEL, node);
255 desc_smp_init(desc + i, node);
256 lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
257 }
258 return arch_early_irq_init();
259}
260
261struct irq_desc *irq_to_desc(unsigned int irq)
262{
263 return (irq < NR_IRQS) ? irq_desc + irq : NULL;
264}
265
266struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node)
267{
268 return irq_to_desc(irq);
269}
270
271static void free_desc(unsigned int irq)
272{
273 dynamic_irq_cleanup(irq);
274}
275
276static inline int alloc_descs(unsigned int start, unsigned int cnt, int node)
277{
278 return start;
279}
280#endif /* !CONFIG_SPARSE_IRQ */
281
282/* Dynamic interrupt handling */
283
284/**
285 * irq_free_descs - free irq descriptors
286 * @from: Start of descriptor range
287 * @cnt: Number of consecutive irqs to free
288 */
289void irq_free_descs(unsigned int from, unsigned int cnt)
290{
291 int i;
292
293 if (from >= nr_irqs || (from + cnt) > nr_irqs)
294 return;
295
296 for (i = 0; i < cnt; i++)
297 free_desc(from + i);
298
299 mutex_lock(&sparse_irq_lock);
300 bitmap_clear(allocated_irqs, from, cnt);
301 mutex_unlock(&sparse_irq_lock);
302}
303
304/**
305 * irq_alloc_descs - allocate and initialize a range of irq descriptors
306 * @irq: Allocate for specific irq number if irq >= 0
307 * @from: Start the search from this irq number
308 * @cnt: Number of consecutive irqs to allocate.
309 * @node: Preferred node on which the irq descriptor should be allocated
310 *
311 * Returns the first irq number or error code
312 */
313int __ref
314irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node)
315{
316 int start, ret;
317
318 if (!cnt)
319 return -EINVAL;
320
321 mutex_lock(&sparse_irq_lock);
322
323 start = bitmap_find_next_zero_area(allocated_irqs, nr_irqs, from, cnt, 0);
324 ret = -EEXIST;
325 if (irq >=0 && start != irq)
326 goto err;
327
328 ret = -ENOMEM;
329 if (start >= nr_irqs)
330 goto err;
331
332 bitmap_set(allocated_irqs, start, cnt);
333 mutex_unlock(&sparse_irq_lock);
334 return alloc_descs(start, cnt, node);
335
336err:
337 mutex_unlock(&sparse_irq_lock);
338 return ret;
339}
340
341/**
342 * irq_reserve_irqs - mark irqs allocated
343 * @from: mark from irq number
344 * @cnt: number of irqs to mark
345 *
346 * Returns 0 on success or an appropriate error code
347 */
348int irq_reserve_irqs(unsigned int from, unsigned int cnt)
349{
350 unsigned int start;
351 int ret = 0;
352
353 if (!cnt || (from + cnt) > nr_irqs)
354 return -EINVAL;
355
356 mutex_lock(&sparse_irq_lock);
357 start = bitmap_find_next_zero_area(allocated_irqs, nr_irqs, from, cnt, 0);
358 if (start == from)
359 bitmap_set(allocated_irqs, start, cnt);
360 else
361 ret = -EEXIST;
362 mutex_unlock(&sparse_irq_lock);
363 return ret;
364}
365
366/**
367 * irq_get_next_irq - get next allocated irq number
368 * @offset: where to start the search
369 *
370 * Returns next irq number after offset or nr_irqs if none is found.
371 */
372unsigned int irq_get_next_irq(unsigned int offset)
373{
374 return find_next_bit(allocated_irqs, nr_irqs, offset);
375}
376
377/**
378 * dynamic_irq_cleanup - cleanup a dynamically allocated irq
379 * @irq: irq number to initialize
380 */
381void dynamic_irq_cleanup(unsigned int irq)
382{
383 struct irq_desc *desc = irq_to_desc(irq);
384 unsigned long flags;
385
386 raw_spin_lock_irqsave(&desc->lock, flags);
387 desc_set_defaults(irq, desc, desc_node(desc));
388 raw_spin_unlock_irqrestore(&desc->lock, flags);
389}
390
391unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
392{
393 struct irq_desc *desc = irq_to_desc(irq);
394 return desc ? desc->kstat_irqs[cpu] : 0;
395}
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index c3003e9d91a3..644e8d5fa367 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -73,8 +73,8 @@ int irq_can_set_affinity(unsigned int irq)
73{ 73{
74 struct irq_desc *desc = irq_to_desc(irq); 74 struct irq_desc *desc = irq_to_desc(irq);
75 75
76 if (CHECK_IRQ_PER_CPU(desc->status) || !desc->chip || 76 if (CHECK_IRQ_PER_CPU(desc->status) || !desc->irq_data.chip ||
77 !desc->chip->set_affinity) 77 !desc->irq_data.chip->irq_set_affinity)
78 return 0; 78 return 0;
79 79
80 return 1; 80 return 1;
@@ -109,17 +109,18 @@ void irq_set_thread_affinity(struct irq_desc *desc)
109int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask) 109int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
110{ 110{
111 struct irq_desc *desc = irq_to_desc(irq); 111 struct irq_desc *desc = irq_to_desc(irq);
112 struct irq_chip *chip = desc->irq_data.chip;
112 unsigned long flags; 113 unsigned long flags;
113 114
114 if (!desc->chip->set_affinity) 115 if (!chip->irq_set_affinity)
115 return -EINVAL; 116 return -EINVAL;
116 117
117 raw_spin_lock_irqsave(&desc->lock, flags); 118 raw_spin_lock_irqsave(&desc->lock, flags);
118 119
119#ifdef CONFIG_GENERIC_PENDING_IRQ 120#ifdef CONFIG_GENERIC_PENDING_IRQ
120 if (desc->status & IRQ_MOVE_PCNTXT) { 121 if (desc->status & IRQ_MOVE_PCNTXT) {
121 if (!desc->chip->set_affinity(irq, cpumask)) { 122 if (!chip->irq_set_affinity(&desc->irq_data, cpumask, false)) {
122 cpumask_copy(desc->affinity, cpumask); 123 cpumask_copy(desc->irq_data.affinity, cpumask);
123 irq_set_thread_affinity(desc); 124 irq_set_thread_affinity(desc);
124 } 125 }
125 } 126 }
@@ -128,8 +129,8 @@ int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
128 cpumask_copy(desc->pending_mask, cpumask); 129 cpumask_copy(desc->pending_mask, cpumask);
129 } 130 }
130#else 131#else
131 if (!desc->chip->set_affinity(irq, cpumask)) { 132 if (!chip->irq_set_affinity(&desc->irq_data, cpumask, false)) {
132 cpumask_copy(desc->affinity, cpumask); 133 cpumask_copy(desc->irq_data.affinity, cpumask);
133 irq_set_thread_affinity(desc); 134 irq_set_thread_affinity(desc);
134 } 135 }
135#endif 136#endif
@@ -168,16 +169,16 @@ static int setup_affinity(unsigned int irq, struct irq_desc *desc)
168 * one of the targets is online. 169 * one of the targets is online.
169 */ 170 */
170 if (desc->status & (IRQ_AFFINITY_SET | IRQ_NO_BALANCING)) { 171 if (desc->status & (IRQ_AFFINITY_SET | IRQ_NO_BALANCING)) {
171 if (cpumask_any_and(desc->affinity, cpu_online_mask) 172 if (cpumask_any_and(desc->irq_data.affinity, cpu_online_mask)
172 < nr_cpu_ids) 173 < nr_cpu_ids)
173 goto set_affinity; 174 goto set_affinity;
174 else 175 else
175 desc->status &= ~IRQ_AFFINITY_SET; 176 desc->status &= ~IRQ_AFFINITY_SET;
176 } 177 }
177 178
178 cpumask_and(desc->affinity, cpu_online_mask, irq_default_affinity); 179 cpumask_and(desc->irq_data.affinity, cpu_online_mask, irq_default_affinity);
179set_affinity: 180set_affinity:
180 desc->chip->set_affinity(irq, desc->affinity); 181 desc->irq_data.chip->irq_set_affinity(&desc->irq_data, desc->irq_data.affinity, false);
181 182
182 return 0; 183 return 0;
183} 184}
@@ -223,7 +224,7 @@ void __disable_irq(struct irq_desc *desc, unsigned int irq, bool suspend)
223 224
224 if (!desc->depth++) { 225 if (!desc->depth++) {
225 desc->status |= IRQ_DISABLED; 226 desc->status |= IRQ_DISABLED;
226 desc->chip->disable(irq); 227 desc->irq_data.chip->irq_disable(&desc->irq_data);
227 } 228 }
228} 229}
229 230
@@ -246,11 +247,11 @@ void disable_irq_nosync(unsigned int irq)
246 if (!desc) 247 if (!desc)
247 return; 248 return;
248 249
249 chip_bus_lock(irq, desc); 250 chip_bus_lock(desc);
250 raw_spin_lock_irqsave(&desc->lock, flags); 251 raw_spin_lock_irqsave(&desc->lock, flags);
251 __disable_irq(desc, irq, false); 252 __disable_irq(desc, irq, false);
252 raw_spin_unlock_irqrestore(&desc->lock, flags); 253 raw_spin_unlock_irqrestore(&desc->lock, flags);
253 chip_bus_sync_unlock(irq, desc); 254 chip_bus_sync_unlock(desc);
254} 255}
255EXPORT_SYMBOL(disable_irq_nosync); 256EXPORT_SYMBOL(disable_irq_nosync);
256 257
@@ -313,7 +314,7 @@ void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume)
313 * IRQ line is re-enabled. 314 * IRQ line is re-enabled.
314 * 315 *
315 * This function may be called from IRQ context only when 316 * This function may be called from IRQ context only when
316 * desc->chip->bus_lock and desc->chip->bus_sync_unlock are NULL ! 317 * desc->irq_data.chip->bus_lock and desc->chip->bus_sync_unlock are NULL !
317 */ 318 */
318void enable_irq(unsigned int irq) 319void enable_irq(unsigned int irq)
319{ 320{
@@ -323,11 +324,11 @@ void enable_irq(unsigned int irq)
323 if (!desc) 324 if (!desc)
324 return; 325 return;
325 326
326 chip_bus_lock(irq, desc); 327 chip_bus_lock(desc);
327 raw_spin_lock_irqsave(&desc->lock, flags); 328 raw_spin_lock_irqsave(&desc->lock, flags);
328 __enable_irq(desc, irq, false); 329 __enable_irq(desc, irq, false);
329 raw_spin_unlock_irqrestore(&desc->lock, flags); 330 raw_spin_unlock_irqrestore(&desc->lock, flags);
330 chip_bus_sync_unlock(irq, desc); 331 chip_bus_sync_unlock(desc);
331} 332}
332EXPORT_SYMBOL(enable_irq); 333EXPORT_SYMBOL(enable_irq);
333 334
@@ -336,8 +337,8 @@ static int set_irq_wake_real(unsigned int irq, unsigned int on)
336 struct irq_desc *desc = irq_to_desc(irq); 337 struct irq_desc *desc = irq_to_desc(irq);
337 int ret = -ENXIO; 338 int ret = -ENXIO;
338 339
339 if (desc->chip->set_wake) 340 if (desc->irq_data.chip->irq_set_wake)
340 ret = desc->chip->set_wake(irq, on); 341 ret = desc->irq_data.chip->irq_set_wake(&desc->irq_data, on);
341 342
342 return ret; 343 return ret;
343} 344}
@@ -429,12 +430,12 @@ void compat_irq_chip_set_default_handler(struct irq_desc *desc)
429} 430}
430 431
431int __irq_set_trigger(struct irq_desc *desc, unsigned int irq, 432int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
432 unsigned long flags) 433 unsigned long flags)
433{ 434{
434 int ret; 435 int ret;
435 struct irq_chip *chip = desc->chip; 436 struct irq_chip *chip = desc->irq_data.chip;
436 437
437 if (!chip || !chip->set_type) { 438 if (!chip || !chip->irq_set_type) {
438 /* 439 /*
439 * IRQF_TRIGGER_* but the PIC does not support multiple 440 * IRQF_TRIGGER_* but the PIC does not support multiple
440 * flow-types? 441 * flow-types?
@@ -445,11 +446,11 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
445 } 446 }
446 447
447 /* caller masked out all except trigger mode flags */ 448 /* caller masked out all except trigger mode flags */
448 ret = chip->set_type(irq, flags); 449 ret = chip->irq_set_type(&desc->irq_data, flags);
449 450
450 if (ret) 451 if (ret)
451 pr_err("setting trigger mode %d for irq %u failed (%pF)\n", 452 pr_err("setting trigger mode %lu for irq %u failed (%pF)\n",
452 (int)flags, irq, chip->set_type); 453 flags, irq, chip->irq_set_type);
453 else { 454 else {
454 if (flags & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH)) 455 if (flags & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
455 flags |= IRQ_LEVEL; 456 flags |= IRQ_LEVEL;
@@ -457,8 +458,8 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
457 desc->status &= ~(IRQ_LEVEL | IRQ_TYPE_SENSE_MASK); 458 desc->status &= ~(IRQ_LEVEL | IRQ_TYPE_SENSE_MASK);
458 desc->status |= flags; 459 desc->status |= flags;
459 460
460 if (chip != desc->chip) 461 if (chip != desc->irq_data.chip)
461 irq_chip_set_defaults(desc->chip); 462 irq_chip_set_defaults(desc->irq_data.chip);
462 } 463 }
463 464
464 return ret; 465 return ret;
@@ -507,7 +508,7 @@ static int irq_wait_for_interrupt(struct irqaction *action)
507static void irq_finalize_oneshot(unsigned int irq, struct irq_desc *desc) 508static void irq_finalize_oneshot(unsigned int irq, struct irq_desc *desc)
508{ 509{
509again: 510again:
510 chip_bus_lock(irq, desc); 511 chip_bus_lock(desc);
511 raw_spin_lock_irq(&desc->lock); 512 raw_spin_lock_irq(&desc->lock);
512 513
513 /* 514 /*
@@ -521,17 +522,17 @@ again:
521 */ 522 */
522 if (unlikely(desc->status & IRQ_INPROGRESS)) { 523 if (unlikely(desc->status & IRQ_INPROGRESS)) {
523 raw_spin_unlock_irq(&desc->lock); 524 raw_spin_unlock_irq(&desc->lock);
524 chip_bus_sync_unlock(irq, desc); 525 chip_bus_sync_unlock(desc);
525 cpu_relax(); 526 cpu_relax();
526 goto again; 527 goto again;
527 } 528 }
528 529
529 if (!(desc->status & IRQ_DISABLED) && (desc->status & IRQ_MASKED)) { 530 if (!(desc->status & IRQ_DISABLED) && (desc->status & IRQ_MASKED)) {
530 desc->status &= ~IRQ_MASKED; 531 desc->status &= ~IRQ_MASKED;
531 desc->chip->unmask(irq); 532 desc->irq_data.chip->irq_unmask(&desc->irq_data);
532 } 533 }
533 raw_spin_unlock_irq(&desc->lock); 534 raw_spin_unlock_irq(&desc->lock);
534 chip_bus_sync_unlock(irq, desc); 535 chip_bus_sync_unlock(desc);
535} 536}
536 537
537#ifdef CONFIG_SMP 538#ifdef CONFIG_SMP
@@ -556,7 +557,7 @@ irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action)
556 } 557 }
557 558
558 raw_spin_lock_irq(&desc->lock); 559 raw_spin_lock_irq(&desc->lock);
559 cpumask_copy(mask, desc->affinity); 560 cpumask_copy(mask, desc->irq_data.affinity);
560 raw_spin_unlock_irq(&desc->lock); 561 raw_spin_unlock_irq(&desc->lock);
561 562
562 set_cpus_allowed_ptr(current, mask); 563 set_cpus_allowed_ptr(current, mask);
@@ -657,7 +658,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
657 if (!desc) 658 if (!desc)
658 return -EINVAL; 659 return -EINVAL;
659 660
660 if (desc->chip == &no_irq_chip) 661 if (desc->irq_data.chip == &no_irq_chip)
661 return -ENOSYS; 662 return -ENOSYS;
662 /* 663 /*
663 * Some drivers like serial.c use request_irq() heavily, 664 * Some drivers like serial.c use request_irq() heavily,
@@ -752,7 +753,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
752 } 753 }
753 754
754 if (!shared) { 755 if (!shared) {
755 irq_chip_set_defaults(desc->chip); 756 irq_chip_set_defaults(desc->irq_data.chip);
756 757
757 init_waitqueue_head(&desc->wait_for_threads); 758 init_waitqueue_head(&desc->wait_for_threads);
758 759
@@ -779,7 +780,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
779 if (!(desc->status & IRQ_NOAUTOEN)) { 780 if (!(desc->status & IRQ_NOAUTOEN)) {
780 desc->depth = 0; 781 desc->depth = 0;
781 desc->status &= ~IRQ_DISABLED; 782 desc->status &= ~IRQ_DISABLED;
782 desc->chip->startup(irq); 783 desc->irq_data.chip->irq_startup(&desc->irq_data);
783 } else 784 } else
784 /* Undo nested disables: */ 785 /* Undo nested disables: */
785 desc->depth = 1; 786 desc->depth = 1;
@@ -912,17 +913,17 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
912 913
913 /* Currently used only by UML, might disappear one day: */ 914 /* Currently used only by UML, might disappear one day: */
914#ifdef CONFIG_IRQ_RELEASE_METHOD 915#ifdef CONFIG_IRQ_RELEASE_METHOD
915 if (desc->chip->release) 916 if (desc->irq_data.chip->release)
916 desc->chip->release(irq, dev_id); 917 desc->irq_data.chip->release(irq, dev_id);
917#endif 918#endif
918 919
919 /* If this was the last handler, shut down the IRQ line: */ 920 /* If this was the last handler, shut down the IRQ line: */
920 if (!desc->action) { 921 if (!desc->action) {
921 desc->status |= IRQ_DISABLED; 922 desc->status |= IRQ_DISABLED;
922 if (desc->chip->shutdown) 923 if (desc->irq_data.chip->irq_shutdown)
923 desc->chip->shutdown(irq); 924 desc->irq_data.chip->irq_shutdown(&desc->irq_data);
924 else 925 else
925 desc->chip->disable(irq); 926 desc->irq_data.chip->irq_disable(&desc->irq_data);
926 } 927 }
927 928
928#ifdef CONFIG_SMP 929#ifdef CONFIG_SMP
@@ -997,9 +998,9 @@ void free_irq(unsigned int irq, void *dev_id)
997 if (!desc) 998 if (!desc)
998 return; 999 return;
999 1000
1000 chip_bus_lock(irq, desc); 1001 chip_bus_lock(desc);
1001 kfree(__free_irq(irq, dev_id)); 1002 kfree(__free_irq(irq, dev_id));
1002 chip_bus_sync_unlock(irq, desc); 1003 chip_bus_sync_unlock(desc);
1003} 1004}
1004EXPORT_SYMBOL(free_irq); 1005EXPORT_SYMBOL(free_irq);
1005 1006
@@ -1086,9 +1087,9 @@ int request_threaded_irq(unsigned int irq, irq_handler_t handler,
1086 action->name = devname; 1087 action->name = devname;
1087 action->dev_id = dev_id; 1088 action->dev_id = dev_id;
1088 1089
1089 chip_bus_lock(irq, desc); 1090 chip_bus_lock(desc);
1090 retval = __setup_irq(irq, desc, action); 1091 retval = __setup_irq(irq, desc, action);
1091 chip_bus_sync_unlock(irq, desc); 1092 chip_bus_sync_unlock(desc);
1092 1093
1093 if (retval) 1094 if (retval)
1094 kfree(action); 1095 kfree(action);
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index 241962280836..1d2541940480 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -7,6 +7,7 @@
7void move_masked_irq(int irq) 7void move_masked_irq(int irq)
8{ 8{
9 struct irq_desc *desc = irq_to_desc(irq); 9 struct irq_desc *desc = irq_to_desc(irq);
10 struct irq_chip *chip = desc->irq_data.chip;
10 11
11 if (likely(!(desc->status & IRQ_MOVE_PENDING))) 12 if (likely(!(desc->status & IRQ_MOVE_PENDING)))
12 return; 13 return;
@@ -24,7 +25,7 @@ void move_masked_irq(int irq)
24 if (unlikely(cpumask_empty(desc->pending_mask))) 25 if (unlikely(cpumask_empty(desc->pending_mask)))
25 return; 26 return;
26 27
27 if (!desc->chip->set_affinity) 28 if (!chip->irq_set_affinity)
28 return; 29 return;
29 30
30 assert_raw_spin_locked(&desc->lock); 31 assert_raw_spin_locked(&desc->lock);
@@ -43,8 +44,9 @@ void move_masked_irq(int irq)
43 */ 44 */
44 if (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask) 45 if (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask)
45 < nr_cpu_ids)) 46 < nr_cpu_ids))
46 if (!desc->chip->set_affinity(irq, desc->pending_mask)) { 47 if (!chip->irq_set_affinity(&desc->irq_data,
47 cpumask_copy(desc->affinity, desc->pending_mask); 48 desc->pending_mask, false)) {
49 cpumask_copy(desc->irq_data.affinity, desc->pending_mask);
48 irq_set_thread_affinity(desc); 50 irq_set_thread_affinity(desc);
49 } 51 }
50 52
@@ -61,8 +63,8 @@ void move_native_irq(int irq)
61 if (unlikely(desc->status & IRQ_DISABLED)) 63 if (unlikely(desc->status & IRQ_DISABLED))
62 return; 64 return;
63 65
64 desc->chip->mask(irq); 66 desc->irq_data.chip->irq_mask(&desc->irq_data);
65 move_masked_irq(irq); 67 move_masked_irq(irq);
66 desc->chip->unmask(irq); 68 desc->irq_data.chip->irq_unmask(&desc->irq_data);
67} 69}
68 70
diff --git a/kernel/irq/numa_migrate.c b/kernel/irq/numa_migrate.c
deleted file mode 100644
index 65d3845665ac..000000000000
--- a/kernel/irq/numa_migrate.c
+++ /dev/null
@@ -1,120 +0,0 @@
1/*
2 * NUMA irq-desc migration code
3 *
4 * Migrate IRQ data structures (irq_desc, chip_data, etc.) over to
5 * the new "home node" of the IRQ.
6 */
7
8#include <linux/irq.h>
9#include <linux/slab.h>
10#include <linux/module.h>
11#include <linux/random.h>
12#include <linux/interrupt.h>
13#include <linux/kernel_stat.h>
14
15#include "internals.h"
16
17static void init_copy_kstat_irqs(struct irq_desc *old_desc,
18 struct irq_desc *desc,
19 int node, int nr)
20{
21 init_kstat_irqs(desc, node, nr);
22
23 if (desc->kstat_irqs != old_desc->kstat_irqs)
24 memcpy(desc->kstat_irqs, old_desc->kstat_irqs,
25 nr * sizeof(*desc->kstat_irqs));
26}
27
28static void free_kstat_irqs(struct irq_desc *old_desc, struct irq_desc *desc)
29{
30 if (old_desc->kstat_irqs == desc->kstat_irqs)
31 return;
32
33 kfree(old_desc->kstat_irqs);
34 old_desc->kstat_irqs = NULL;
35}
36
37static bool init_copy_one_irq_desc(int irq, struct irq_desc *old_desc,
38 struct irq_desc *desc, int node)
39{
40 memcpy(desc, old_desc, sizeof(struct irq_desc));
41 if (!alloc_desc_masks(desc, node, false)) {
42 printk(KERN_ERR "irq %d: can not get new irq_desc cpumask "
43 "for migration.\n", irq);
44 return false;
45 }
46 raw_spin_lock_init(&desc->lock);
47 desc->node = node;
48 lockdep_set_class(&desc->lock, &irq_desc_lock_class);
49 init_copy_kstat_irqs(old_desc, desc, node, nr_cpu_ids);
50 init_copy_desc_masks(old_desc, desc);
51 arch_init_copy_chip_data(old_desc, desc, node);
52 return true;
53}
54
55static void free_one_irq_desc(struct irq_desc *old_desc, struct irq_desc *desc)
56{
57 free_kstat_irqs(old_desc, desc);
58 free_desc_masks(old_desc, desc);
59 arch_free_chip_data(old_desc, desc);
60}
61
62static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
63 int node)
64{
65 struct irq_desc *desc;
66 unsigned int irq;
67 unsigned long flags;
68
69 irq = old_desc->irq;
70
71 raw_spin_lock_irqsave(&sparse_irq_lock, flags);
72
73 /* We have to check it to avoid races with another CPU */
74 desc = irq_to_desc(irq);
75
76 if (desc && old_desc != desc)
77 goto out_unlock;
78
79 desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
80 if (!desc) {
81 printk(KERN_ERR "irq %d: can not get new irq_desc "
82 "for migration.\n", irq);
83 /* still use old one */
84 desc = old_desc;
85 goto out_unlock;
86 }
87 if (!init_copy_one_irq_desc(irq, old_desc, desc, node)) {
88 /* still use old one */
89 kfree(desc);
90 desc = old_desc;
91 goto out_unlock;
92 }
93
94 replace_irq_desc(irq, desc);
95 raw_spin_unlock_irqrestore(&sparse_irq_lock, flags);
96
97 /* free the old one */
98 free_one_irq_desc(old_desc, desc);
99 kfree(old_desc);
100
101 return desc;
102
103out_unlock:
104 raw_spin_unlock_irqrestore(&sparse_irq_lock, flags);
105
106 return desc;
107}
108
109struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
110{
111 /* those static or target node is -1, do not move them */
112 if (desc->irq < NR_IRQS_LEGACY || node == -1)
113 return desc;
114
115 if (desc->node != node)
116 desc = __real_move_irq_desc(desc, node);
117
118 return desc;
119}
120
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index 09a2ee540bd2..01b1d3a88983 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -21,7 +21,7 @@ static struct proc_dir_entry *root_irq_dir;
21static int irq_affinity_proc_show(struct seq_file *m, void *v) 21static int irq_affinity_proc_show(struct seq_file *m, void *v)
22{ 22{
23 struct irq_desc *desc = irq_to_desc((long)m->private); 23 struct irq_desc *desc = irq_to_desc((long)m->private);
24 const struct cpumask *mask = desc->affinity; 24 const struct cpumask *mask = desc->irq_data.affinity;
25 25
26#ifdef CONFIG_GENERIC_PENDING_IRQ 26#ifdef CONFIG_GENERIC_PENDING_IRQ
27 if (desc->status & IRQ_MOVE_PENDING) 27 if (desc->status & IRQ_MOVE_PENDING)
@@ -65,7 +65,7 @@ static ssize_t irq_affinity_proc_write(struct file *file,
65 cpumask_var_t new_value; 65 cpumask_var_t new_value;
66 int err; 66 int err;
67 67
68 if (!irq_to_desc(irq)->chip->set_affinity || no_irq_affinity || 68 if (!irq_to_desc(irq)->irq_data.chip->irq_set_affinity || no_irq_affinity ||
69 irq_balancing_disabled(irq)) 69 irq_balancing_disabled(irq))
70 return -EIO; 70 return -EIO;
71 71
@@ -185,7 +185,7 @@ static int irq_node_proc_show(struct seq_file *m, void *v)
185{ 185{
186 struct irq_desc *desc = irq_to_desc((long) m->private); 186 struct irq_desc *desc = irq_to_desc((long) m->private);
187 187
188 seq_printf(m, "%d\n", desc->node); 188 seq_printf(m, "%d\n", desc->irq_data.node);
189 return 0; 189 return 0;
190} 190}
191 191
@@ -269,7 +269,7 @@ void register_irq_proc(unsigned int irq, struct irq_desc *desc)
269{ 269{
270 char name [MAX_NAMELEN]; 270 char name [MAX_NAMELEN];
271 271
272 if (!root_irq_dir || (desc->chip == &no_irq_chip) || desc->dir) 272 if (!root_irq_dir || (desc->irq_data.chip == &no_irq_chip) || desc->dir)
273 return; 273 return;
274 274
275 memset(name, 0, MAX_NAMELEN); 275 memset(name, 0, MAX_NAMELEN);
@@ -297,6 +297,24 @@ void register_irq_proc(unsigned int irq, struct irq_desc *desc)
297 &irq_spurious_proc_fops, (void *)(long)irq); 297 &irq_spurious_proc_fops, (void *)(long)irq);
298} 298}
299 299
300void unregister_irq_proc(unsigned int irq, struct irq_desc *desc)
301{
302 char name [MAX_NAMELEN];
303
304 if (!root_irq_dir || !desc->dir)
305 return;
306#ifdef CONFIG_SMP
307 remove_proc_entry("smp_affinity", desc->dir);
308 remove_proc_entry("affinity_hint", desc->dir);
309 remove_proc_entry("node", desc->dir);
310#endif
311 remove_proc_entry("spurious", desc->dir);
312
313 memset(name, 0, MAX_NAMELEN);
314 sprintf(name, "%u", irq);
315 remove_proc_entry(name, root_irq_dir);
316}
317
300#undef MAX_NAMELEN 318#undef MAX_NAMELEN
301 319
302void unregister_handler_proc(unsigned int irq, struct irqaction *action) 320void unregister_handler_proc(unsigned int irq, struct irqaction *action)
diff --git a/kernel/irq/resend.c b/kernel/irq/resend.c
index 090c3763f3a2..891115a929aa 100644
--- a/kernel/irq/resend.c
+++ b/kernel/irq/resend.c
@@ -60,7 +60,7 @@ void check_irq_resend(struct irq_desc *desc, unsigned int irq)
60 /* 60 /*
61 * Make sure the interrupt is enabled, before resending it: 61 * Make sure the interrupt is enabled, before resending it:
62 */ 62 */
63 desc->chip->enable(irq); 63 desc->irq_data.chip->irq_enable(&desc->irq_data);
64 64
65 /* 65 /*
66 * We do not resend level type interrupts. Level type 66 * We do not resend level type interrupts. Level type
@@ -70,7 +70,8 @@ void check_irq_resend(struct irq_desc *desc, unsigned int irq)
70 if ((status & (IRQ_LEVEL | IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) { 70 if ((status & (IRQ_LEVEL | IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) {
71 desc->status = (status & ~IRQ_PENDING) | IRQ_REPLAY; 71 desc->status = (status & ~IRQ_PENDING) | IRQ_REPLAY;
72 72
73 if (!desc->chip->retrigger || !desc->chip->retrigger(irq)) { 73 if (!desc->irq_data.chip->irq_retrigger ||
74 !desc->irq_data.chip->irq_retrigger(&desc->irq_data)) {
74#ifdef CONFIG_HARDIRQS_SW_RESEND 75#ifdef CONFIG_HARDIRQS_SW_RESEND
75 /* Set it pending and activate the softirq: */ 76 /* Set it pending and activate the softirq: */
76 set_bit(irq, irqs_resend); 77 set_bit(irq, irqs_resend);
diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
index 89fb90ae534f..3089d3b9d5f3 100644
--- a/kernel/irq/spurious.c
+++ b/kernel/irq/spurious.c
@@ -14,6 +14,8 @@
14#include <linux/moduleparam.h> 14#include <linux/moduleparam.h>
15#include <linux/timer.h> 15#include <linux/timer.h>
16 16
17#include "internals.h"
18
17static int irqfixup __read_mostly; 19static int irqfixup __read_mostly;
18 20
19#define POLL_SPURIOUS_IRQ_INTERVAL (HZ/10) 21#define POLL_SPURIOUS_IRQ_INTERVAL (HZ/10)
@@ -78,8 +80,8 @@ static int try_one_irq(int irq, struct irq_desc *desc)
78 * If we did actual work for the real IRQ line we must let the 80 * If we did actual work for the real IRQ line we must let the
79 * IRQ controller clean up too 81 * IRQ controller clean up too
80 */ 82 */
81 if (work && desc->chip && desc->chip->end) 83 if (work)
82 desc->chip->end(irq); 84 irq_end(irq, desc);
83 raw_spin_unlock(&desc->lock); 85 raw_spin_unlock(&desc->lock);
84 86
85 return ok; 87 return ok;
@@ -254,7 +256,7 @@ void note_interrupt(unsigned int irq, struct irq_desc *desc,
254 printk(KERN_EMERG "Disabling IRQ #%d\n", irq); 256 printk(KERN_EMERG "Disabling IRQ #%d\n", irq);
255 desc->status |= IRQ_DISABLED | IRQ_SPURIOUS_DISABLED; 257 desc->status |= IRQ_DISABLED | IRQ_SPURIOUS_DISABLED;
256 desc->depth++; 258 desc->depth++;
257 desc->chip->disable(irq); 259 desc->irq_data.chip->irq_disable(&desc->irq_data);
258 260
259 mod_timer(&poll_spurious_irq_timer, 261 mod_timer(&poll_spurious_irq_timer,
260 jiffies + POLL_SPURIOUS_IRQ_INTERVAL); 262 jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index f2852a510232..42ba65dff7d9 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -639,6 +639,16 @@ look_up_lock_class(struct lockdep_map *lock, unsigned int subclass)
639 } 639 }
640#endif 640#endif
641 641
642 if (unlikely(subclass >= MAX_LOCKDEP_SUBCLASSES)) {
643 debug_locks_off();
644 printk(KERN_ERR
645 "BUG: looking up invalid subclass: %u\n", subclass);
646 printk(KERN_ERR
647 "turning off the locking correctness validator.\n");
648 dump_stack();
649 return NULL;
650 }
651
642 /* 652 /*
643 * Static locks do not have their class-keys yet - for them the key 653 * Static locks do not have their class-keys yet - for them the key
644 * is the lock object itself: 654 * is the lock object itself:
@@ -774,7 +784,9 @@ out_unlock_set:
774 raw_local_irq_restore(flags); 784 raw_local_irq_restore(flags);
775 785
776 if (!subclass || force) 786 if (!subclass || force)
777 lock->class_cache = class; 787 lock->class_cache[0] = class;
788 else if (subclass < NR_LOCKDEP_CACHING_CLASSES)
789 lock->class_cache[subclass] = class;
778 790
779 if (DEBUG_LOCKS_WARN_ON(class->subclass != subclass)) 791 if (DEBUG_LOCKS_WARN_ON(class->subclass != subclass))
780 return NULL; 792 return NULL;
@@ -2679,7 +2691,11 @@ static int mark_lock(struct task_struct *curr, struct held_lock *this,
2679void lockdep_init_map(struct lockdep_map *lock, const char *name, 2691void lockdep_init_map(struct lockdep_map *lock, const char *name,
2680 struct lock_class_key *key, int subclass) 2692 struct lock_class_key *key, int subclass)
2681{ 2693{
2682 lock->class_cache = NULL; 2694 int i;
2695
2696 for (i = 0; i < NR_LOCKDEP_CACHING_CLASSES; i++)
2697 lock->class_cache[i] = NULL;
2698
2683#ifdef CONFIG_LOCK_STAT 2699#ifdef CONFIG_LOCK_STAT
2684 lock->cpu = raw_smp_processor_id(); 2700 lock->cpu = raw_smp_processor_id();
2685#endif 2701#endif
@@ -2739,21 +2755,13 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass,
2739 if (DEBUG_LOCKS_WARN_ON(!irqs_disabled())) 2755 if (DEBUG_LOCKS_WARN_ON(!irqs_disabled()))
2740 return 0; 2756 return 0;
2741 2757
2742 if (unlikely(subclass >= MAX_LOCKDEP_SUBCLASSES)) {
2743 debug_locks_off();
2744 printk("BUG: MAX_LOCKDEP_SUBCLASSES too low!\n");
2745 printk("turning off the locking correctness validator.\n");
2746 dump_stack();
2747 return 0;
2748 }
2749
2750 if (lock->key == &__lockdep_no_validate__) 2758 if (lock->key == &__lockdep_no_validate__)
2751 check = 1; 2759 check = 1;
2752 2760
2753 if (!subclass) 2761 if (subclass < NR_LOCKDEP_CACHING_CLASSES)
2754 class = lock->class_cache; 2762 class = lock->class_cache[subclass];
2755 /* 2763 /*
2756 * Not cached yet or subclass? 2764 * Not cached?
2757 */ 2765 */
2758 if (unlikely(!class)) { 2766 if (unlikely(!class)) {
2759 class = register_lock_class(lock, subclass, 0); 2767 class = register_lock_class(lock, subclass, 0);
@@ -2918,7 +2926,7 @@ static int match_held_lock(struct held_lock *hlock, struct lockdep_map *lock)
2918 return 1; 2926 return 1;
2919 2927
2920 if (hlock->references) { 2928 if (hlock->references) {
2921 struct lock_class *class = lock->class_cache; 2929 struct lock_class *class = lock->class_cache[0];
2922 2930
2923 if (!class) 2931 if (!class)
2924 class = look_up_lock_class(lock, 0); 2932 class = look_up_lock_class(lock, 0);
@@ -3559,7 +3567,12 @@ void lockdep_reset_lock(struct lockdep_map *lock)
3559 if (list_empty(head)) 3567 if (list_empty(head))
3560 continue; 3568 continue;
3561 list_for_each_entry_safe(class, next, head, hash_entry) { 3569 list_for_each_entry_safe(class, next, head, hash_entry) {
3562 if (unlikely(class == lock->class_cache)) { 3570 int match = 0;
3571
3572 for (j = 0; j < NR_LOCKDEP_CACHING_CLASSES; j++)
3573 match |= class == lock->class_cache[j];
3574
3575 if (unlikely(match)) {
3563 if (debug_locks_off_graph_unlock()) 3576 if (debug_locks_off_graph_unlock())
3564 WARN_ON(1); 3577 WARN_ON(1);
3565 goto out_restore; 3578 goto out_restore;
@@ -3775,7 +3788,7 @@ EXPORT_SYMBOL_GPL(debug_show_all_locks);
3775 * Careful: only use this function if you are sure that 3788 * Careful: only use this function if you are sure that
3776 * the task cannot run in parallel! 3789 * the task cannot run in parallel!
3777 */ 3790 */
3778void __debug_show_held_locks(struct task_struct *task) 3791void debug_show_held_locks(struct task_struct *task)
3779{ 3792{
3780 if (unlikely(!debug_locks)) { 3793 if (unlikely(!debug_locks)) {
3781 printk("INFO: lockdep is turned off.\n"); 3794 printk("INFO: lockdep is turned off.\n");
@@ -3783,12 +3796,6 @@ void __debug_show_held_locks(struct task_struct *task)
3783 } 3796 }
3784 lockdep_print_held_locks(task); 3797 lockdep_print_held_locks(task);
3785} 3798}
3786EXPORT_SYMBOL_GPL(__debug_show_held_locks);
3787
3788void debug_show_held_locks(struct task_struct *task)
3789{
3790 __debug_show_held_locks(task);
3791}
3792EXPORT_SYMBOL_GPL(debug_show_held_locks); 3799EXPORT_SYMBOL_GPL(debug_show_held_locks);
3793 3800
3794void lockdep_sys_exit(void) 3801void lockdep_sys_exit(void)
diff --git a/kernel/pid.c b/kernel/pid.c
index d55c6fb8d087..39b65b69584f 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -401,7 +401,7 @@ struct task_struct *pid_task(struct pid *pid, enum pid_type type)
401 struct task_struct *result = NULL; 401 struct task_struct *result = NULL;
402 if (pid) { 402 if (pid) {
403 struct hlist_node *first; 403 struct hlist_node *first;
404 first = rcu_dereference_check(pid->tasks[type].first, 404 first = rcu_dereference_check(hlist_first_rcu(&pid->tasks[type]),
405 rcu_read_lock_held() || 405 rcu_read_lock_held() ||
406 lockdep_tasklist_lock_is_held()); 406 lockdep_tasklist_lock_is_held());
407 if (first) 407 if (first)
@@ -416,6 +416,7 @@ EXPORT_SYMBOL(pid_task);
416 */ 416 */
417struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns) 417struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns)
418{ 418{
419 rcu_lockdep_assert(rcu_read_lock_held());
419 return pid_task(find_pid_ns(nr, ns), PIDTYPE_PID); 420 return pid_task(find_pid_ns(nr, ns), PIDTYPE_PID);
420} 421}
421 422
diff --git a/kernel/printk.c b/kernel/printk.c
index 8fe465ac008a..2531017795f6 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -85,7 +85,7 @@ EXPORT_SYMBOL(oops_in_progress);
85 * provides serialisation for access to the entire console 85 * provides serialisation for access to the entire console
86 * driver system. 86 * driver system.
87 */ 87 */
88static DECLARE_MUTEX(console_sem); 88static DEFINE_SEMAPHORE(console_sem);
89struct console *console_drivers; 89struct console *console_drivers;
90EXPORT_SYMBOL_GPL(console_drivers); 90EXPORT_SYMBOL_GPL(console_drivers);
91 91
@@ -556,7 +556,7 @@ static void zap_locks(void)
556 /* If a crash is occurring, make sure we can't deadlock */ 556 /* If a crash is occurring, make sure we can't deadlock */
557 spin_lock_init(&logbuf_lock); 557 spin_lock_init(&logbuf_lock);
558 /* And make sure that we print immediately */ 558 /* And make sure that we print immediately */
559 init_MUTEX(&console_sem); 559 sema_init(&console_sem, 1);
560} 560}
561 561
562#if defined(CONFIG_PRINTK_TIME) 562#if defined(CONFIG_PRINTK_TIME)
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index 4d169835fb36..a23a57a976d1 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -73,12 +73,14 @@ int debug_lockdep_rcu_enabled(void)
73EXPORT_SYMBOL_GPL(debug_lockdep_rcu_enabled); 73EXPORT_SYMBOL_GPL(debug_lockdep_rcu_enabled);
74 74
75/** 75/**
76 * rcu_read_lock_bh_held - might we be in RCU-bh read-side critical section? 76 * rcu_read_lock_bh_held() - might we be in RCU-bh read-side critical section?
77 * 77 *
78 * Check for bottom half being disabled, which covers both the 78 * Check for bottom half being disabled, which covers both the
79 * CONFIG_PROVE_RCU and not cases. Note that if someone uses 79 * CONFIG_PROVE_RCU and not cases. Note that if someone uses
80 * rcu_read_lock_bh(), but then later enables BH, lockdep (if enabled) 80 * rcu_read_lock_bh(), but then later enables BH, lockdep (if enabled)
81 * will show the situation. 81 * will show the situation. This is useful for debug checks in functions
82 * that require that they be called within an RCU read-side critical
83 * section.
82 * 84 *
83 * Check debug_lockdep_rcu_enabled() to prevent false positives during boot. 85 * Check debug_lockdep_rcu_enabled() to prevent false positives during boot.
84 */ 86 */
@@ -86,7 +88,7 @@ int rcu_read_lock_bh_held(void)
86{ 88{
87 if (!debug_lockdep_rcu_enabled()) 89 if (!debug_lockdep_rcu_enabled())
88 return 1; 90 return 1;
89 return in_softirq(); 91 return in_softirq() || irqs_disabled();
90} 92}
91EXPORT_SYMBOL_GPL(rcu_read_lock_bh_held); 93EXPORT_SYMBOL_GPL(rcu_read_lock_bh_held);
92 94
diff --git a/kernel/rcutiny.c b/kernel/rcutiny.c
index 196ec02f8be0..d806735342ac 100644
--- a/kernel/rcutiny.c
+++ b/kernel/rcutiny.c
@@ -59,6 +59,14 @@ int rcu_scheduler_active __read_mostly;
59EXPORT_SYMBOL_GPL(rcu_scheduler_active); 59EXPORT_SYMBOL_GPL(rcu_scheduler_active);
60#endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */ 60#endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
61 61
62/* Forward declarations for rcutiny_plugin.h. */
63static void __rcu_process_callbacks(struct rcu_ctrlblk *rcp);
64static void __call_rcu(struct rcu_head *head,
65 void (*func)(struct rcu_head *rcu),
66 struct rcu_ctrlblk *rcp);
67
68#include "rcutiny_plugin.h"
69
62#ifdef CONFIG_NO_HZ 70#ifdef CONFIG_NO_HZ
63 71
64static long rcu_dynticks_nesting = 1; 72static long rcu_dynticks_nesting = 1;
@@ -140,6 +148,7 @@ void rcu_check_callbacks(int cpu, int user)
140 rcu_sched_qs(cpu); 148 rcu_sched_qs(cpu);
141 else if (!in_softirq()) 149 else if (!in_softirq())
142 rcu_bh_qs(cpu); 150 rcu_bh_qs(cpu);
151 rcu_preempt_check_callbacks();
143} 152}
144 153
145/* 154/*
@@ -162,6 +171,7 @@ static void __rcu_process_callbacks(struct rcu_ctrlblk *rcp)
162 *rcp->donetail = NULL; 171 *rcp->donetail = NULL;
163 if (rcp->curtail == rcp->donetail) 172 if (rcp->curtail == rcp->donetail)
164 rcp->curtail = &rcp->rcucblist; 173 rcp->curtail = &rcp->rcucblist;
174 rcu_preempt_remove_callbacks(rcp);
165 rcp->donetail = &rcp->rcucblist; 175 rcp->donetail = &rcp->rcucblist;
166 local_irq_restore(flags); 176 local_irq_restore(flags);
167 177
@@ -182,6 +192,7 @@ static void rcu_process_callbacks(struct softirq_action *unused)
182{ 192{
183 __rcu_process_callbacks(&rcu_sched_ctrlblk); 193 __rcu_process_callbacks(&rcu_sched_ctrlblk);
184 __rcu_process_callbacks(&rcu_bh_ctrlblk); 194 __rcu_process_callbacks(&rcu_bh_ctrlblk);
195 rcu_preempt_process_callbacks();
185} 196}
186 197
187/* 198/*
@@ -223,15 +234,15 @@ static void __call_rcu(struct rcu_head *head,
223} 234}
224 235
225/* 236/*
226 * Post an RCU callback to be invoked after the end of an RCU grace 237 * Post an RCU callback to be invoked after the end of an RCU-sched grace
227 * period. But since we have but one CPU, that would be after any 238 * period. But since we have but one CPU, that would be after any
228 * quiescent state. 239 * quiescent state.
229 */ 240 */
230void call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu)) 241void call_rcu_sched(struct rcu_head *head, void (*func)(struct rcu_head *rcu))
231{ 242{
232 __call_rcu(head, func, &rcu_sched_ctrlblk); 243 __call_rcu(head, func, &rcu_sched_ctrlblk);
233} 244}
234EXPORT_SYMBOL_GPL(call_rcu); 245EXPORT_SYMBOL_GPL(call_rcu_sched);
235 246
236/* 247/*
237 * Post an RCU bottom-half callback to be invoked after any subsequent 248 * Post an RCU bottom-half callback to be invoked after any subsequent
@@ -243,20 +254,6 @@ void call_rcu_bh(struct rcu_head *head, void (*func)(struct rcu_head *rcu))
243} 254}
244EXPORT_SYMBOL_GPL(call_rcu_bh); 255EXPORT_SYMBOL_GPL(call_rcu_bh);
245 256
246void rcu_barrier(void)
247{
248 struct rcu_synchronize rcu;
249
250 init_rcu_head_on_stack(&rcu.head);
251 init_completion(&rcu.completion);
252 /* Will wake me after RCU finished. */
253 call_rcu(&rcu.head, wakeme_after_rcu);
254 /* Wait for it. */
255 wait_for_completion(&rcu.completion);
256 destroy_rcu_head_on_stack(&rcu.head);
257}
258EXPORT_SYMBOL_GPL(rcu_barrier);
259
260void rcu_barrier_bh(void) 257void rcu_barrier_bh(void)
261{ 258{
262 struct rcu_synchronize rcu; 259 struct rcu_synchronize rcu;
@@ -289,5 +286,3 @@ void __init rcu_init(void)
289{ 286{
290 open_softirq(RCU_SOFTIRQ, rcu_process_callbacks); 287 open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);
291} 288}
292
293#include "rcutiny_plugin.h"
diff --git a/kernel/rcutiny_plugin.h b/kernel/rcutiny_plugin.h
index d223a92bc742..6ceca4f745ff 100644
--- a/kernel/rcutiny_plugin.h
+++ b/kernel/rcutiny_plugin.h
@@ -1,7 +1,7 @@
1/* 1/*
2 * Read-Copy Update mechanism for mutual exclusion (tree-based version) 2 * Read-Copy Update mechanism for mutual exclusion, the Bloatwatch edition
3 * Internal non-public definitions that provide either classic 3 * Internal non-public definitions that provide either classic
4 * or preemptable semantics. 4 * or preemptible semantics.
5 * 5 *
6 * This program is free software; you can redistribute it and/or modify 6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by 7 * it under the terms of the GNU General Public License as published by
@@ -17,11 +17,587 @@
17 * along with this program; if not, write to the Free Software 17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 * 19 *
20 * Copyright IBM Corporation, 2009 20 * Copyright (c) 2010 Linaro
21 * 21 *
22 * Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com> 22 * Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
23 */ 23 */
24 24
25#ifdef CONFIG_TINY_PREEMPT_RCU
26
27#include <linux/delay.h>
28
29/* Global control variables for preemptible RCU. */
30struct rcu_preempt_ctrlblk {
31 struct rcu_ctrlblk rcb; /* curtail: ->next ptr of last CB for GP. */
32 struct rcu_head **nexttail;
33 /* Tasks blocked in a preemptible RCU */
34 /* read-side critical section while an */
35 /* preemptible-RCU grace period is in */
36 /* progress must wait for a later grace */
37 /* period. This pointer points to the */
38 /* ->next pointer of the last task that */
39 /* must wait for a later grace period, or */
40 /* to &->rcb.rcucblist if there is no */
41 /* such task. */
42 struct list_head blkd_tasks;
43 /* Tasks blocked in RCU read-side critical */
44 /* section. Tasks are placed at the head */
45 /* of this list and age towards the tail. */
46 struct list_head *gp_tasks;
47 /* Pointer to the first task blocking the */
48 /* current grace period, or NULL if there */
49 /* is not such task. */
50 struct list_head *exp_tasks;
51 /* Pointer to first task blocking the */
52 /* current expedited grace period, or NULL */
53 /* if there is no such task. If there */
54 /* is no current expedited grace period, */
55 /* then there cannot be any such task. */
56 u8 gpnum; /* Current grace period. */
57 u8 gpcpu; /* Last grace period blocked by the CPU. */
58 u8 completed; /* Last grace period completed. */
59 /* If all three are equal, RCU is idle. */
60};
61
62static struct rcu_preempt_ctrlblk rcu_preempt_ctrlblk = {
63 .rcb.donetail = &rcu_preempt_ctrlblk.rcb.rcucblist,
64 .rcb.curtail = &rcu_preempt_ctrlblk.rcb.rcucblist,
65 .nexttail = &rcu_preempt_ctrlblk.rcb.rcucblist,
66 .blkd_tasks = LIST_HEAD_INIT(rcu_preempt_ctrlblk.blkd_tasks),
67};
68
69static int rcu_preempted_readers_exp(void);
70static void rcu_report_exp_done(void);
71
72/*
73 * Return true if the CPU has not yet responded to the current grace period.
74 */
75static int rcu_cpu_blocking_cur_gp(void)
76{
77 return rcu_preempt_ctrlblk.gpcpu != rcu_preempt_ctrlblk.gpnum;
78}
79
80/*
81 * Check for a running RCU reader. Because there is only one CPU,
82 * there can be but one running RCU reader at a time. ;-)
83 */
84static int rcu_preempt_running_reader(void)
85{
86 return current->rcu_read_lock_nesting;
87}
88
89/*
90 * Check for preempted RCU readers blocking any grace period.
91 * If the caller needs a reliable answer, it must disable hard irqs.
92 */
93static int rcu_preempt_blocked_readers_any(void)
94{
95 return !list_empty(&rcu_preempt_ctrlblk.blkd_tasks);
96}
97
98/*
99 * Check for preempted RCU readers blocking the current grace period.
100 * If the caller needs a reliable answer, it must disable hard irqs.
101 */
102static int rcu_preempt_blocked_readers_cgp(void)
103{
104 return rcu_preempt_ctrlblk.gp_tasks != NULL;
105}
106
107/*
108 * Return true if another preemptible-RCU grace period is needed.
109 */
110static int rcu_preempt_needs_another_gp(void)
111{
112 return *rcu_preempt_ctrlblk.rcb.curtail != NULL;
113}
114
115/*
116 * Return true if a preemptible-RCU grace period is in progress.
117 * The caller must disable hardirqs.
118 */
119static int rcu_preempt_gp_in_progress(void)
120{
121 return rcu_preempt_ctrlblk.completed != rcu_preempt_ctrlblk.gpnum;
122}
123
124/*
125 * Record a preemptible-RCU quiescent state for the specified CPU. Note
126 * that this just means that the task currently running on the CPU is
127 * in a quiescent state. There might be any number of tasks blocked
128 * while in an RCU read-side critical section.
129 *
130 * Unlike the other rcu_*_qs() functions, callers to this function
131 * must disable irqs in order to protect the assignment to
132 * ->rcu_read_unlock_special.
133 *
134 * Because this is a single-CPU implementation, the only way a grace
135 * period can end is if the CPU is in a quiescent state. The reason is
136 * that a blocked preemptible-RCU reader can exit its critical section
137 * only if the CPU is running it at the time. Therefore, when the
138 * last task blocking the current grace period exits its RCU read-side
139 * critical section, neither the CPU nor blocked tasks will be stopping
140 * the current grace period. (In contrast, SMP implementations
141 * might have CPUs running in RCU read-side critical sections that
142 * block later grace periods -- but this is not possible given only
143 * one CPU.)
144 */
145static void rcu_preempt_cpu_qs(void)
146{
147 /* Record both CPU and task as having responded to current GP. */
148 rcu_preempt_ctrlblk.gpcpu = rcu_preempt_ctrlblk.gpnum;
149 current->rcu_read_unlock_special &= ~RCU_READ_UNLOCK_NEED_QS;
150
151 /*
152 * If there is no GP, or if blocked readers are still blocking GP,
153 * then there is nothing more to do.
154 */
155 if (!rcu_preempt_gp_in_progress() || rcu_preempt_blocked_readers_cgp())
156 return;
157
158 /* Advance callbacks. */
159 rcu_preempt_ctrlblk.completed = rcu_preempt_ctrlblk.gpnum;
160 rcu_preempt_ctrlblk.rcb.donetail = rcu_preempt_ctrlblk.rcb.curtail;
161 rcu_preempt_ctrlblk.rcb.curtail = rcu_preempt_ctrlblk.nexttail;
162
163 /* If there are no blocked readers, next GP is done instantly. */
164 if (!rcu_preempt_blocked_readers_any())
165 rcu_preempt_ctrlblk.rcb.donetail = rcu_preempt_ctrlblk.nexttail;
166
167 /* If there are done callbacks, make RCU_SOFTIRQ process them. */
168 if (*rcu_preempt_ctrlblk.rcb.donetail != NULL)
169 raise_softirq(RCU_SOFTIRQ);
170}
171
172/*
173 * Start a new RCU grace period if warranted. Hard irqs must be disabled.
174 */
175static void rcu_preempt_start_gp(void)
176{
177 if (!rcu_preempt_gp_in_progress() && rcu_preempt_needs_another_gp()) {
178
179 /* Official start of GP. */
180 rcu_preempt_ctrlblk.gpnum++;
181
182 /* Any blocked RCU readers block new GP. */
183 if (rcu_preempt_blocked_readers_any())
184 rcu_preempt_ctrlblk.gp_tasks =
185 rcu_preempt_ctrlblk.blkd_tasks.next;
186
187 /* If there is no running reader, CPU is done with GP. */
188 if (!rcu_preempt_running_reader())
189 rcu_preempt_cpu_qs();
190 }
191}
192
193/*
194 * We have entered the scheduler, and the current task might soon be
195 * context-switched away from. If this task is in an RCU read-side
196 * critical section, we will no longer be able to rely on the CPU to
197 * record that fact, so we enqueue the task on the blkd_tasks list.
198 * If the task started after the current grace period began, as recorded
199 * by ->gpcpu, we enqueue at the beginning of the list. Otherwise
200 * before the element referenced by ->gp_tasks (or at the tail if
201 * ->gp_tasks is NULL) and point ->gp_tasks at the newly added element.
202 * The task will dequeue itself when it exits the outermost enclosing
203 * RCU read-side critical section. Therefore, the current grace period
204 * cannot be permitted to complete until the ->gp_tasks pointer becomes
205 * NULL.
206 *
207 * Caller must disable preemption.
208 */
209void rcu_preempt_note_context_switch(void)
210{
211 struct task_struct *t = current;
212 unsigned long flags;
213
214 local_irq_save(flags); /* must exclude scheduler_tick(). */
215 if (rcu_preempt_running_reader() &&
216 (t->rcu_read_unlock_special & RCU_READ_UNLOCK_BLOCKED) == 0) {
217
218 /* Possibly blocking in an RCU read-side critical section. */
219 t->rcu_read_unlock_special |= RCU_READ_UNLOCK_BLOCKED;
220
221 /*
222 * If this CPU has already checked in, then this task
223 * will hold up the next grace period rather than the
224 * current grace period. Queue the task accordingly.
225 * If the task is queued for the current grace period
226 * (i.e., this CPU has not yet passed through a quiescent
227 * state for the current grace period), then as long
228 * as that task remains queued, the current grace period
229 * cannot end.
230 */
231 list_add(&t->rcu_node_entry, &rcu_preempt_ctrlblk.blkd_tasks);
232 if (rcu_cpu_blocking_cur_gp())
233 rcu_preempt_ctrlblk.gp_tasks = &t->rcu_node_entry;
234 }
235
236 /*
237 * Either we were not in an RCU read-side critical section to
238 * begin with, or we have now recorded that critical section
239 * globally. Either way, we can now note a quiescent state
240 * for this CPU. Again, if we were in an RCU read-side critical
241 * section, and if that critical section was blocking the current
242 * grace period, then the fact that the task has been enqueued
243 * means that current grace period continues to be blocked.
244 */
245 rcu_preempt_cpu_qs();
246 local_irq_restore(flags);
247}
248
249/*
250 * Tiny-preemptible RCU implementation for rcu_read_lock().
251 * Just increment ->rcu_read_lock_nesting, shared state will be updated
252 * if we block.
253 */
254void __rcu_read_lock(void)
255{
256 current->rcu_read_lock_nesting++;
257 barrier(); /* needed if we ever invoke rcu_read_lock in rcutiny.c */
258}
259EXPORT_SYMBOL_GPL(__rcu_read_lock);
260
261/*
262 * Handle special cases during rcu_read_unlock(), such as needing to
263 * notify RCU core processing or task having blocked during the RCU
264 * read-side critical section.
265 */
266static void rcu_read_unlock_special(struct task_struct *t)
267{
268 int empty;
269 int empty_exp;
270 unsigned long flags;
271 struct list_head *np;
272 int special;
273
274 /*
275 * NMI handlers cannot block and cannot safely manipulate state.
276 * They therefore cannot possibly be special, so just leave.
277 */
278 if (in_nmi())
279 return;
280
281 local_irq_save(flags);
282
283 /*
284 * If RCU core is waiting for this CPU to exit critical section,
285 * let it know that we have done so.
286 */
287 special = t->rcu_read_unlock_special;
288 if (special & RCU_READ_UNLOCK_NEED_QS)
289 rcu_preempt_cpu_qs();
290
291 /* Hardware IRQ handlers cannot block. */
292 if (in_irq()) {
293 local_irq_restore(flags);
294 return;
295 }
296
297 /* Clean up if blocked during RCU read-side critical section. */
298 if (special & RCU_READ_UNLOCK_BLOCKED) {
299 t->rcu_read_unlock_special &= ~RCU_READ_UNLOCK_BLOCKED;
300
301 /*
302 * Remove this task from the ->blkd_tasks list and adjust
303 * any pointers that might have been referencing it.
304 */
305 empty = !rcu_preempt_blocked_readers_cgp();
306 empty_exp = rcu_preempt_ctrlblk.exp_tasks == NULL;
307 np = t->rcu_node_entry.next;
308 if (np == &rcu_preempt_ctrlblk.blkd_tasks)
309 np = NULL;
310 list_del(&t->rcu_node_entry);
311 if (&t->rcu_node_entry == rcu_preempt_ctrlblk.gp_tasks)
312 rcu_preempt_ctrlblk.gp_tasks = np;
313 if (&t->rcu_node_entry == rcu_preempt_ctrlblk.exp_tasks)
314 rcu_preempt_ctrlblk.exp_tasks = np;
315 INIT_LIST_HEAD(&t->rcu_node_entry);
316
317 /*
318 * If this was the last task on the current list, and if
319 * we aren't waiting on the CPU, report the quiescent state
320 * and start a new grace period if needed.
321 */
322 if (!empty && !rcu_preempt_blocked_readers_cgp()) {
323 rcu_preempt_cpu_qs();
324 rcu_preempt_start_gp();
325 }
326
327 /*
328 * If this was the last task on the expedited lists,
329 * then we need wake up the waiting task.
330 */
331 if (!empty_exp && rcu_preempt_ctrlblk.exp_tasks == NULL)
332 rcu_report_exp_done();
333 }
334 local_irq_restore(flags);
335}
336
337/*
338 * Tiny-preemptible RCU implementation for rcu_read_unlock().
339 * Decrement ->rcu_read_lock_nesting. If the result is zero (outermost
340 * rcu_read_unlock()) and ->rcu_read_unlock_special is non-zero, then
341 * invoke rcu_read_unlock_special() to clean up after a context switch
342 * in an RCU read-side critical section and other special cases.
343 */
344void __rcu_read_unlock(void)
345{
346 struct task_struct *t = current;
347
348 barrier(); /* needed if we ever invoke rcu_read_unlock in rcutiny.c */
349 --t->rcu_read_lock_nesting;
350 barrier(); /* decrement before load of ->rcu_read_unlock_special */
351 if (t->rcu_read_lock_nesting == 0 &&
352 unlikely(ACCESS_ONCE(t->rcu_read_unlock_special)))
353 rcu_read_unlock_special(t);
354#ifdef CONFIG_PROVE_LOCKING
355 WARN_ON_ONCE(t->rcu_read_lock_nesting < 0);
356#endif /* #ifdef CONFIG_PROVE_LOCKING */
357}
358EXPORT_SYMBOL_GPL(__rcu_read_unlock);
359
360/*
361 * Check for a quiescent state from the current CPU. When a task blocks,
362 * the task is recorded in the rcu_preempt_ctrlblk structure, which is
363 * checked elsewhere. This is called from the scheduling-clock interrupt.
364 *
365 * Caller must disable hard irqs.
366 */
367static void rcu_preempt_check_callbacks(void)
368{
369 struct task_struct *t = current;
370
371 if (rcu_preempt_gp_in_progress() &&
372 (!rcu_preempt_running_reader() ||
373 !rcu_cpu_blocking_cur_gp()))
374 rcu_preempt_cpu_qs();
375 if (&rcu_preempt_ctrlblk.rcb.rcucblist !=
376 rcu_preempt_ctrlblk.rcb.donetail)
377 raise_softirq(RCU_SOFTIRQ);
378 if (rcu_preempt_gp_in_progress() &&
379 rcu_cpu_blocking_cur_gp() &&
380 rcu_preempt_running_reader())
381 t->rcu_read_unlock_special |= RCU_READ_UNLOCK_NEED_QS;
382}
383
384/*
385 * TINY_PREEMPT_RCU has an extra callback-list tail pointer to
386 * update, so this is invoked from __rcu_process_callbacks() to
387 * handle that case. Of course, it is invoked for all flavors of
388 * RCU, but RCU callbacks can appear only on one of the lists, and
389 * neither ->nexttail nor ->donetail can possibly be NULL, so there
390 * is no need for an explicit check.
391 */
392static void rcu_preempt_remove_callbacks(struct rcu_ctrlblk *rcp)
393{
394 if (rcu_preempt_ctrlblk.nexttail == rcp->donetail)
395 rcu_preempt_ctrlblk.nexttail = &rcp->rcucblist;
396}
397
398/*
399 * Process callbacks for preemptible RCU.
400 */
401static void rcu_preempt_process_callbacks(void)
402{
403 __rcu_process_callbacks(&rcu_preempt_ctrlblk.rcb);
404}
405
406/*
407 * Queue a preemptible -RCU callback for invocation after a grace period.
408 */
409void call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu))
410{
411 unsigned long flags;
412
413 debug_rcu_head_queue(head);
414 head->func = func;
415 head->next = NULL;
416
417 local_irq_save(flags);
418 *rcu_preempt_ctrlblk.nexttail = head;
419 rcu_preempt_ctrlblk.nexttail = &head->next;
420 rcu_preempt_start_gp(); /* checks to see if GP needed. */
421 local_irq_restore(flags);
422}
423EXPORT_SYMBOL_GPL(call_rcu);
424
425void rcu_barrier(void)
426{
427 struct rcu_synchronize rcu;
428
429 init_rcu_head_on_stack(&rcu.head);
430 init_completion(&rcu.completion);
431 /* Will wake me after RCU finished. */
432 call_rcu(&rcu.head, wakeme_after_rcu);
433 /* Wait for it. */
434 wait_for_completion(&rcu.completion);
435 destroy_rcu_head_on_stack(&rcu.head);
436}
437EXPORT_SYMBOL_GPL(rcu_barrier);
438
439/*
440 * synchronize_rcu - wait until a grace period has elapsed.
441 *
442 * Control will return to the caller some time after a full grace
443 * period has elapsed, in other words after all currently executing RCU
444 * read-side critical sections have completed. RCU read-side critical
445 * sections are delimited by rcu_read_lock() and rcu_read_unlock(),
446 * and may be nested.
447 */
448void synchronize_rcu(void)
449{
450#ifdef CONFIG_DEBUG_LOCK_ALLOC
451 if (!rcu_scheduler_active)
452 return;
453#endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
454
455 WARN_ON_ONCE(rcu_preempt_running_reader());
456 if (!rcu_preempt_blocked_readers_any())
457 return;
458
459 /* Once we get past the fastpath checks, same code as rcu_barrier(). */
460 rcu_barrier();
461}
462EXPORT_SYMBOL_GPL(synchronize_rcu);
463
464static DECLARE_WAIT_QUEUE_HEAD(sync_rcu_preempt_exp_wq);
465static unsigned long sync_rcu_preempt_exp_count;
466static DEFINE_MUTEX(sync_rcu_preempt_exp_mutex);
467
468/*
469 * Return non-zero if there are any tasks in RCU read-side critical
470 * sections blocking the current preemptible-RCU expedited grace period.
471 * If there is no preemptible-RCU expedited grace period currently in
472 * progress, returns zero unconditionally.
473 */
474static int rcu_preempted_readers_exp(void)
475{
476 return rcu_preempt_ctrlblk.exp_tasks != NULL;
477}
478
479/*
480 * Report the exit from RCU read-side critical section for the last task
481 * that queued itself during or before the current expedited preemptible-RCU
482 * grace period.
483 */
484static void rcu_report_exp_done(void)
485{
486 wake_up(&sync_rcu_preempt_exp_wq);
487}
488
489/*
490 * Wait for an rcu-preempt grace period, but expedite it. The basic idea
491 * is to rely in the fact that there is but one CPU, and that it is
492 * illegal for a task to invoke synchronize_rcu_expedited() while in a
493 * preemptible-RCU read-side critical section. Therefore, any such
494 * critical sections must correspond to blocked tasks, which must therefore
495 * be on the ->blkd_tasks list. So just record the current head of the
496 * list in the ->exp_tasks pointer, and wait for all tasks including and
497 * after the task pointed to by ->exp_tasks to drain.
498 */
499void synchronize_rcu_expedited(void)
500{
501 unsigned long flags;
502 struct rcu_preempt_ctrlblk *rpcp = &rcu_preempt_ctrlblk;
503 unsigned long snap;
504
505 barrier(); /* ensure prior action seen before grace period. */
506
507 WARN_ON_ONCE(rcu_preempt_running_reader());
508
509 /*
510 * Acquire lock so that there is only one preemptible RCU grace
511 * period in flight. Of course, if someone does the expedited
512 * grace period for us while we are acquiring the lock, just leave.
513 */
514 snap = sync_rcu_preempt_exp_count + 1;
515 mutex_lock(&sync_rcu_preempt_exp_mutex);
516 if (ULONG_CMP_LT(snap, sync_rcu_preempt_exp_count))
517 goto unlock_mb_ret; /* Others did our work for us. */
518
519 local_irq_save(flags);
520
521 /*
522 * All RCU readers have to already be on blkd_tasks because
523 * we cannot legally be executing in an RCU read-side critical
524 * section.
525 */
526
527 /* Snapshot current head of ->blkd_tasks list. */
528 rpcp->exp_tasks = rpcp->blkd_tasks.next;
529 if (rpcp->exp_tasks == &rpcp->blkd_tasks)
530 rpcp->exp_tasks = NULL;
531 local_irq_restore(flags);
532
533 /* Wait for tail of ->blkd_tasks list to drain. */
534 if (rcu_preempted_readers_exp())
535 wait_event(sync_rcu_preempt_exp_wq,
536 !rcu_preempted_readers_exp());
537
538 /* Clean up and exit. */
539 barrier(); /* ensure expedited GP seen before counter increment. */
540 sync_rcu_preempt_exp_count++;
541unlock_mb_ret:
542 mutex_unlock(&sync_rcu_preempt_exp_mutex);
543 barrier(); /* ensure subsequent action seen after grace period. */
544}
545EXPORT_SYMBOL_GPL(synchronize_rcu_expedited);
546
547/*
548 * Does preemptible RCU need the CPU to stay out of dynticks mode?
549 */
550int rcu_preempt_needs_cpu(void)
551{
552 if (!rcu_preempt_running_reader())
553 rcu_preempt_cpu_qs();
554 return rcu_preempt_ctrlblk.rcb.rcucblist != NULL;
555}
556
557/*
558 * Check for a task exiting while in a preemptible -RCU read-side
559 * critical section, clean up if so. No need to issue warnings,
560 * as debug_check_no_locks_held() already does this if lockdep
561 * is enabled.
562 */
563void exit_rcu(void)
564{
565 struct task_struct *t = current;
566
567 if (t->rcu_read_lock_nesting == 0)
568 return;
569 t->rcu_read_lock_nesting = 1;
570 rcu_read_unlock();
571}
572
573#else /* #ifdef CONFIG_TINY_PREEMPT_RCU */
574
575/*
576 * Because preemptible RCU does not exist, it never has any callbacks
577 * to check.
578 */
579static void rcu_preempt_check_callbacks(void)
580{
581}
582
583/*
584 * Because preemptible RCU does not exist, it never has any callbacks
585 * to remove.
586 */
587static void rcu_preempt_remove_callbacks(struct rcu_ctrlblk *rcp)
588{
589}
590
591/*
592 * Because preemptible RCU does not exist, it never has any callbacks
593 * to process.
594 */
595static void rcu_preempt_process_callbacks(void)
596{
597}
598
599#endif /* #else #ifdef CONFIG_TINY_PREEMPT_RCU */
600
25#ifdef CONFIG_DEBUG_LOCK_ALLOC 601#ifdef CONFIG_DEBUG_LOCK_ALLOC
26 602
27#include <linux/kernel_stat.h> 603#include <linux/kernel_stat.h>
diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index 2e2726d790b9..9d8e8fb2515f 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -120,7 +120,7 @@ struct rcu_torture {
120}; 120};
121 121
122static LIST_HEAD(rcu_torture_freelist); 122static LIST_HEAD(rcu_torture_freelist);
123static struct rcu_torture *rcu_torture_current; 123static struct rcu_torture __rcu *rcu_torture_current;
124static long rcu_torture_current_version; 124static long rcu_torture_current_version;
125static struct rcu_torture rcu_tortures[10 * RCU_TORTURE_PIPE_LEN]; 125static struct rcu_torture rcu_tortures[10 * RCU_TORTURE_PIPE_LEN];
126static DEFINE_SPINLOCK(rcu_torture_lock); 126static DEFINE_SPINLOCK(rcu_torture_lock);
@@ -153,8 +153,10 @@ int rcutorture_runnable = RCUTORTURE_RUNNABLE_INIT;
153#define FULLSTOP_SHUTDOWN 1 /* System shutdown with rcutorture running. */ 153#define FULLSTOP_SHUTDOWN 1 /* System shutdown with rcutorture running. */
154#define FULLSTOP_RMMOD 2 /* Normal rmmod of rcutorture. */ 154#define FULLSTOP_RMMOD 2 /* Normal rmmod of rcutorture. */
155static int fullstop = FULLSTOP_RMMOD; 155static int fullstop = FULLSTOP_RMMOD;
156DEFINE_MUTEX(fullstop_mutex); /* Protect fullstop transitions and spawning */ 156/*
157 /* of kthreads. */ 157 * Protect fullstop transitions and spawning of kthreads.
158 */
159static DEFINE_MUTEX(fullstop_mutex);
158 160
159/* 161/*
160 * Detect and respond to a system shutdown. 162 * Detect and respond to a system shutdown.
@@ -303,6 +305,10 @@ static void rcu_read_delay(struct rcu_random_state *rrsp)
303 mdelay(longdelay_ms); 305 mdelay(longdelay_ms);
304 if (!(rcu_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) 306 if (!(rcu_random(rrsp) % (nrealreaders * 2 * shortdelay_us)))
305 udelay(shortdelay_us); 307 udelay(shortdelay_us);
308#ifdef CONFIG_PREEMPT
309 if (!preempt_count() && !(rcu_random(rrsp) % (nrealreaders * 20000)))
310 preempt_schedule(); /* No QS if preempt_disable() in effect */
311#endif
306} 312}
307 313
308static void rcu_torture_read_unlock(int idx) __releases(RCU) 314static void rcu_torture_read_unlock(int idx) __releases(RCU)
@@ -536,6 +542,8 @@ static void srcu_read_delay(struct rcu_random_state *rrsp)
536 delay = rcu_random(rrsp) % (nrealreaders * 2 * longdelay * uspertick); 542 delay = rcu_random(rrsp) % (nrealreaders * 2 * longdelay * uspertick);
537 if (!delay) 543 if (!delay)
538 schedule_timeout_interruptible(longdelay); 544 schedule_timeout_interruptible(longdelay);
545 else
546 rcu_read_delay(rrsp);
539} 547}
540 548
541static void srcu_torture_read_unlock(int idx) __releases(&srcu_ctl) 549static void srcu_torture_read_unlock(int idx) __releases(&srcu_ctl)
@@ -731,7 +739,8 @@ rcu_torture_writer(void *arg)
731 continue; 739 continue;
732 rp->rtort_pipe_count = 0; 740 rp->rtort_pipe_count = 0;
733 udelay(rcu_random(&rand) & 0x3ff); 741 udelay(rcu_random(&rand) & 0x3ff);
734 old_rp = rcu_torture_current; 742 old_rp = rcu_dereference_check(rcu_torture_current,
743 current == writer_task);
735 rp->rtort_mbtest = 1; 744 rp->rtort_mbtest = 1;
736 rcu_assign_pointer(rcu_torture_current, rp); 745 rcu_assign_pointer(rcu_torture_current, rp);
737 smp_wmb(); /* Mods to old_rp must follow rcu_assign_pointer() */ 746 smp_wmb(); /* Mods to old_rp must follow rcu_assign_pointer() */
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index d5bc43976c5a..ccdc04c47981 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -143,6 +143,11 @@ module_param(blimit, int, 0);
143module_param(qhimark, int, 0); 143module_param(qhimark, int, 0);
144module_param(qlowmark, int, 0); 144module_param(qlowmark, int, 0);
145 145
146#ifdef CONFIG_RCU_CPU_STALL_DETECTOR
147int rcu_cpu_stall_suppress __read_mostly = RCU_CPU_STALL_SUPPRESS_INIT;
148module_param(rcu_cpu_stall_suppress, int, 0644);
149#endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
150
146static void force_quiescent_state(struct rcu_state *rsp, int relaxed); 151static void force_quiescent_state(struct rcu_state *rsp, int relaxed);
147static int rcu_pending(int cpu); 152static int rcu_pending(int cpu);
148 153
@@ -450,7 +455,7 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp)
450 455
451#ifdef CONFIG_RCU_CPU_STALL_DETECTOR 456#ifdef CONFIG_RCU_CPU_STALL_DETECTOR
452 457
453int rcu_cpu_stall_panicking __read_mostly; 458int rcu_cpu_stall_suppress __read_mostly;
454 459
455static void record_gp_stall_check_time(struct rcu_state *rsp) 460static void record_gp_stall_check_time(struct rcu_state *rsp)
456{ 461{
@@ -482,8 +487,11 @@ static void print_other_cpu_stall(struct rcu_state *rsp)
482 rcu_print_task_stall(rnp); 487 rcu_print_task_stall(rnp);
483 raw_spin_unlock_irqrestore(&rnp->lock, flags); 488 raw_spin_unlock_irqrestore(&rnp->lock, flags);
484 489
485 /* OK, time to rat on our buddy... */ 490 /*
486 491 * OK, time to rat on our buddy...
492 * See Documentation/RCU/stallwarn.txt for info on how to debug
493 * RCU CPU stall warnings.
494 */
487 printk(KERN_ERR "INFO: %s detected stalls on CPUs/tasks: {", 495 printk(KERN_ERR "INFO: %s detected stalls on CPUs/tasks: {",
488 rsp->name); 496 rsp->name);
489 rcu_for_each_leaf_node(rsp, rnp) { 497 rcu_for_each_leaf_node(rsp, rnp) {
@@ -512,6 +520,11 @@ static void print_cpu_stall(struct rcu_state *rsp)
512 unsigned long flags; 520 unsigned long flags;
513 struct rcu_node *rnp = rcu_get_root(rsp); 521 struct rcu_node *rnp = rcu_get_root(rsp);
514 522
523 /*
524 * OK, time to rat on ourselves...
525 * See Documentation/RCU/stallwarn.txt for info on how to debug
526 * RCU CPU stall warnings.
527 */
515 printk(KERN_ERR "INFO: %s detected stall on CPU %d (t=%lu jiffies)\n", 528 printk(KERN_ERR "INFO: %s detected stall on CPU %d (t=%lu jiffies)\n",
516 rsp->name, smp_processor_id(), jiffies - rsp->gp_start); 529 rsp->name, smp_processor_id(), jiffies - rsp->gp_start);
517 trigger_all_cpu_backtrace(); 530 trigger_all_cpu_backtrace();
@@ -530,11 +543,11 @@ static void check_cpu_stall(struct rcu_state *rsp, struct rcu_data *rdp)
530 long delta; 543 long delta;
531 struct rcu_node *rnp; 544 struct rcu_node *rnp;
532 545
533 if (rcu_cpu_stall_panicking) 546 if (rcu_cpu_stall_suppress)
534 return; 547 return;
535 delta = jiffies - rsp->jiffies_stall; 548 delta = jiffies - ACCESS_ONCE(rsp->jiffies_stall);
536 rnp = rdp->mynode; 549 rnp = rdp->mynode;
537 if ((rnp->qsmask & rdp->grpmask) && delta >= 0) { 550 if ((ACCESS_ONCE(rnp->qsmask) & rdp->grpmask) && delta >= 0) {
538 551
539 /* We haven't checked in, so go dump stack. */ 552 /* We haven't checked in, so go dump stack. */
540 print_cpu_stall(rsp); 553 print_cpu_stall(rsp);
@@ -548,10 +561,26 @@ static void check_cpu_stall(struct rcu_state *rsp, struct rcu_data *rdp)
548 561
549static int rcu_panic(struct notifier_block *this, unsigned long ev, void *ptr) 562static int rcu_panic(struct notifier_block *this, unsigned long ev, void *ptr)
550{ 563{
551 rcu_cpu_stall_panicking = 1; 564 rcu_cpu_stall_suppress = 1;
552 return NOTIFY_DONE; 565 return NOTIFY_DONE;
553} 566}
554 567
568/**
569 * rcu_cpu_stall_reset - prevent further stall warnings in current grace period
570 *
571 * Set the stall-warning timeout way off into the future, thus preventing
572 * any RCU CPU stall-warning messages from appearing in the current set of
573 * RCU grace periods.
574 *
575 * The caller must disable hard irqs.
576 */
577void rcu_cpu_stall_reset(void)
578{
579 rcu_sched_state.jiffies_stall = jiffies + ULONG_MAX / 2;
580 rcu_bh_state.jiffies_stall = jiffies + ULONG_MAX / 2;
581 rcu_preempt_stall_reset();
582}
583
555static struct notifier_block rcu_panic_block = { 584static struct notifier_block rcu_panic_block = {
556 .notifier_call = rcu_panic, 585 .notifier_call = rcu_panic,
557}; 586};
@@ -571,6 +600,10 @@ static void check_cpu_stall(struct rcu_state *rsp, struct rcu_data *rdp)
571{ 600{
572} 601}
573 602
603void rcu_cpu_stall_reset(void)
604{
605}
606
574static void __init check_cpu_stall_init(void) 607static void __init check_cpu_stall_init(void)
575{ 608{
576} 609}
@@ -712,7 +745,7 @@ static void
712rcu_start_gp(struct rcu_state *rsp, unsigned long flags) 745rcu_start_gp(struct rcu_state *rsp, unsigned long flags)
713 __releases(rcu_get_root(rsp)->lock) 746 __releases(rcu_get_root(rsp)->lock)
714{ 747{
715 struct rcu_data *rdp = rsp->rda[smp_processor_id()]; 748 struct rcu_data *rdp = this_cpu_ptr(rsp->rda);
716 struct rcu_node *rnp = rcu_get_root(rsp); 749 struct rcu_node *rnp = rcu_get_root(rsp);
717 750
718 if (!cpu_needs_another_gp(rsp, rdp) || rsp->fqs_active) { 751 if (!cpu_needs_another_gp(rsp, rdp) || rsp->fqs_active) {
@@ -960,7 +993,7 @@ rcu_check_quiescent_state(struct rcu_state *rsp, struct rcu_data *rdp)
960static void rcu_send_cbs_to_orphanage(struct rcu_state *rsp) 993static void rcu_send_cbs_to_orphanage(struct rcu_state *rsp)
961{ 994{
962 int i; 995 int i;
963 struct rcu_data *rdp = rsp->rda[smp_processor_id()]; 996 struct rcu_data *rdp = this_cpu_ptr(rsp->rda);
964 997
965 if (rdp->nxtlist == NULL) 998 if (rdp->nxtlist == NULL)
966 return; /* irqs disabled, so comparison is stable. */ 999 return; /* irqs disabled, so comparison is stable. */
@@ -971,6 +1004,7 @@ static void rcu_send_cbs_to_orphanage(struct rcu_state *rsp)
971 for (i = 0; i < RCU_NEXT_SIZE; i++) 1004 for (i = 0; i < RCU_NEXT_SIZE; i++)
972 rdp->nxttail[i] = &rdp->nxtlist; 1005 rdp->nxttail[i] = &rdp->nxtlist;
973 rsp->orphan_qlen += rdp->qlen; 1006 rsp->orphan_qlen += rdp->qlen;
1007 rdp->n_cbs_orphaned += rdp->qlen;
974 rdp->qlen = 0; 1008 rdp->qlen = 0;
975 raw_spin_unlock(&rsp->onofflock); /* irqs remain disabled. */ 1009 raw_spin_unlock(&rsp->onofflock); /* irqs remain disabled. */
976} 1010}
@@ -984,7 +1018,7 @@ static void rcu_adopt_orphan_cbs(struct rcu_state *rsp)
984 struct rcu_data *rdp; 1018 struct rcu_data *rdp;
985 1019
986 raw_spin_lock_irqsave(&rsp->onofflock, flags); 1020 raw_spin_lock_irqsave(&rsp->onofflock, flags);
987 rdp = rsp->rda[smp_processor_id()]; 1021 rdp = this_cpu_ptr(rsp->rda);
988 if (rsp->orphan_cbs_list == NULL) { 1022 if (rsp->orphan_cbs_list == NULL) {
989 raw_spin_unlock_irqrestore(&rsp->onofflock, flags); 1023 raw_spin_unlock_irqrestore(&rsp->onofflock, flags);
990 return; 1024 return;
@@ -992,6 +1026,7 @@ static void rcu_adopt_orphan_cbs(struct rcu_state *rsp)
992 *rdp->nxttail[RCU_NEXT_TAIL] = rsp->orphan_cbs_list; 1026 *rdp->nxttail[RCU_NEXT_TAIL] = rsp->orphan_cbs_list;
993 rdp->nxttail[RCU_NEXT_TAIL] = rsp->orphan_cbs_tail; 1027 rdp->nxttail[RCU_NEXT_TAIL] = rsp->orphan_cbs_tail;
994 rdp->qlen += rsp->orphan_qlen; 1028 rdp->qlen += rsp->orphan_qlen;
1029 rdp->n_cbs_adopted += rsp->orphan_qlen;
995 rsp->orphan_cbs_list = NULL; 1030 rsp->orphan_cbs_list = NULL;
996 rsp->orphan_cbs_tail = &rsp->orphan_cbs_list; 1031 rsp->orphan_cbs_tail = &rsp->orphan_cbs_list;
997 rsp->orphan_qlen = 0; 1032 rsp->orphan_qlen = 0;
@@ -1007,7 +1042,7 @@ static void __rcu_offline_cpu(int cpu, struct rcu_state *rsp)
1007 unsigned long flags; 1042 unsigned long flags;
1008 unsigned long mask; 1043 unsigned long mask;
1009 int need_report = 0; 1044 int need_report = 0;
1010 struct rcu_data *rdp = rsp->rda[cpu]; 1045 struct rcu_data *rdp = per_cpu_ptr(rsp->rda, cpu);
1011 struct rcu_node *rnp; 1046 struct rcu_node *rnp;
1012 1047
1013 /* Exclude any attempts to start a new grace period. */ 1048 /* Exclude any attempts to start a new grace period. */
@@ -1123,6 +1158,7 @@ static void rcu_do_batch(struct rcu_state *rsp, struct rcu_data *rdp)
1123 1158
1124 /* Update count, and requeue any remaining callbacks. */ 1159 /* Update count, and requeue any remaining callbacks. */
1125 rdp->qlen -= count; 1160 rdp->qlen -= count;
1161 rdp->n_cbs_invoked += count;
1126 if (list != NULL) { 1162 if (list != NULL) {
1127 *tail = rdp->nxtlist; 1163 *tail = rdp->nxtlist;
1128 rdp->nxtlist = list; 1164 rdp->nxtlist = list;
@@ -1226,7 +1262,8 @@ static void force_qs_rnp(struct rcu_state *rsp, int (*f)(struct rcu_data *))
1226 cpu = rnp->grplo; 1262 cpu = rnp->grplo;
1227 bit = 1; 1263 bit = 1;
1228 for (; cpu <= rnp->grphi; cpu++, bit <<= 1) { 1264 for (; cpu <= rnp->grphi; cpu++, bit <<= 1) {
1229 if ((rnp->qsmask & bit) != 0 && f(rsp->rda[cpu])) 1265 if ((rnp->qsmask & bit) != 0 &&
1266 f(per_cpu_ptr(rsp->rda, cpu)))
1230 mask |= bit; 1267 mask |= bit;
1231 } 1268 }
1232 if (mask != 0) { 1269 if (mask != 0) {
@@ -1402,7 +1439,7 @@ __call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu),
1402 * a quiescent state betweentimes. 1439 * a quiescent state betweentimes.
1403 */ 1440 */
1404 local_irq_save(flags); 1441 local_irq_save(flags);
1405 rdp = rsp->rda[smp_processor_id()]; 1442 rdp = this_cpu_ptr(rsp->rda);
1406 rcu_process_gp_end(rsp, rdp); 1443 rcu_process_gp_end(rsp, rdp);
1407 check_for_new_grace_period(rsp, rdp); 1444 check_for_new_grace_period(rsp, rdp);
1408 1445
@@ -1701,7 +1738,7 @@ rcu_boot_init_percpu_data(int cpu, struct rcu_state *rsp)
1701{ 1738{
1702 unsigned long flags; 1739 unsigned long flags;
1703 int i; 1740 int i;
1704 struct rcu_data *rdp = rsp->rda[cpu]; 1741 struct rcu_data *rdp = per_cpu_ptr(rsp->rda, cpu);
1705 struct rcu_node *rnp = rcu_get_root(rsp); 1742 struct rcu_node *rnp = rcu_get_root(rsp);
1706 1743
1707 /* Set up local state, ensuring consistent view of global state. */ 1744 /* Set up local state, ensuring consistent view of global state. */
@@ -1729,7 +1766,7 @@ rcu_init_percpu_data(int cpu, struct rcu_state *rsp, int preemptable)
1729{ 1766{
1730 unsigned long flags; 1767 unsigned long flags;
1731 unsigned long mask; 1768 unsigned long mask;
1732 struct rcu_data *rdp = rsp->rda[cpu]; 1769 struct rcu_data *rdp = per_cpu_ptr(rsp->rda, cpu);
1733 struct rcu_node *rnp = rcu_get_root(rsp); 1770 struct rcu_node *rnp = rcu_get_root(rsp);
1734 1771
1735 /* Set up local state, ensuring consistent view of global state. */ 1772 /* Set up local state, ensuring consistent view of global state. */
@@ -1865,7 +1902,8 @@ static void __init rcu_init_levelspread(struct rcu_state *rsp)
1865/* 1902/*
1866 * Helper function for rcu_init() that initializes one rcu_state structure. 1903 * Helper function for rcu_init() that initializes one rcu_state structure.
1867 */ 1904 */
1868static void __init rcu_init_one(struct rcu_state *rsp) 1905static void __init rcu_init_one(struct rcu_state *rsp,
1906 struct rcu_data __percpu *rda)
1869{ 1907{
1870 static char *buf[] = { "rcu_node_level_0", 1908 static char *buf[] = { "rcu_node_level_0",
1871 "rcu_node_level_1", 1909 "rcu_node_level_1",
@@ -1918,37 +1956,23 @@ static void __init rcu_init_one(struct rcu_state *rsp)
1918 } 1956 }
1919 } 1957 }
1920 1958
1959 rsp->rda = rda;
1921 rnp = rsp->level[NUM_RCU_LVLS - 1]; 1960 rnp = rsp->level[NUM_RCU_LVLS - 1];
1922 for_each_possible_cpu(i) { 1961 for_each_possible_cpu(i) {
1923 while (i > rnp->grphi) 1962 while (i > rnp->grphi)
1924 rnp++; 1963 rnp++;
1925 rsp->rda[i]->mynode = rnp; 1964 per_cpu_ptr(rsp->rda, i)->mynode = rnp;
1926 rcu_boot_init_percpu_data(i, rsp); 1965 rcu_boot_init_percpu_data(i, rsp);
1927 } 1966 }
1928} 1967}
1929 1968
1930/*
1931 * Helper macro for __rcu_init() and __rcu_init_preempt(). To be used
1932 * nowhere else! Assigns leaf node pointers into each CPU's rcu_data
1933 * structure.
1934 */
1935#define RCU_INIT_FLAVOR(rsp, rcu_data) \
1936do { \
1937 int i; \
1938 \
1939 for_each_possible_cpu(i) { \
1940 (rsp)->rda[i] = &per_cpu(rcu_data, i); \
1941 } \
1942 rcu_init_one(rsp); \
1943} while (0)
1944
1945void __init rcu_init(void) 1969void __init rcu_init(void)
1946{ 1970{
1947 int cpu; 1971 int cpu;
1948 1972
1949 rcu_bootup_announce(); 1973 rcu_bootup_announce();
1950 RCU_INIT_FLAVOR(&rcu_sched_state, rcu_sched_data); 1974 rcu_init_one(&rcu_sched_state, &rcu_sched_data);
1951 RCU_INIT_FLAVOR(&rcu_bh_state, rcu_bh_data); 1975 rcu_init_one(&rcu_bh_state, &rcu_bh_data);
1952 __rcu_init_preempt(); 1976 __rcu_init_preempt();
1953 open_softirq(RCU_SOFTIRQ, rcu_process_callbacks); 1977 open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);
1954 1978
diff --git a/kernel/rcutree.h b/kernel/rcutree.h
index 14c040b18ed0..91d4170c5c13 100644
--- a/kernel/rcutree.h
+++ b/kernel/rcutree.h
@@ -202,6 +202,9 @@ struct rcu_data {
202 long qlen; /* # of queued callbacks */ 202 long qlen; /* # of queued callbacks */
203 long qlen_last_fqs_check; 203 long qlen_last_fqs_check;
204 /* qlen at last check for QS forcing */ 204 /* qlen at last check for QS forcing */
205 unsigned long n_cbs_invoked; /* count of RCU cbs invoked. */
206 unsigned long n_cbs_orphaned; /* RCU cbs sent to orphanage. */
207 unsigned long n_cbs_adopted; /* RCU cbs adopted from orphanage. */
205 unsigned long n_force_qs_snap; 208 unsigned long n_force_qs_snap;
206 /* did other CPU force QS recently? */ 209 /* did other CPU force QS recently? */
207 long blimit; /* Upper limit on a processed batch */ 210 long blimit; /* Upper limit on a processed batch */
@@ -254,19 +257,23 @@ struct rcu_data {
254#define RCU_STALL_DELAY_DELTA 0 257#define RCU_STALL_DELAY_DELTA 0
255#endif 258#endif
256 259
257#define RCU_SECONDS_TILL_STALL_CHECK (10 * HZ + RCU_STALL_DELAY_DELTA) 260#define RCU_SECONDS_TILL_STALL_CHECK (CONFIG_RCU_CPU_STALL_TIMEOUT * HZ + \
261 RCU_STALL_DELAY_DELTA)
258 /* for rsp->jiffies_stall */ 262 /* for rsp->jiffies_stall */
259#define RCU_SECONDS_TILL_STALL_RECHECK (30 * HZ + RCU_STALL_DELAY_DELTA) 263#define RCU_SECONDS_TILL_STALL_RECHECK (3 * RCU_SECONDS_TILL_STALL_CHECK + 30)
260 /* for rsp->jiffies_stall */ 264 /* for rsp->jiffies_stall */
261#define RCU_STALL_RAT_DELAY 2 /* Allow other CPUs time */ 265#define RCU_STALL_RAT_DELAY 2 /* Allow other CPUs time */
262 /* to take at least one */ 266 /* to take at least one */
263 /* scheduling clock irq */ 267 /* scheduling clock irq */
264 /* before ratting on them. */ 268 /* before ratting on them. */
265 269
266#endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */ 270#ifdef CONFIG_RCU_CPU_STALL_DETECTOR_RUNNABLE
271#define RCU_CPU_STALL_SUPPRESS_INIT 0
272#else
273#define RCU_CPU_STALL_SUPPRESS_INIT 1
274#endif
267 275
268#define ULONG_CMP_GE(a, b) (ULONG_MAX / 2 >= (a) - (b)) 276#endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
269#define ULONG_CMP_LT(a, b) (ULONG_MAX / 2 < (a) - (b))
270 277
271/* 278/*
272 * RCU global state, including node hierarchy. This hierarchy is 279 * RCU global state, including node hierarchy. This hierarchy is
@@ -283,7 +290,7 @@ struct rcu_state {
283 struct rcu_node *level[NUM_RCU_LVLS]; /* Hierarchy levels. */ 290 struct rcu_node *level[NUM_RCU_LVLS]; /* Hierarchy levels. */
284 u32 levelcnt[MAX_RCU_LVLS + 1]; /* # nodes in each level. */ 291 u32 levelcnt[MAX_RCU_LVLS + 1]; /* # nodes in each level. */
285 u8 levelspread[NUM_RCU_LVLS]; /* kids/node in each level. */ 292 u8 levelspread[NUM_RCU_LVLS]; /* kids/node in each level. */
286 struct rcu_data *rda[NR_CPUS]; /* array of rdp pointers. */ 293 struct rcu_data __percpu *rda; /* pointer of percu rcu_data. */
287 294
288 /* The following fields are guarded by the root rcu_node's lock. */ 295 /* The following fields are guarded by the root rcu_node's lock. */
289 296
@@ -365,6 +372,7 @@ static void rcu_report_unblock_qs_rnp(struct rcu_node *rnp,
365#ifdef CONFIG_RCU_CPU_STALL_DETECTOR 372#ifdef CONFIG_RCU_CPU_STALL_DETECTOR
366static void rcu_print_detail_task_stall(struct rcu_state *rsp); 373static void rcu_print_detail_task_stall(struct rcu_state *rsp);
367static void rcu_print_task_stall(struct rcu_node *rnp); 374static void rcu_print_task_stall(struct rcu_node *rnp);
375static void rcu_preempt_stall_reset(void);
368#endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */ 376#endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
369static void rcu_preempt_check_blocked_tasks(struct rcu_node *rnp); 377static void rcu_preempt_check_blocked_tasks(struct rcu_node *rnp);
370#ifdef CONFIG_HOTPLUG_CPU 378#ifdef CONFIG_HOTPLUG_CPU
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index 0e4f420245d9..71a4147473f9 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -57,7 +57,7 @@ static void __init rcu_bootup_announce_oddness(void)
57 printk(KERN_INFO 57 printk(KERN_INFO
58 "\tRCU-based detection of stalled CPUs is disabled.\n"); 58 "\tRCU-based detection of stalled CPUs is disabled.\n");
59#endif 59#endif
60#ifndef CONFIG_RCU_CPU_STALL_VERBOSE 60#if defined(CONFIG_TREE_PREEMPT_RCU) && !defined(CONFIG_RCU_CPU_STALL_VERBOSE)
61 printk(KERN_INFO "\tVerbose stalled-CPUs detection is disabled.\n"); 61 printk(KERN_INFO "\tVerbose stalled-CPUs detection is disabled.\n");
62#endif 62#endif
63#if NUM_RCU_LVL_4 != 0 63#if NUM_RCU_LVL_4 != 0
@@ -154,7 +154,7 @@ static void rcu_preempt_note_context_switch(int cpu)
154 (t->rcu_read_unlock_special & RCU_READ_UNLOCK_BLOCKED) == 0) { 154 (t->rcu_read_unlock_special & RCU_READ_UNLOCK_BLOCKED) == 0) {
155 155
156 /* Possibly blocking in an RCU read-side critical section. */ 156 /* Possibly blocking in an RCU read-side critical section. */
157 rdp = rcu_preempt_state.rda[cpu]; 157 rdp = per_cpu_ptr(rcu_preempt_state.rda, cpu);
158 rnp = rdp->mynode; 158 rnp = rdp->mynode;
159 raw_spin_lock_irqsave(&rnp->lock, flags); 159 raw_spin_lock_irqsave(&rnp->lock, flags);
160 t->rcu_read_unlock_special |= RCU_READ_UNLOCK_BLOCKED; 160 t->rcu_read_unlock_special |= RCU_READ_UNLOCK_BLOCKED;
@@ -201,7 +201,7 @@ static void rcu_preempt_note_context_switch(int cpu)
201 */ 201 */
202void __rcu_read_lock(void) 202void __rcu_read_lock(void)
203{ 203{
204 ACCESS_ONCE(current->rcu_read_lock_nesting)++; 204 current->rcu_read_lock_nesting++;
205 barrier(); /* needed if we ever invoke rcu_read_lock in rcutree.c */ 205 barrier(); /* needed if we ever invoke rcu_read_lock in rcutree.c */
206} 206}
207EXPORT_SYMBOL_GPL(__rcu_read_lock); 207EXPORT_SYMBOL_GPL(__rcu_read_lock);
@@ -344,7 +344,9 @@ void __rcu_read_unlock(void)
344 struct task_struct *t = current; 344 struct task_struct *t = current;
345 345
346 barrier(); /* needed if we ever invoke rcu_read_unlock in rcutree.c */ 346 barrier(); /* needed if we ever invoke rcu_read_unlock in rcutree.c */
347 if (--ACCESS_ONCE(t->rcu_read_lock_nesting) == 0 && 347 --t->rcu_read_lock_nesting;
348 barrier(); /* decrement before load of ->rcu_read_unlock_special */
349 if (t->rcu_read_lock_nesting == 0 &&
348 unlikely(ACCESS_ONCE(t->rcu_read_unlock_special))) 350 unlikely(ACCESS_ONCE(t->rcu_read_unlock_special)))
349 rcu_read_unlock_special(t); 351 rcu_read_unlock_special(t);
350#ifdef CONFIG_PROVE_LOCKING 352#ifdef CONFIG_PROVE_LOCKING
@@ -417,6 +419,16 @@ static void rcu_print_task_stall(struct rcu_node *rnp)
417 } 419 }
418} 420}
419 421
422/*
423 * Suppress preemptible RCU's CPU stall warnings by pushing the
424 * time of the next stall-warning message comfortably far into the
425 * future.
426 */
427static void rcu_preempt_stall_reset(void)
428{
429 rcu_preempt_state.jiffies_stall = jiffies + ULONG_MAX / 2;
430}
431
420#endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */ 432#endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
421 433
422/* 434/*
@@ -546,9 +558,11 @@ EXPORT_SYMBOL_GPL(call_rcu);
546 * 558 *
547 * Control will return to the caller some time after a full grace 559 * Control will return to the caller some time after a full grace
548 * period has elapsed, in other words after all currently executing RCU 560 * period has elapsed, in other words after all currently executing RCU
549 * read-side critical sections have completed. RCU read-side critical 561 * read-side critical sections have completed. Note, however, that
550 * sections are delimited by rcu_read_lock() and rcu_read_unlock(), 562 * upon return from synchronize_rcu(), the caller might well be executing
551 * and may be nested. 563 * concurrently with new RCU read-side critical sections that began while
564 * synchronize_rcu() was waiting. RCU read-side critical sections are
565 * delimited by rcu_read_lock() and rcu_read_unlock(), and may be nested.
552 */ 566 */
553void synchronize_rcu(void) 567void synchronize_rcu(void)
554{ 568{
@@ -771,7 +785,7 @@ static void rcu_preempt_send_cbs_to_orphanage(void)
771 */ 785 */
772static void __init __rcu_init_preempt(void) 786static void __init __rcu_init_preempt(void)
773{ 787{
774 RCU_INIT_FLAVOR(&rcu_preempt_state, rcu_preempt_data); 788 rcu_init_one(&rcu_preempt_state, &rcu_preempt_data);
775} 789}
776 790
777/* 791/*
@@ -865,6 +879,14 @@ static void rcu_print_task_stall(struct rcu_node *rnp)
865{ 879{
866} 880}
867 881
882/*
883 * Because preemptible RCU does not exist, there is no need to suppress
884 * its CPU stall warnings.
885 */
886static void rcu_preempt_stall_reset(void)
887{
888}
889
868#endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */ 890#endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
869 891
870/* 892/*
@@ -919,15 +941,6 @@ static void rcu_preempt_process_callbacks(void)
919} 941}
920 942
921/* 943/*
922 * In classic RCU, call_rcu() is just call_rcu_sched().
923 */
924void call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu))
925{
926 call_rcu_sched(head, func);
927}
928EXPORT_SYMBOL_GPL(call_rcu);
929
930/*
931 * Wait for an rcu-preempt grace period, but make it happen quickly. 944 * Wait for an rcu-preempt grace period, but make it happen quickly.
932 * But because preemptable RCU does not exist, map to rcu-sched. 945 * But because preemptable RCU does not exist, map to rcu-sched.
933 */ 946 */
diff --git a/kernel/rcutree_trace.c b/kernel/rcutree_trace.c
index 36c95b45738e..d15430b9d122 100644
--- a/kernel/rcutree_trace.c
+++ b/kernel/rcutree_trace.c
@@ -64,7 +64,9 @@ static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp)
64 rdp->dynticks_fqs); 64 rdp->dynticks_fqs);
65#endif /* #ifdef CONFIG_NO_HZ */ 65#endif /* #ifdef CONFIG_NO_HZ */
66 seq_printf(m, " of=%lu ri=%lu", rdp->offline_fqs, rdp->resched_ipi); 66 seq_printf(m, " of=%lu ri=%lu", rdp->offline_fqs, rdp->resched_ipi);
67 seq_printf(m, " ql=%ld b=%ld\n", rdp->qlen, rdp->blimit); 67 seq_printf(m, " ql=%ld b=%ld", rdp->qlen, rdp->blimit);
68 seq_printf(m, " ci=%lu co=%lu ca=%lu\n",
69 rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
68} 70}
69 71
70#define PRINT_RCU_DATA(name, func, m) \ 72#define PRINT_RCU_DATA(name, func, m) \
@@ -119,7 +121,9 @@ static void print_one_rcu_data_csv(struct seq_file *m, struct rcu_data *rdp)
119 rdp->dynticks_fqs); 121 rdp->dynticks_fqs);
120#endif /* #ifdef CONFIG_NO_HZ */ 122#endif /* #ifdef CONFIG_NO_HZ */
121 seq_printf(m, ",%lu,%lu", rdp->offline_fqs, rdp->resched_ipi); 123 seq_printf(m, ",%lu,%lu", rdp->offline_fqs, rdp->resched_ipi);
122 seq_printf(m, ",%ld,%ld\n", rdp->qlen, rdp->blimit); 124 seq_printf(m, ",%ld,%ld", rdp->qlen, rdp->blimit);
125 seq_printf(m, ",%lu,%lu,%lu\n",
126 rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
123} 127}
124 128
125static int show_rcudata_csv(struct seq_file *m, void *unused) 129static int show_rcudata_csv(struct seq_file *m, void *unused)
@@ -128,7 +132,7 @@ static int show_rcudata_csv(struct seq_file *m, void *unused)
128#ifdef CONFIG_NO_HZ 132#ifdef CONFIG_NO_HZ
129 seq_puts(m, "\"dt\",\"dt nesting\",\"dn\",\"df\","); 133 seq_puts(m, "\"dt\",\"dt nesting\",\"dn\",\"df\",");
130#endif /* #ifdef CONFIG_NO_HZ */ 134#endif /* #ifdef CONFIG_NO_HZ */
131 seq_puts(m, "\"of\",\"ri\",\"ql\",\"b\"\n"); 135 seq_puts(m, "\"of\",\"ri\",\"ql\",\"b\",\"ci\",\"co\",\"ca\"\n");
132#ifdef CONFIG_TREE_PREEMPT_RCU 136#ifdef CONFIG_TREE_PREEMPT_RCU
133 seq_puts(m, "\"rcu_preempt:\"\n"); 137 seq_puts(m, "\"rcu_preempt:\"\n");
134 PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data_csv, m); 138 PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data_csv, m);
@@ -262,7 +266,7 @@ static void print_rcu_pendings(struct seq_file *m, struct rcu_state *rsp)
262 struct rcu_data *rdp; 266 struct rcu_data *rdp;
263 267
264 for_each_possible_cpu(cpu) { 268 for_each_possible_cpu(cpu) {
265 rdp = rsp->rda[cpu]; 269 rdp = per_cpu_ptr(rsp->rda, cpu);
266 if (rdp->beenonline) 270 if (rdp->beenonline)
267 print_one_rcu_pending(m, rdp); 271 print_one_rcu_pending(m, rdp);
268 } 272 }
diff --git a/kernel/sched.c b/kernel/sched.c
index c0d2067f3e0d..d42992bccdfa 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -426,9 +426,7 @@ struct root_domain {
426 */ 426 */
427 cpumask_var_t rto_mask; 427 cpumask_var_t rto_mask;
428 atomic_t rto_count; 428 atomic_t rto_count;
429#ifdef CONFIG_SMP
430 struct cpupri cpupri; 429 struct cpupri cpupri;
431#endif
432}; 430};
433 431
434/* 432/*
@@ -437,7 +435,7 @@ struct root_domain {
437 */ 435 */
438static struct root_domain def_root_domain; 436static struct root_domain def_root_domain;
439 437
440#endif 438#endif /* CONFIG_SMP */
441 439
442/* 440/*
443 * This is the main, per-CPU runqueue data structure. 441 * This is the main, per-CPU runqueue data structure.
@@ -488,11 +486,12 @@ struct rq {
488 */ 486 */
489 unsigned long nr_uninterruptible; 487 unsigned long nr_uninterruptible;
490 488
491 struct task_struct *curr, *idle; 489 struct task_struct *curr, *idle, *stop;
492 unsigned long next_balance; 490 unsigned long next_balance;
493 struct mm_struct *prev_mm; 491 struct mm_struct *prev_mm;
494 492
495 u64 clock; 493 u64 clock;
494 u64 clock_task;
496 495
497 atomic_t nr_iowait; 496 atomic_t nr_iowait;
498 497
@@ -520,6 +519,10 @@ struct rq {
520 u64 avg_idle; 519 u64 avg_idle;
521#endif 520#endif
522 521
522#ifdef CONFIG_IRQ_TIME_ACCOUNTING
523 u64 prev_irq_time;
524#endif
525
523 /* calc_load related fields */ 526 /* calc_load related fields */
524 unsigned long calc_load_update; 527 unsigned long calc_load_update;
525 long calc_load_active; 528 long calc_load_active;
@@ -643,10 +646,22 @@ static inline struct task_group *task_group(struct task_struct *p)
643 646
644#endif /* CONFIG_CGROUP_SCHED */ 647#endif /* CONFIG_CGROUP_SCHED */
645 648
649static u64 irq_time_cpu(int cpu);
650static void sched_irq_time_avg_update(struct rq *rq, u64 irq_time);
651
646inline void update_rq_clock(struct rq *rq) 652inline void update_rq_clock(struct rq *rq)
647{ 653{
648 if (!rq->skip_clock_update) 654 if (!rq->skip_clock_update) {
649 rq->clock = sched_clock_cpu(cpu_of(rq)); 655 int cpu = cpu_of(rq);
656 u64 irq_time;
657
658 rq->clock = sched_clock_cpu(cpu);
659 irq_time = irq_time_cpu(cpu);
660 if (rq->clock - irq_time > rq->clock_task)
661 rq->clock_task = rq->clock - irq_time;
662
663 sched_irq_time_avg_update(rq, irq_time);
664 }
650} 665}
651 666
652/* 667/*
@@ -723,7 +738,7 @@ sched_feat_write(struct file *filp, const char __user *ubuf,
723 size_t cnt, loff_t *ppos) 738 size_t cnt, loff_t *ppos)
724{ 739{
725 char buf[64]; 740 char buf[64];
726 char *cmp = buf; 741 char *cmp;
727 int neg = 0; 742 int neg = 0;
728 int i; 743 int i;
729 744
@@ -734,6 +749,7 @@ sched_feat_write(struct file *filp, const char __user *ubuf,
734 return -EFAULT; 749 return -EFAULT;
735 750
736 buf[cnt] = 0; 751 buf[cnt] = 0;
752 cmp = strstrip(buf);
737 753
738 if (strncmp(buf, "NO_", 3) == 0) { 754 if (strncmp(buf, "NO_", 3) == 0) {
739 neg = 1; 755 neg = 1;
@@ -741,9 +757,7 @@ sched_feat_write(struct file *filp, const char __user *ubuf,
741 } 757 }
742 758
743 for (i = 0; sched_feat_names[i]; i++) { 759 for (i = 0; sched_feat_names[i]; i++) {
744 int len = strlen(sched_feat_names[i]); 760 if (strcmp(cmp, sched_feat_names[i]) == 0) {
745
746 if (strncmp(cmp, sched_feat_names[i], len) == 0) {
747 if (neg) 761 if (neg)
748 sysctl_sched_features &= ~(1UL << i); 762 sysctl_sched_features &= ~(1UL << i);
749 else 763 else
@@ -1840,7 +1854,7 @@ static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu)
1840 1854
1841static const struct sched_class rt_sched_class; 1855static const struct sched_class rt_sched_class;
1842 1856
1843#define sched_class_highest (&rt_sched_class) 1857#define sched_class_highest (&stop_sched_class)
1844#define for_each_class(class) \ 1858#define for_each_class(class) \
1845 for (class = sched_class_highest; class; class = class->next) 1859 for (class = sched_class_highest; class; class = class->next)
1846 1860
@@ -1858,12 +1872,6 @@ static void dec_nr_running(struct rq *rq)
1858 1872
1859static void set_load_weight(struct task_struct *p) 1873static void set_load_weight(struct task_struct *p)
1860{ 1874{
1861 if (task_has_rt_policy(p)) {
1862 p->se.load.weight = 0;
1863 p->se.load.inv_weight = WMULT_CONST;
1864 return;
1865 }
1866
1867 /* 1875 /*
1868 * SCHED_IDLE tasks get minimal weight: 1876 * SCHED_IDLE tasks get minimal weight:
1869 */ 1877 */
@@ -1917,13 +1925,132 @@ static void deactivate_task(struct rq *rq, struct task_struct *p, int flags)
1917 dec_nr_running(rq); 1925 dec_nr_running(rq);
1918} 1926}
1919 1927
1928#ifdef CONFIG_IRQ_TIME_ACCOUNTING
1929
1930/*
1931 * There are no locks covering percpu hardirq/softirq time.
1932 * They are only modified in account_system_vtime, on corresponding CPU
1933 * with interrupts disabled. So, writes are safe.
1934 * They are read and saved off onto struct rq in update_rq_clock().
1935 * This may result in other CPU reading this CPU's irq time and can
1936 * race with irq/account_system_vtime on this CPU. We would either get old
1937 * or new value (or semi updated value on 32 bit) with a side effect of
1938 * accounting a slice of irq time to wrong task when irq is in progress
1939 * while we read rq->clock. That is a worthy compromise in place of having
1940 * locks on each irq in account_system_time.
1941 */
1942static DEFINE_PER_CPU(u64, cpu_hardirq_time);
1943static DEFINE_PER_CPU(u64, cpu_softirq_time);
1944
1945static DEFINE_PER_CPU(u64, irq_start_time);
1946static int sched_clock_irqtime;
1947
1948void enable_sched_clock_irqtime(void)
1949{
1950 sched_clock_irqtime = 1;
1951}
1952
1953void disable_sched_clock_irqtime(void)
1954{
1955 sched_clock_irqtime = 0;
1956}
1957
1958static u64 irq_time_cpu(int cpu)
1959{
1960 if (!sched_clock_irqtime)
1961 return 0;
1962
1963 return per_cpu(cpu_softirq_time, cpu) + per_cpu(cpu_hardirq_time, cpu);
1964}
1965
1966void account_system_vtime(struct task_struct *curr)
1967{
1968 unsigned long flags;
1969 int cpu;
1970 u64 now, delta;
1971
1972 if (!sched_clock_irqtime)
1973 return;
1974
1975 local_irq_save(flags);
1976
1977 cpu = smp_processor_id();
1978 now = sched_clock_cpu(cpu);
1979 delta = now - per_cpu(irq_start_time, cpu);
1980 per_cpu(irq_start_time, cpu) = now;
1981 /*
1982 * We do not account for softirq time from ksoftirqd here.
1983 * We want to continue accounting softirq time to ksoftirqd thread
1984 * in that case, so as not to confuse scheduler with a special task
1985 * that do not consume any time, but still wants to run.
1986 */
1987 if (hardirq_count())
1988 per_cpu(cpu_hardirq_time, cpu) += delta;
1989 else if (in_serving_softirq() && !(curr->flags & PF_KSOFTIRQD))
1990 per_cpu(cpu_softirq_time, cpu) += delta;
1991
1992 local_irq_restore(flags);
1993}
1994EXPORT_SYMBOL_GPL(account_system_vtime);
1995
1996static void sched_irq_time_avg_update(struct rq *rq, u64 curr_irq_time)
1997{
1998 if (sched_clock_irqtime && sched_feat(NONIRQ_POWER)) {
1999 u64 delta_irq = curr_irq_time - rq->prev_irq_time;
2000 rq->prev_irq_time = curr_irq_time;
2001 sched_rt_avg_update(rq, delta_irq);
2002 }
2003}
2004
2005#else
2006
2007static u64 irq_time_cpu(int cpu)
2008{
2009 return 0;
2010}
2011
2012static void sched_irq_time_avg_update(struct rq *rq, u64 curr_irq_time) { }
2013
2014#endif
2015
1920#include "sched_idletask.c" 2016#include "sched_idletask.c"
1921#include "sched_fair.c" 2017#include "sched_fair.c"
1922#include "sched_rt.c" 2018#include "sched_rt.c"
2019#include "sched_stoptask.c"
1923#ifdef CONFIG_SCHED_DEBUG 2020#ifdef CONFIG_SCHED_DEBUG
1924# include "sched_debug.c" 2021# include "sched_debug.c"
1925#endif 2022#endif
1926 2023
2024void sched_set_stop_task(int cpu, struct task_struct *stop)
2025{
2026 struct sched_param param = { .sched_priority = MAX_RT_PRIO - 1 };
2027 struct task_struct *old_stop = cpu_rq(cpu)->stop;
2028
2029 if (stop) {
2030 /*
2031 * Make it appear like a SCHED_FIFO task, its something
2032 * userspace knows about and won't get confused about.
2033 *
2034 * Also, it will make PI more or less work without too
2035 * much confusion -- but then, stop work should not
2036 * rely on PI working anyway.
2037 */
2038 sched_setscheduler_nocheck(stop, SCHED_FIFO, &param);
2039
2040 stop->sched_class = &stop_sched_class;
2041 }
2042
2043 cpu_rq(cpu)->stop = stop;
2044
2045 if (old_stop) {
2046 /*
2047 * Reset it back to a normal scheduling class so that
2048 * it can die in pieces.
2049 */
2050 old_stop->sched_class = &rt_sched_class;
2051 }
2052}
2053
1927/* 2054/*
1928 * __normal_prio - return the priority that is based on the static prio 2055 * __normal_prio - return the priority that is based on the static prio
1929 */ 2056 */
@@ -2003,6 +2130,9 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
2003 if (p->sched_class != &fair_sched_class) 2130 if (p->sched_class != &fair_sched_class)
2004 return 0; 2131 return 0;
2005 2132
2133 if (unlikely(p->policy == SCHED_IDLE))
2134 return 0;
2135
2006 /* 2136 /*
2007 * Buddy candidates are cache hot: 2137 * Buddy candidates are cache hot:
2008 */ 2138 */
@@ -2852,14 +2982,14 @@ context_switch(struct rq *rq, struct task_struct *prev,
2852 */ 2982 */
2853 arch_start_context_switch(prev); 2983 arch_start_context_switch(prev);
2854 2984
2855 if (likely(!mm)) { 2985 if (!mm) {
2856 next->active_mm = oldmm; 2986 next->active_mm = oldmm;
2857 atomic_inc(&oldmm->mm_count); 2987 atomic_inc(&oldmm->mm_count);
2858 enter_lazy_tlb(oldmm, next); 2988 enter_lazy_tlb(oldmm, next);
2859 } else 2989 } else
2860 switch_mm(oldmm, mm, next); 2990 switch_mm(oldmm, mm, next);
2861 2991
2862 if (likely(!prev->mm)) { 2992 if (!prev->mm) {
2863 prev->active_mm = NULL; 2993 prev->active_mm = NULL;
2864 rq->prev_mm = oldmm; 2994 rq->prev_mm = oldmm;
2865 } 2995 }
@@ -3248,7 +3378,7 @@ static u64 do_task_delta_exec(struct task_struct *p, struct rq *rq)
3248 3378
3249 if (task_current(rq, p)) { 3379 if (task_current(rq, p)) {
3250 update_rq_clock(rq); 3380 update_rq_clock(rq);
3251 ns = rq->clock - p->se.exec_start; 3381 ns = rq->clock_task - p->se.exec_start;
3252 if ((s64)ns < 0) 3382 if ((s64)ns < 0)
3253 ns = 0; 3383 ns = 0;
3254 } 3384 }
@@ -3397,7 +3527,7 @@ void account_system_time(struct task_struct *p, int hardirq_offset,
3397 tmp = cputime_to_cputime64(cputime); 3527 tmp = cputime_to_cputime64(cputime);
3398 if (hardirq_count() - hardirq_offset) 3528 if (hardirq_count() - hardirq_offset)
3399 cpustat->irq = cputime64_add(cpustat->irq, tmp); 3529 cpustat->irq = cputime64_add(cpustat->irq, tmp);
3400 else if (softirq_count()) 3530 else if (in_serving_softirq())
3401 cpustat->softirq = cputime64_add(cpustat->softirq, tmp); 3531 cpustat->softirq = cputime64_add(cpustat->softirq, tmp);
3402 else 3532 else
3403 cpustat->system = cputime64_add(cpustat->system, tmp); 3533 cpustat->system = cputime64_add(cpustat->system, tmp);
@@ -3723,17 +3853,13 @@ pick_next_task(struct rq *rq)
3723 return p; 3853 return p;
3724 } 3854 }
3725 3855
3726 class = sched_class_highest; 3856 for_each_class(class) {
3727 for ( ; ; ) {
3728 p = class->pick_next_task(rq); 3857 p = class->pick_next_task(rq);
3729 if (p) 3858 if (p)
3730 return p; 3859 return p;
3731 /*
3732 * Will never be NULL as the idle class always
3733 * returns a non-NULL p:
3734 */
3735 class = class->next;
3736 } 3860 }
3861
3862 BUG(); /* the idle class will always have a runnable task */
3737} 3863}
3738 3864
3739/* 3865/*
@@ -4358,6 +4484,7 @@ void rt_mutex_setprio(struct task_struct *p, int prio)
4358 4484
4359 rq = task_rq_lock(p, &flags); 4485 rq = task_rq_lock(p, &flags);
4360 4486
4487 trace_sched_pi_setprio(p, prio);
4361 oldprio = p->prio; 4488 oldprio = p->prio;
4362 prev_class = p->sched_class; 4489 prev_class = p->sched_class;
4363 on_rq = p->se.on_rq; 4490 on_rq = p->se.on_rq;
@@ -4645,7 +4772,7 @@ recheck:
4645 } 4772 }
4646 4773
4647 if (user) { 4774 if (user) {
4648 retval = security_task_setscheduler(p, policy, param); 4775 retval = security_task_setscheduler(p);
4649 if (retval) 4776 if (retval)
4650 return retval; 4777 return retval;
4651 } 4778 }
@@ -4661,6 +4788,15 @@ recheck:
4661 */ 4788 */
4662 rq = __task_rq_lock(p); 4789 rq = __task_rq_lock(p);
4663 4790
4791 /*
4792 * Changing the policy of the stop threads its a very bad idea
4793 */
4794 if (p == rq->stop) {
4795 __task_rq_unlock(rq);
4796 raw_spin_unlock_irqrestore(&p->pi_lock, flags);
4797 return -EINVAL;
4798 }
4799
4664#ifdef CONFIG_RT_GROUP_SCHED 4800#ifdef CONFIG_RT_GROUP_SCHED
4665 if (user) { 4801 if (user) {
4666 /* 4802 /*
@@ -4887,13 +5023,13 @@ long sched_setaffinity(pid_t pid, const struct cpumask *in_mask)
4887 if (!check_same_owner(p) && !capable(CAP_SYS_NICE)) 5023 if (!check_same_owner(p) && !capable(CAP_SYS_NICE))
4888 goto out_unlock; 5024 goto out_unlock;
4889 5025
4890 retval = security_task_setscheduler(p, 0, NULL); 5026 retval = security_task_setscheduler(p);
4891 if (retval) 5027 if (retval)
4892 goto out_unlock; 5028 goto out_unlock;
4893 5029
4894 cpuset_cpus_allowed(p, cpus_allowed); 5030 cpuset_cpus_allowed(p, cpus_allowed);
4895 cpumask_and(new_mask, in_mask, cpus_allowed); 5031 cpumask_and(new_mask, in_mask, cpus_allowed);
4896 again: 5032again:
4897 retval = set_cpus_allowed_ptr(p, new_mask); 5033 retval = set_cpus_allowed_ptr(p, new_mask);
4898 5034
4899 if (!retval) { 5035 if (!retval) {
@@ -5337,7 +5473,19 @@ void __cpuinit init_idle(struct task_struct *idle, int cpu)
5337 idle->se.exec_start = sched_clock(); 5473 idle->se.exec_start = sched_clock();
5338 5474
5339 cpumask_copy(&idle->cpus_allowed, cpumask_of(cpu)); 5475 cpumask_copy(&idle->cpus_allowed, cpumask_of(cpu));
5476 /*
5477 * We're having a chicken and egg problem, even though we are
5478 * holding rq->lock, the cpu isn't yet set to this cpu so the
5479 * lockdep check in task_group() will fail.
5480 *
5481 * Similar case to sched_fork(). / Alternatively we could
5482 * use task_rq_lock() here and obtain the other rq->lock.
5483 *
5484 * Silence PROVE_RCU
5485 */
5486 rcu_read_lock();
5340 __set_task_cpu(idle, cpu); 5487 __set_task_cpu(idle, cpu);
5488 rcu_read_unlock();
5341 5489
5342 rq->curr = rq->idle = idle; 5490 rq->curr = rq->idle = idle;
5343#if defined(CONFIG_SMP) && defined(__ARCH_WANT_UNLOCKED_CTXSW) 5491#if defined(CONFIG_SMP) && defined(__ARCH_WANT_UNLOCKED_CTXSW)
@@ -6514,6 +6662,7 @@ struct s_data {
6514 cpumask_var_t nodemask; 6662 cpumask_var_t nodemask;
6515 cpumask_var_t this_sibling_map; 6663 cpumask_var_t this_sibling_map;
6516 cpumask_var_t this_core_map; 6664 cpumask_var_t this_core_map;
6665 cpumask_var_t this_book_map;
6517 cpumask_var_t send_covered; 6666 cpumask_var_t send_covered;
6518 cpumask_var_t tmpmask; 6667 cpumask_var_t tmpmask;
6519 struct sched_group **sched_group_nodes; 6668 struct sched_group **sched_group_nodes;
@@ -6525,6 +6674,7 @@ enum s_alloc {
6525 sa_rootdomain, 6674 sa_rootdomain,
6526 sa_tmpmask, 6675 sa_tmpmask,
6527 sa_send_covered, 6676 sa_send_covered,
6677 sa_this_book_map,
6528 sa_this_core_map, 6678 sa_this_core_map,
6529 sa_this_sibling_map, 6679 sa_this_sibling_map,
6530 sa_nodemask, 6680 sa_nodemask,
@@ -6560,31 +6710,48 @@ cpu_to_cpu_group(int cpu, const struct cpumask *cpu_map,
6560#ifdef CONFIG_SCHED_MC 6710#ifdef CONFIG_SCHED_MC
6561static DEFINE_PER_CPU(struct static_sched_domain, core_domains); 6711static DEFINE_PER_CPU(struct static_sched_domain, core_domains);
6562static DEFINE_PER_CPU(struct static_sched_group, sched_group_core); 6712static DEFINE_PER_CPU(struct static_sched_group, sched_group_core);
6563#endif /* CONFIG_SCHED_MC */
6564 6713
6565#if defined(CONFIG_SCHED_MC) && defined(CONFIG_SCHED_SMT)
6566static int 6714static int
6567cpu_to_core_group(int cpu, const struct cpumask *cpu_map, 6715cpu_to_core_group(int cpu, const struct cpumask *cpu_map,
6568 struct sched_group **sg, struct cpumask *mask) 6716 struct sched_group **sg, struct cpumask *mask)
6569{ 6717{
6570 int group; 6718 int group;
6571 6719#ifdef CONFIG_SCHED_SMT
6572 cpumask_and(mask, topology_thread_cpumask(cpu), cpu_map); 6720 cpumask_and(mask, topology_thread_cpumask(cpu), cpu_map);
6573 group = cpumask_first(mask); 6721 group = cpumask_first(mask);
6722#else
6723 group = cpu;
6724#endif
6574 if (sg) 6725 if (sg)
6575 *sg = &per_cpu(sched_group_core, group).sg; 6726 *sg = &per_cpu(sched_group_core, group).sg;
6576 return group; 6727 return group;
6577} 6728}
6578#elif defined(CONFIG_SCHED_MC) 6729#endif /* CONFIG_SCHED_MC */
6730
6731/*
6732 * book sched-domains:
6733 */
6734#ifdef CONFIG_SCHED_BOOK
6735static DEFINE_PER_CPU(struct static_sched_domain, book_domains);
6736static DEFINE_PER_CPU(struct static_sched_group, sched_group_book);
6737
6579static int 6738static int
6580cpu_to_core_group(int cpu, const struct cpumask *cpu_map, 6739cpu_to_book_group(int cpu, const struct cpumask *cpu_map,
6581 struct sched_group **sg, struct cpumask *unused) 6740 struct sched_group **sg, struct cpumask *mask)
6582{ 6741{
6742 int group = cpu;
6743#ifdef CONFIG_SCHED_MC
6744 cpumask_and(mask, cpu_coregroup_mask(cpu), cpu_map);
6745 group = cpumask_first(mask);
6746#elif defined(CONFIG_SCHED_SMT)
6747 cpumask_and(mask, topology_thread_cpumask(cpu), cpu_map);
6748 group = cpumask_first(mask);
6749#endif
6583 if (sg) 6750 if (sg)
6584 *sg = &per_cpu(sched_group_core, cpu).sg; 6751 *sg = &per_cpu(sched_group_book, group).sg;
6585 return cpu; 6752 return group;
6586} 6753}
6587#endif 6754#endif /* CONFIG_SCHED_BOOK */
6588 6755
6589static DEFINE_PER_CPU(struct static_sched_domain, phys_domains); 6756static DEFINE_PER_CPU(struct static_sched_domain, phys_domains);
6590static DEFINE_PER_CPU(struct static_sched_group, sched_group_phys); 6757static DEFINE_PER_CPU(struct static_sched_group, sched_group_phys);
@@ -6594,7 +6761,10 @@ cpu_to_phys_group(int cpu, const struct cpumask *cpu_map,
6594 struct sched_group **sg, struct cpumask *mask) 6761 struct sched_group **sg, struct cpumask *mask)
6595{ 6762{
6596 int group; 6763 int group;
6597#ifdef CONFIG_SCHED_MC 6764#ifdef CONFIG_SCHED_BOOK
6765 cpumask_and(mask, cpu_book_mask(cpu), cpu_map);
6766 group = cpumask_first(mask);
6767#elif defined(CONFIG_SCHED_MC)
6598 cpumask_and(mask, cpu_coregroup_mask(cpu), cpu_map); 6768 cpumask_and(mask, cpu_coregroup_mask(cpu), cpu_map);
6599 group = cpumask_first(mask); 6769 group = cpumask_first(mask);
6600#elif defined(CONFIG_SCHED_SMT) 6770#elif defined(CONFIG_SCHED_SMT)
@@ -6855,6 +7025,9 @@ SD_INIT_FUNC(CPU)
6855#ifdef CONFIG_SCHED_MC 7025#ifdef CONFIG_SCHED_MC
6856 SD_INIT_FUNC(MC) 7026 SD_INIT_FUNC(MC)
6857#endif 7027#endif
7028#ifdef CONFIG_SCHED_BOOK
7029 SD_INIT_FUNC(BOOK)
7030#endif
6858 7031
6859static int default_relax_domain_level = -1; 7032static int default_relax_domain_level = -1;
6860 7033
@@ -6904,6 +7077,8 @@ static void __free_domain_allocs(struct s_data *d, enum s_alloc what,
6904 free_cpumask_var(d->tmpmask); /* fall through */ 7077 free_cpumask_var(d->tmpmask); /* fall through */
6905 case sa_send_covered: 7078 case sa_send_covered:
6906 free_cpumask_var(d->send_covered); /* fall through */ 7079 free_cpumask_var(d->send_covered); /* fall through */
7080 case sa_this_book_map:
7081 free_cpumask_var(d->this_book_map); /* fall through */
6907 case sa_this_core_map: 7082 case sa_this_core_map:
6908 free_cpumask_var(d->this_core_map); /* fall through */ 7083 free_cpumask_var(d->this_core_map); /* fall through */
6909 case sa_this_sibling_map: 7084 case sa_this_sibling_map:
@@ -6950,8 +7125,10 @@ static enum s_alloc __visit_domain_allocation_hell(struct s_data *d,
6950 return sa_nodemask; 7125 return sa_nodemask;
6951 if (!alloc_cpumask_var(&d->this_core_map, GFP_KERNEL)) 7126 if (!alloc_cpumask_var(&d->this_core_map, GFP_KERNEL))
6952 return sa_this_sibling_map; 7127 return sa_this_sibling_map;
6953 if (!alloc_cpumask_var(&d->send_covered, GFP_KERNEL)) 7128 if (!alloc_cpumask_var(&d->this_book_map, GFP_KERNEL))
6954 return sa_this_core_map; 7129 return sa_this_core_map;
7130 if (!alloc_cpumask_var(&d->send_covered, GFP_KERNEL))
7131 return sa_this_book_map;
6955 if (!alloc_cpumask_var(&d->tmpmask, GFP_KERNEL)) 7132 if (!alloc_cpumask_var(&d->tmpmask, GFP_KERNEL))
6956 return sa_send_covered; 7133 return sa_send_covered;
6957 d->rd = alloc_rootdomain(); 7134 d->rd = alloc_rootdomain();
@@ -7009,6 +7186,23 @@ static struct sched_domain *__build_cpu_sched_domain(struct s_data *d,
7009 return sd; 7186 return sd;
7010} 7187}
7011 7188
7189static struct sched_domain *__build_book_sched_domain(struct s_data *d,
7190 const struct cpumask *cpu_map, struct sched_domain_attr *attr,
7191 struct sched_domain *parent, int i)
7192{
7193 struct sched_domain *sd = parent;
7194#ifdef CONFIG_SCHED_BOOK
7195 sd = &per_cpu(book_domains, i).sd;
7196 SD_INIT(sd, BOOK);
7197 set_domain_attribute(sd, attr);
7198 cpumask_and(sched_domain_span(sd), cpu_map, cpu_book_mask(i));
7199 sd->parent = parent;
7200 parent->child = sd;
7201 cpu_to_book_group(i, cpu_map, &sd->groups, d->tmpmask);
7202#endif
7203 return sd;
7204}
7205
7012static struct sched_domain *__build_mc_sched_domain(struct s_data *d, 7206static struct sched_domain *__build_mc_sched_domain(struct s_data *d,
7013 const struct cpumask *cpu_map, struct sched_domain_attr *attr, 7207 const struct cpumask *cpu_map, struct sched_domain_attr *attr,
7014 struct sched_domain *parent, int i) 7208 struct sched_domain *parent, int i)
@@ -7066,6 +7260,15 @@ static void build_sched_groups(struct s_data *d, enum sched_domain_level l,
7066 d->send_covered, d->tmpmask); 7260 d->send_covered, d->tmpmask);
7067 break; 7261 break;
7068#endif 7262#endif
7263#ifdef CONFIG_SCHED_BOOK
7264 case SD_LV_BOOK: /* set up book groups */
7265 cpumask_and(d->this_book_map, cpu_map, cpu_book_mask(cpu));
7266 if (cpu == cpumask_first(d->this_book_map))
7267 init_sched_build_groups(d->this_book_map, cpu_map,
7268 &cpu_to_book_group,
7269 d->send_covered, d->tmpmask);
7270 break;
7271#endif
7069 case SD_LV_CPU: /* set up physical groups */ 7272 case SD_LV_CPU: /* set up physical groups */
7070 cpumask_and(d->nodemask, cpumask_of_node(cpu), cpu_map); 7273 cpumask_and(d->nodemask, cpumask_of_node(cpu), cpu_map);
7071 if (!cpumask_empty(d->nodemask)) 7274 if (!cpumask_empty(d->nodemask))
@@ -7113,12 +7316,14 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
7113 7316
7114 sd = __build_numa_sched_domains(&d, cpu_map, attr, i); 7317 sd = __build_numa_sched_domains(&d, cpu_map, attr, i);
7115 sd = __build_cpu_sched_domain(&d, cpu_map, attr, sd, i); 7318 sd = __build_cpu_sched_domain(&d, cpu_map, attr, sd, i);
7319 sd = __build_book_sched_domain(&d, cpu_map, attr, sd, i);
7116 sd = __build_mc_sched_domain(&d, cpu_map, attr, sd, i); 7320 sd = __build_mc_sched_domain(&d, cpu_map, attr, sd, i);
7117 sd = __build_smt_sched_domain(&d, cpu_map, attr, sd, i); 7321 sd = __build_smt_sched_domain(&d, cpu_map, attr, sd, i);
7118 } 7322 }
7119 7323
7120 for_each_cpu(i, cpu_map) { 7324 for_each_cpu(i, cpu_map) {
7121 build_sched_groups(&d, SD_LV_SIBLING, cpu_map, i); 7325 build_sched_groups(&d, SD_LV_SIBLING, cpu_map, i);
7326 build_sched_groups(&d, SD_LV_BOOK, cpu_map, i);
7122 build_sched_groups(&d, SD_LV_MC, cpu_map, i); 7327 build_sched_groups(&d, SD_LV_MC, cpu_map, i);
7123 } 7328 }
7124 7329
@@ -7149,6 +7354,12 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
7149 init_sched_groups_power(i, sd); 7354 init_sched_groups_power(i, sd);
7150 } 7355 }
7151#endif 7356#endif
7357#ifdef CONFIG_SCHED_BOOK
7358 for_each_cpu(i, cpu_map) {
7359 sd = &per_cpu(book_domains, i).sd;
7360 init_sched_groups_power(i, sd);
7361 }
7362#endif
7152 7363
7153 for_each_cpu(i, cpu_map) { 7364 for_each_cpu(i, cpu_map) {
7154 sd = &per_cpu(phys_domains, i).sd; 7365 sd = &per_cpu(phys_domains, i).sd;
@@ -7174,6 +7385,8 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
7174 sd = &per_cpu(cpu_domains, i).sd; 7385 sd = &per_cpu(cpu_domains, i).sd;
7175#elif defined(CONFIG_SCHED_MC) 7386#elif defined(CONFIG_SCHED_MC)
7176 sd = &per_cpu(core_domains, i).sd; 7387 sd = &per_cpu(core_domains, i).sd;
7388#elif defined(CONFIG_SCHED_BOOK)
7389 sd = &per_cpu(book_domains, i).sd;
7177#else 7390#else
7178 sd = &per_cpu(phys_domains, i).sd; 7391 sd = &per_cpu(phys_domains, i).sd;
7179#endif 7392#endif
@@ -8078,9 +8291,9 @@ int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
8078 8291
8079 return 1; 8292 return 1;
8080 8293
8081 err_free_rq: 8294err_free_rq:
8082 kfree(cfs_rq); 8295 kfree(cfs_rq);
8083 err: 8296err:
8084 return 0; 8297 return 0;
8085} 8298}
8086 8299
@@ -8168,9 +8381,9 @@ int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
8168 8381
8169 return 1; 8382 return 1;
8170 8383
8171 err_free_rq: 8384err_free_rq:
8172 kfree(rt_rq); 8385 kfree(rt_rq);
8173 err: 8386err:
8174 return 0; 8387 return 0;
8175} 8388}
8176 8389
@@ -8528,7 +8741,7 @@ static int tg_set_bandwidth(struct task_group *tg,
8528 raw_spin_unlock(&rt_rq->rt_runtime_lock); 8741 raw_spin_unlock(&rt_rq->rt_runtime_lock);
8529 } 8742 }
8530 raw_spin_unlock_irq(&tg->rt_bandwidth.rt_runtime_lock); 8743 raw_spin_unlock_irq(&tg->rt_bandwidth.rt_runtime_lock);
8531 unlock: 8744unlock:
8532 read_unlock(&tasklist_lock); 8745 read_unlock(&tasklist_lock);
8533 mutex_unlock(&rt_constraints_mutex); 8746 mutex_unlock(&rt_constraints_mutex);
8534 8747
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index db3f674ca49d..933f3d1b62ea 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -25,7 +25,7 @@
25 25
26/* 26/*
27 * Targeted preemption latency for CPU-bound tasks: 27 * Targeted preemption latency for CPU-bound tasks:
28 * (default: 5ms * (1 + ilog(ncpus)), units: nanoseconds) 28 * (default: 6ms * (1 + ilog(ncpus)), units: nanoseconds)
29 * 29 *
30 * NOTE: this latency value is not the same as the concept of 30 * NOTE: this latency value is not the same as the concept of
31 * 'timeslice length' - timeslices in CFS are of variable length 31 * 'timeslice length' - timeslices in CFS are of variable length
@@ -52,7 +52,7 @@ enum sched_tunable_scaling sysctl_sched_tunable_scaling
52 52
53/* 53/*
54 * Minimal preemption granularity for CPU-bound tasks: 54 * Minimal preemption granularity for CPU-bound tasks:
55 * (default: 2 msec * (1 + ilog(ncpus)), units: nanoseconds) 55 * (default: 0.75 msec * (1 + ilog(ncpus)), units: nanoseconds)
56 */ 56 */
57unsigned int sysctl_sched_min_granularity = 750000ULL; 57unsigned int sysctl_sched_min_granularity = 750000ULL;
58unsigned int normalized_sysctl_sched_min_granularity = 750000ULL; 58unsigned int normalized_sysctl_sched_min_granularity = 750000ULL;
@@ -519,7 +519,7 @@ __update_curr(struct cfs_rq *cfs_rq, struct sched_entity *curr,
519static void update_curr(struct cfs_rq *cfs_rq) 519static void update_curr(struct cfs_rq *cfs_rq)
520{ 520{
521 struct sched_entity *curr = cfs_rq->curr; 521 struct sched_entity *curr = cfs_rq->curr;
522 u64 now = rq_of(cfs_rq)->clock; 522 u64 now = rq_of(cfs_rq)->clock_task;
523 unsigned long delta_exec; 523 unsigned long delta_exec;
524 524
525 if (unlikely(!curr)) 525 if (unlikely(!curr))
@@ -602,7 +602,7 @@ update_stats_curr_start(struct cfs_rq *cfs_rq, struct sched_entity *se)
602 /* 602 /*
603 * We are starting a new run period: 603 * We are starting a new run period:
604 */ 604 */
605 se->exec_start = rq_of(cfs_rq)->clock; 605 se->exec_start = rq_of(cfs_rq)->clock_task;
606} 606}
607 607
608/************************************************** 608/**************************************************
@@ -1764,6 +1764,10 @@ static void pull_task(struct rq *src_rq, struct task_struct *p,
1764 set_task_cpu(p, this_cpu); 1764 set_task_cpu(p, this_cpu);
1765 activate_task(this_rq, p, 0); 1765 activate_task(this_rq, p, 0);
1766 check_preempt_curr(this_rq, p, 0); 1766 check_preempt_curr(this_rq, p, 0);
1767
1768 /* re-arm NEWIDLE balancing when moving tasks */
1769 src_rq->avg_idle = this_rq->avg_idle = 2*sysctl_sched_migration_cost;
1770 this_rq->idle_stamp = 0;
1767} 1771}
1768 1772
1769/* 1773/*
@@ -1798,7 +1802,7 @@ int can_migrate_task(struct task_struct *p, struct rq *rq, int this_cpu,
1798 * 2) too many balance attempts have failed. 1802 * 2) too many balance attempts have failed.
1799 */ 1803 */
1800 1804
1801 tsk_cache_hot = task_hot(p, rq->clock, sd); 1805 tsk_cache_hot = task_hot(p, rq->clock_task, sd);
1802 if (!tsk_cache_hot || 1806 if (!tsk_cache_hot ||
1803 sd->nr_balance_failed > sd->cache_nice_tries) { 1807 sd->nr_balance_failed > sd->cache_nice_tries) {
1804#ifdef CONFIG_SCHEDSTATS 1808#ifdef CONFIG_SCHEDSTATS
@@ -2030,12 +2034,14 @@ struct sd_lb_stats {
2030 unsigned long this_load; 2034 unsigned long this_load;
2031 unsigned long this_load_per_task; 2035 unsigned long this_load_per_task;
2032 unsigned long this_nr_running; 2036 unsigned long this_nr_running;
2037 unsigned long this_has_capacity;
2033 2038
2034 /* Statistics of the busiest group */ 2039 /* Statistics of the busiest group */
2035 unsigned long max_load; 2040 unsigned long max_load;
2036 unsigned long busiest_load_per_task; 2041 unsigned long busiest_load_per_task;
2037 unsigned long busiest_nr_running; 2042 unsigned long busiest_nr_running;
2038 unsigned long busiest_group_capacity; 2043 unsigned long busiest_group_capacity;
2044 unsigned long busiest_has_capacity;
2039 2045
2040 int group_imb; /* Is there imbalance in this sd */ 2046 int group_imb; /* Is there imbalance in this sd */
2041#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT) 2047#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
@@ -2058,6 +2064,7 @@ struct sg_lb_stats {
2058 unsigned long sum_weighted_load; /* Weighted load of group's tasks */ 2064 unsigned long sum_weighted_load; /* Weighted load of group's tasks */
2059 unsigned long group_capacity; 2065 unsigned long group_capacity;
2060 int group_imb; /* Is there an imbalance in the group ? */ 2066 int group_imb; /* Is there an imbalance in the group ? */
2067 int group_has_capacity; /* Is there extra capacity in the group? */
2061}; 2068};
2062 2069
2063/** 2070/**
@@ -2268,7 +2275,13 @@ unsigned long scale_rt_power(int cpu)
2268 u64 total, available; 2275 u64 total, available;
2269 2276
2270 total = sched_avg_period() + (rq->clock - rq->age_stamp); 2277 total = sched_avg_period() + (rq->clock - rq->age_stamp);
2271 available = total - rq->rt_avg; 2278
2279 if (unlikely(total < rq->rt_avg)) {
2280 /* Ensures that power won't end up being negative */
2281 available = 0;
2282 } else {
2283 available = total - rq->rt_avg;
2284 }
2272 2285
2273 if (unlikely((s64)total < SCHED_LOAD_SCALE)) 2286 if (unlikely((s64)total < SCHED_LOAD_SCALE))
2274 total = SCHED_LOAD_SCALE; 2287 total = SCHED_LOAD_SCALE;
@@ -2378,7 +2391,7 @@ static inline void update_sg_lb_stats(struct sched_domain *sd,
2378 int local_group, const struct cpumask *cpus, 2391 int local_group, const struct cpumask *cpus,
2379 int *balance, struct sg_lb_stats *sgs) 2392 int *balance, struct sg_lb_stats *sgs)
2380{ 2393{
2381 unsigned long load, max_cpu_load, min_cpu_load; 2394 unsigned long load, max_cpu_load, min_cpu_load, max_nr_running;
2382 int i; 2395 int i;
2383 unsigned int balance_cpu = -1, first_idle_cpu = 0; 2396 unsigned int balance_cpu = -1, first_idle_cpu = 0;
2384 unsigned long avg_load_per_task = 0; 2397 unsigned long avg_load_per_task = 0;
@@ -2389,6 +2402,7 @@ static inline void update_sg_lb_stats(struct sched_domain *sd,
2389 /* Tally up the load of all CPUs in the group */ 2402 /* Tally up the load of all CPUs in the group */
2390 max_cpu_load = 0; 2403 max_cpu_load = 0;
2391 min_cpu_load = ~0UL; 2404 min_cpu_load = ~0UL;
2405 max_nr_running = 0;
2392 2406
2393 for_each_cpu_and(i, sched_group_cpus(group), cpus) { 2407 for_each_cpu_and(i, sched_group_cpus(group), cpus) {
2394 struct rq *rq = cpu_rq(i); 2408 struct rq *rq = cpu_rq(i);
@@ -2406,8 +2420,10 @@ static inline void update_sg_lb_stats(struct sched_domain *sd,
2406 load = target_load(i, load_idx); 2420 load = target_load(i, load_idx);
2407 } else { 2421 } else {
2408 load = source_load(i, load_idx); 2422 load = source_load(i, load_idx);
2409 if (load > max_cpu_load) 2423 if (load > max_cpu_load) {
2410 max_cpu_load = load; 2424 max_cpu_load = load;
2425 max_nr_running = rq->nr_running;
2426 }
2411 if (min_cpu_load > load) 2427 if (min_cpu_load > load)
2412 min_cpu_load = load; 2428 min_cpu_load = load;
2413 } 2429 }
@@ -2447,13 +2463,15 @@ static inline void update_sg_lb_stats(struct sched_domain *sd,
2447 if (sgs->sum_nr_running) 2463 if (sgs->sum_nr_running)
2448 avg_load_per_task = sgs->sum_weighted_load / sgs->sum_nr_running; 2464 avg_load_per_task = sgs->sum_weighted_load / sgs->sum_nr_running;
2449 2465
2450 if ((max_cpu_load - min_cpu_load) > 2*avg_load_per_task) 2466 if ((max_cpu_load - min_cpu_load) > 2*avg_load_per_task && max_nr_running > 1)
2451 sgs->group_imb = 1; 2467 sgs->group_imb = 1;
2452 2468
2453 sgs->group_capacity = 2469 sgs->group_capacity = DIV_ROUND_CLOSEST(group->cpu_power, SCHED_LOAD_SCALE);
2454 DIV_ROUND_CLOSEST(group->cpu_power, SCHED_LOAD_SCALE);
2455 if (!sgs->group_capacity) 2470 if (!sgs->group_capacity)
2456 sgs->group_capacity = fix_small_capacity(sd, group); 2471 sgs->group_capacity = fix_small_capacity(sd, group);
2472
2473 if (sgs->group_capacity > sgs->sum_nr_running)
2474 sgs->group_has_capacity = 1;
2457} 2475}
2458 2476
2459/** 2477/**
@@ -2542,9 +2560,14 @@ static inline void update_sd_lb_stats(struct sched_domain *sd, int this_cpu,
2542 /* 2560 /*
2543 * In case the child domain prefers tasks go to siblings 2561 * In case the child domain prefers tasks go to siblings
2544 * first, lower the sg capacity to one so that we'll try 2562 * first, lower the sg capacity to one so that we'll try
2545 * and move all the excess tasks away. 2563 * and move all the excess tasks away. We lower the capacity
2564 * of a group only if the local group has the capacity to fit
2565 * these excess tasks, i.e. nr_running < group_capacity. The
2566 * extra check prevents the case where you always pull from the
2567 * heaviest group when it is already under-utilized (possible
2568 * with a large weight task outweighs the tasks on the system).
2546 */ 2569 */
2547 if (prefer_sibling) 2570 if (prefer_sibling && !local_group && sds->this_has_capacity)
2548 sgs.group_capacity = min(sgs.group_capacity, 1UL); 2571 sgs.group_capacity = min(sgs.group_capacity, 1UL);
2549 2572
2550 if (local_group) { 2573 if (local_group) {
@@ -2552,12 +2575,14 @@ static inline void update_sd_lb_stats(struct sched_domain *sd, int this_cpu,
2552 sds->this = sg; 2575 sds->this = sg;
2553 sds->this_nr_running = sgs.sum_nr_running; 2576 sds->this_nr_running = sgs.sum_nr_running;
2554 sds->this_load_per_task = sgs.sum_weighted_load; 2577 sds->this_load_per_task = sgs.sum_weighted_load;
2578 sds->this_has_capacity = sgs.group_has_capacity;
2555 } else if (update_sd_pick_busiest(sd, sds, sg, &sgs, this_cpu)) { 2579 } else if (update_sd_pick_busiest(sd, sds, sg, &sgs, this_cpu)) {
2556 sds->max_load = sgs.avg_load; 2580 sds->max_load = sgs.avg_load;
2557 sds->busiest = sg; 2581 sds->busiest = sg;
2558 sds->busiest_nr_running = sgs.sum_nr_running; 2582 sds->busiest_nr_running = sgs.sum_nr_running;
2559 sds->busiest_group_capacity = sgs.group_capacity; 2583 sds->busiest_group_capacity = sgs.group_capacity;
2560 sds->busiest_load_per_task = sgs.sum_weighted_load; 2584 sds->busiest_load_per_task = sgs.sum_weighted_load;
2585 sds->busiest_has_capacity = sgs.group_has_capacity;
2561 sds->group_imb = sgs.group_imb; 2586 sds->group_imb = sgs.group_imb;
2562 } 2587 }
2563 2588
@@ -2754,6 +2779,7 @@ static inline void calculate_imbalance(struct sd_lb_stats *sds, int this_cpu,
2754 return fix_small_imbalance(sds, this_cpu, imbalance); 2779 return fix_small_imbalance(sds, this_cpu, imbalance);
2755 2780
2756} 2781}
2782
2757/******* find_busiest_group() helpers end here *********************/ 2783/******* find_busiest_group() helpers end here *********************/
2758 2784
2759/** 2785/**
@@ -2805,6 +2831,11 @@ find_busiest_group(struct sched_domain *sd, int this_cpu,
2805 * 4) This group is more busy than the avg busieness at this 2831 * 4) This group is more busy than the avg busieness at this
2806 * sched_domain. 2832 * sched_domain.
2807 * 5) The imbalance is within the specified limit. 2833 * 5) The imbalance is within the specified limit.
2834 *
2835 * Note: when doing newidle balance, if the local group has excess
2836 * capacity (i.e. nr_running < group_capacity) and the busiest group
2837 * does not have any capacity, we force a load balance to pull tasks
2838 * to the local group. In this case, we skip past checks 3, 4 and 5.
2808 */ 2839 */
2809 if (!(*balance)) 2840 if (!(*balance))
2810 goto ret; 2841 goto ret;
@@ -2816,6 +2847,11 @@ find_busiest_group(struct sched_domain *sd, int this_cpu,
2816 if (!sds.busiest || sds.busiest_nr_running == 0) 2847 if (!sds.busiest || sds.busiest_nr_running == 0)
2817 goto out_balanced; 2848 goto out_balanced;
2818 2849
2850 /* SD_BALANCE_NEWIDLE trumps SMP nice when underutilized */
2851 if (idle == CPU_NEWLY_IDLE && sds.this_has_capacity &&
2852 !sds.busiest_has_capacity)
2853 goto force_balance;
2854
2819 if (sds.this_load >= sds.max_load) 2855 if (sds.this_load >= sds.max_load)
2820 goto out_balanced; 2856 goto out_balanced;
2821 2857
@@ -2827,6 +2863,7 @@ find_busiest_group(struct sched_domain *sd, int this_cpu,
2827 if (100 * sds.max_load <= sd->imbalance_pct * sds.this_load) 2863 if (100 * sds.max_load <= sd->imbalance_pct * sds.this_load)
2828 goto out_balanced; 2864 goto out_balanced;
2829 2865
2866force_balance:
2830 /* Looks like there is an imbalance. Compute it */ 2867 /* Looks like there is an imbalance. Compute it */
2831 calculate_imbalance(&sds, this_cpu, imbalance); 2868 calculate_imbalance(&sds, this_cpu, imbalance);
2832 return sds.busiest; 2869 return sds.busiest;
@@ -3031,7 +3068,14 @@ redo:
3031 3068
3032 if (!ld_moved) { 3069 if (!ld_moved) {
3033 schedstat_inc(sd, lb_failed[idle]); 3070 schedstat_inc(sd, lb_failed[idle]);
3034 sd->nr_balance_failed++; 3071 /*
3072 * Increment the failure counter only on periodic balance.
3073 * We do not want newidle balance, which can be very
3074 * frequent, pollute the failure counter causing
3075 * excessive cache_hot migrations and active balances.
3076 */
3077 if (idle != CPU_NEWLY_IDLE)
3078 sd->nr_balance_failed++;
3035 3079
3036 if (need_active_balance(sd, sd_idle, idle, cpu_of(busiest), 3080 if (need_active_balance(sd, sd_idle, idle, cpu_of(busiest),
3037 this_cpu)) { 3081 this_cpu)) {
@@ -3153,10 +3197,8 @@ static void idle_balance(int this_cpu, struct rq *this_rq)
3153 interval = msecs_to_jiffies(sd->balance_interval); 3197 interval = msecs_to_jiffies(sd->balance_interval);
3154 if (time_after(next_balance, sd->last_balance + interval)) 3198 if (time_after(next_balance, sd->last_balance + interval))
3155 next_balance = sd->last_balance + interval; 3199 next_balance = sd->last_balance + interval;
3156 if (pulled_task) { 3200 if (pulled_task)
3157 this_rq->idle_stamp = 0;
3158 break; 3201 break;
3159 }
3160 } 3202 }
3161 3203
3162 raw_spin_lock(&this_rq->lock); 3204 raw_spin_lock(&this_rq->lock);
@@ -3751,8 +3793,11 @@ static void task_fork_fair(struct task_struct *p)
3751 3793
3752 update_rq_clock(rq); 3794 update_rq_clock(rq);
3753 3795
3754 if (unlikely(task_cpu(p) != this_cpu)) 3796 if (unlikely(task_cpu(p) != this_cpu)) {
3797 rcu_read_lock();
3755 __set_task_cpu(p, this_cpu); 3798 __set_task_cpu(p, this_cpu);
3799 rcu_read_unlock();
3800 }
3756 3801
3757 update_curr(cfs_rq); 3802 update_curr(cfs_rq);
3758 3803
diff --git a/kernel/sched_features.h b/kernel/sched_features.h
index 83c66e8ad3ee..185f920ec1a2 100644
--- a/kernel/sched_features.h
+++ b/kernel/sched_features.h
@@ -61,3 +61,8 @@ SCHED_FEAT(ASYM_EFF_LOAD, 1)
61 * release the lock. Decreases scheduling overhead. 61 * release the lock. Decreases scheduling overhead.
62 */ 62 */
63SCHED_FEAT(OWNER_SPIN, 1) 63SCHED_FEAT(OWNER_SPIN, 1)
64
65/*
66 * Decrement CPU power based on irq activity
67 */
68SCHED_FEAT(NONIRQ_POWER, 1)
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index d10c80ebb67a..bea7d79f7e9c 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -609,7 +609,7 @@ static void update_curr_rt(struct rq *rq)
609 if (!task_has_rt_policy(curr)) 609 if (!task_has_rt_policy(curr))
610 return; 610 return;
611 611
612 delta_exec = rq->clock - curr->se.exec_start; 612 delta_exec = rq->clock_task - curr->se.exec_start;
613 if (unlikely((s64)delta_exec < 0)) 613 if (unlikely((s64)delta_exec < 0))
614 delta_exec = 0; 614 delta_exec = 0;
615 615
@@ -618,7 +618,7 @@ static void update_curr_rt(struct rq *rq)
618 curr->se.sum_exec_runtime += delta_exec; 618 curr->se.sum_exec_runtime += delta_exec;
619 account_group_exec_runtime(curr, delta_exec); 619 account_group_exec_runtime(curr, delta_exec);
620 620
621 curr->se.exec_start = rq->clock; 621 curr->se.exec_start = rq->clock_task;
622 cpuacct_charge(curr, delta_exec); 622 cpuacct_charge(curr, delta_exec);
623 623
624 sched_rt_avg_update(rq, delta_exec); 624 sched_rt_avg_update(rq, delta_exec);
@@ -960,18 +960,19 @@ select_task_rq_rt(struct rq *rq, struct task_struct *p, int sd_flag, int flags)
960 * runqueue. Otherwise simply start this RT task 960 * runqueue. Otherwise simply start this RT task
961 * on its current runqueue. 961 * on its current runqueue.
962 * 962 *
963 * We want to avoid overloading runqueues. Even if 963 * We want to avoid overloading runqueues. If the woken
964 * the RT task is of higher priority than the current RT task. 964 * task is a higher priority, then it will stay on this CPU
965 * RT tasks behave differently than other tasks. If 965 * and the lower prio task should be moved to another CPU.
966 * one gets preempted, we try to push it off to another queue. 966 * Even though this will probably make the lower prio task
967 * So trying to keep a preempting RT task on the same 967 * lose its cache, we do not want to bounce a higher task
968 * cache hot CPU will force the running RT task to 968 * around just because it gave up its CPU, perhaps for a
969 * a cold CPU. So we waste all the cache for the lower 969 * lock?
970 * RT task in hopes of saving some of a RT task 970 *
971 * that is just being woken and probably will have 971 * For equal prio tasks, we just let the scheduler sort it out.
972 * cold cache anyway.
973 */ 972 */
974 if (unlikely(rt_task(rq->curr)) && 973 if (unlikely(rt_task(rq->curr)) &&
974 (rq->curr->rt.nr_cpus_allowed < 2 ||
975 rq->curr->prio < p->prio) &&
975 (p->rt.nr_cpus_allowed > 1)) { 976 (p->rt.nr_cpus_allowed > 1)) {
976 int cpu = find_lowest_rq(p); 977 int cpu = find_lowest_rq(p);
977 978
@@ -1074,7 +1075,7 @@ static struct task_struct *_pick_next_task_rt(struct rq *rq)
1074 } while (rt_rq); 1075 } while (rt_rq);
1075 1076
1076 p = rt_task_of(rt_se); 1077 p = rt_task_of(rt_se);
1077 p->se.exec_start = rq->clock; 1078 p->se.exec_start = rq->clock_task;
1078 1079
1079 return p; 1080 return p;
1080} 1081}
@@ -1139,7 +1140,7 @@ static struct task_struct *pick_next_highest_task_rt(struct rq *rq, int cpu)
1139 for_each_leaf_rt_rq(rt_rq, rq) { 1140 for_each_leaf_rt_rq(rt_rq, rq) {
1140 array = &rt_rq->active; 1141 array = &rt_rq->active;
1141 idx = sched_find_first_bit(array->bitmap); 1142 idx = sched_find_first_bit(array->bitmap);
1142 next_idx: 1143next_idx:
1143 if (idx >= MAX_RT_PRIO) 1144 if (idx >= MAX_RT_PRIO)
1144 continue; 1145 continue;
1145 if (next && next->prio < idx) 1146 if (next && next->prio < idx)
@@ -1315,7 +1316,7 @@ static int push_rt_task(struct rq *rq)
1315 if (!next_task) 1316 if (!next_task)
1316 return 0; 1317 return 0;
1317 1318
1318 retry: 1319retry:
1319 if (unlikely(next_task == rq->curr)) { 1320 if (unlikely(next_task == rq->curr)) {
1320 WARN_ON(1); 1321 WARN_ON(1);
1321 return 0; 1322 return 0;
@@ -1463,7 +1464,7 @@ static int pull_rt_task(struct rq *this_rq)
1463 * but possible) 1464 * but possible)
1464 */ 1465 */
1465 } 1466 }
1466 skip: 1467skip:
1467 double_unlock_balance(this_rq, src_rq); 1468 double_unlock_balance(this_rq, src_rq);
1468 } 1469 }
1469 1470
@@ -1491,7 +1492,10 @@ static void task_woken_rt(struct rq *rq, struct task_struct *p)
1491 if (!task_running(rq, p) && 1492 if (!task_running(rq, p) &&
1492 !test_tsk_need_resched(rq->curr) && 1493 !test_tsk_need_resched(rq->curr) &&
1493 has_pushable_tasks(rq) && 1494 has_pushable_tasks(rq) &&
1494 p->rt.nr_cpus_allowed > 1) 1495 p->rt.nr_cpus_allowed > 1 &&
1496 rt_task(rq->curr) &&
1497 (rq->curr->rt.nr_cpus_allowed < 2 ||
1498 rq->curr->prio < p->prio))
1495 push_rt_tasks(rq); 1499 push_rt_tasks(rq);
1496} 1500}
1497 1501
@@ -1709,7 +1713,7 @@ static void set_curr_task_rt(struct rq *rq)
1709{ 1713{
1710 struct task_struct *p = rq->curr; 1714 struct task_struct *p = rq->curr;
1711 1715
1712 p->se.exec_start = rq->clock; 1716 p->se.exec_start = rq->clock_task;
1713 1717
1714 /* The running task is never eligible for pushing */ 1718 /* The running task is never eligible for pushing */
1715 dequeue_pushable_task(rq, p); 1719 dequeue_pushable_task(rq, p);
diff --git a/kernel/sched_stoptask.c b/kernel/sched_stoptask.c
new file mode 100644
index 000000000000..45bddc0c1048
--- /dev/null
+++ b/kernel/sched_stoptask.c
@@ -0,0 +1,108 @@
1/*
2 * stop-task scheduling class.
3 *
4 * The stop task is the highest priority task in the system, it preempts
5 * everything and will be preempted by nothing.
6 *
7 * See kernel/stop_machine.c
8 */
9
10#ifdef CONFIG_SMP
11static int
12select_task_rq_stop(struct rq *rq, struct task_struct *p,
13 int sd_flag, int flags)
14{
15 return task_cpu(p); /* stop tasks as never migrate */
16}
17#endif /* CONFIG_SMP */
18
19static void
20check_preempt_curr_stop(struct rq *rq, struct task_struct *p, int flags)
21{
22 resched_task(rq->curr); /* we preempt everything */
23}
24
25static struct task_struct *pick_next_task_stop(struct rq *rq)
26{
27 struct task_struct *stop = rq->stop;
28
29 if (stop && stop->state == TASK_RUNNING)
30 return stop;
31
32 return NULL;
33}
34
35static void
36enqueue_task_stop(struct rq *rq, struct task_struct *p, int flags)
37{
38}
39
40static void
41dequeue_task_stop(struct rq *rq, struct task_struct *p, int flags)
42{
43}
44
45static void yield_task_stop(struct rq *rq)
46{
47 BUG(); /* the stop task should never yield, its pointless. */
48}
49
50static void put_prev_task_stop(struct rq *rq, struct task_struct *prev)
51{
52}
53
54static void task_tick_stop(struct rq *rq, struct task_struct *curr, int queued)
55{
56}
57
58static void set_curr_task_stop(struct rq *rq)
59{
60}
61
62static void switched_to_stop(struct rq *rq, struct task_struct *p,
63 int running)
64{
65 BUG(); /* its impossible to change to this class */
66}
67
68static void prio_changed_stop(struct rq *rq, struct task_struct *p,
69 int oldprio, int running)
70{
71 BUG(); /* how!?, what priority? */
72}
73
74static unsigned int
75get_rr_interval_stop(struct rq *rq, struct task_struct *task)
76{
77 return 0;
78}
79
80/*
81 * Simple, special scheduling class for the per-CPU stop tasks:
82 */
83static const struct sched_class stop_sched_class = {
84 .next = &rt_sched_class,
85
86 .enqueue_task = enqueue_task_stop,
87 .dequeue_task = dequeue_task_stop,
88 .yield_task = yield_task_stop,
89
90 .check_preempt_curr = check_preempt_curr_stop,
91
92 .pick_next_task = pick_next_task_stop,
93 .put_prev_task = put_prev_task_stop,
94
95#ifdef CONFIG_SMP
96 .select_task_rq = select_task_rq_stop,
97#endif
98
99 .set_curr_task = set_curr_task_stop,
100 .task_tick = task_tick_stop,
101
102 .get_rr_interval = get_rr_interval_stop,
103
104 .prio_changed = prio_changed_stop,
105 .switched_to = switched_to_stop,
106
107 /* no .task_new for stop tasks */
108};
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 07b4f1b1a73a..fc978889b194 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -77,11 +77,21 @@ void wakeup_softirqd(void)
77} 77}
78 78
79/* 79/*
80 * preempt_count and SOFTIRQ_OFFSET usage:
81 * - preempt_count is changed by SOFTIRQ_OFFSET on entering or leaving
82 * softirq processing.
83 * - preempt_count is changed by SOFTIRQ_DISABLE_OFFSET (= 2 * SOFTIRQ_OFFSET)
84 * on local_bh_disable or local_bh_enable.
85 * This lets us distinguish between whether we are currently processing
86 * softirq and whether we just have bh disabled.
87 */
88
89/*
80 * This one is for softirq.c-internal use, 90 * This one is for softirq.c-internal use,
81 * where hardirqs are disabled legitimately: 91 * where hardirqs are disabled legitimately:
82 */ 92 */
83#ifdef CONFIG_TRACE_IRQFLAGS 93#ifdef CONFIG_TRACE_IRQFLAGS
84static void __local_bh_disable(unsigned long ip) 94static void __local_bh_disable(unsigned long ip, unsigned int cnt)
85{ 95{
86 unsigned long flags; 96 unsigned long flags;
87 97
@@ -95,32 +105,43 @@ static void __local_bh_disable(unsigned long ip)
95 * We must manually increment preempt_count here and manually 105 * We must manually increment preempt_count here and manually
96 * call the trace_preempt_off later. 106 * call the trace_preempt_off later.
97 */ 107 */
98 preempt_count() += SOFTIRQ_OFFSET; 108 preempt_count() += cnt;
99 /* 109 /*
100 * Were softirqs turned off above: 110 * Were softirqs turned off above:
101 */ 111 */
102 if (softirq_count() == SOFTIRQ_OFFSET) 112 if (softirq_count() == cnt)
103 trace_softirqs_off(ip); 113 trace_softirqs_off(ip);
104 raw_local_irq_restore(flags); 114 raw_local_irq_restore(flags);
105 115
106 if (preempt_count() == SOFTIRQ_OFFSET) 116 if (preempt_count() == cnt)
107 trace_preempt_off(CALLER_ADDR0, get_parent_ip(CALLER_ADDR1)); 117 trace_preempt_off(CALLER_ADDR0, get_parent_ip(CALLER_ADDR1));
108} 118}
109#else /* !CONFIG_TRACE_IRQFLAGS */ 119#else /* !CONFIG_TRACE_IRQFLAGS */
110static inline void __local_bh_disable(unsigned long ip) 120static inline void __local_bh_disable(unsigned long ip, unsigned int cnt)
111{ 121{
112 add_preempt_count(SOFTIRQ_OFFSET); 122 add_preempt_count(cnt);
113 barrier(); 123 barrier();
114} 124}
115#endif /* CONFIG_TRACE_IRQFLAGS */ 125#endif /* CONFIG_TRACE_IRQFLAGS */
116 126
117void local_bh_disable(void) 127void local_bh_disable(void)
118{ 128{
119 __local_bh_disable((unsigned long)__builtin_return_address(0)); 129 __local_bh_disable((unsigned long)__builtin_return_address(0),
130 SOFTIRQ_DISABLE_OFFSET);
120} 131}
121 132
122EXPORT_SYMBOL(local_bh_disable); 133EXPORT_SYMBOL(local_bh_disable);
123 134
135static void __local_bh_enable(unsigned int cnt)
136{
137 WARN_ON_ONCE(in_irq());
138 WARN_ON_ONCE(!irqs_disabled());
139
140 if (softirq_count() == cnt)
141 trace_softirqs_on((unsigned long)__builtin_return_address(0));
142 sub_preempt_count(cnt);
143}
144
124/* 145/*
125 * Special-case - softirqs can safely be enabled in 146 * Special-case - softirqs can safely be enabled in
126 * cond_resched_softirq(), or by __do_softirq(), 147 * cond_resched_softirq(), or by __do_softirq(),
@@ -128,12 +149,7 @@ EXPORT_SYMBOL(local_bh_disable);
128 */ 149 */
129void _local_bh_enable(void) 150void _local_bh_enable(void)
130{ 151{
131 WARN_ON_ONCE(in_irq()); 152 __local_bh_enable(SOFTIRQ_DISABLE_OFFSET);
132 WARN_ON_ONCE(!irqs_disabled());
133
134 if (softirq_count() == SOFTIRQ_OFFSET)
135 trace_softirqs_on((unsigned long)__builtin_return_address(0));
136 sub_preempt_count(SOFTIRQ_OFFSET);
137} 153}
138 154
139EXPORT_SYMBOL(_local_bh_enable); 155EXPORT_SYMBOL(_local_bh_enable);
@@ -147,13 +163,13 @@ static inline void _local_bh_enable_ip(unsigned long ip)
147 /* 163 /*
148 * Are softirqs going to be turned on now: 164 * Are softirqs going to be turned on now:
149 */ 165 */
150 if (softirq_count() == SOFTIRQ_OFFSET) 166 if (softirq_count() == SOFTIRQ_DISABLE_OFFSET)
151 trace_softirqs_on(ip); 167 trace_softirqs_on(ip);
152 /* 168 /*
153 * Keep preemption disabled until we are done with 169 * Keep preemption disabled until we are done with
154 * softirq processing: 170 * softirq processing:
155 */ 171 */
156 sub_preempt_count(SOFTIRQ_OFFSET - 1); 172 sub_preempt_count(SOFTIRQ_DISABLE_OFFSET - 1);
157 173
158 if (unlikely(!in_interrupt() && local_softirq_pending())) 174 if (unlikely(!in_interrupt() && local_softirq_pending()))
159 do_softirq(); 175 do_softirq();
@@ -198,7 +214,8 @@ asmlinkage void __do_softirq(void)
198 pending = local_softirq_pending(); 214 pending = local_softirq_pending();
199 account_system_vtime(current); 215 account_system_vtime(current);
200 216
201 __local_bh_disable((unsigned long)__builtin_return_address(0)); 217 __local_bh_disable((unsigned long)__builtin_return_address(0),
218 SOFTIRQ_OFFSET);
202 lockdep_softirq_enter(); 219 lockdep_softirq_enter();
203 220
204 cpu = smp_processor_id(); 221 cpu = smp_processor_id();
@@ -245,7 +262,7 @@ restart:
245 lockdep_softirq_exit(); 262 lockdep_softirq_exit();
246 263
247 account_system_vtime(current); 264 account_system_vtime(current);
248 _local_bh_enable(); 265 __local_bh_enable(SOFTIRQ_OFFSET);
249} 266}
250 267
251#ifndef __ARCH_HAS_DO_SOFTIRQ 268#ifndef __ARCH_HAS_DO_SOFTIRQ
@@ -279,10 +296,16 @@ void irq_enter(void)
279 296
280 rcu_irq_enter(); 297 rcu_irq_enter();
281 if (idle_cpu(cpu) && !in_interrupt()) { 298 if (idle_cpu(cpu) && !in_interrupt()) {
282 __irq_enter(); 299 /*
300 * Prevent raise_softirq from needlessly waking up ksoftirqd
301 * here, as softirq will be serviced on return from interrupt.
302 */
303 local_bh_disable();
283 tick_check_idle(cpu); 304 tick_check_idle(cpu);
284 } else 305 _local_bh_enable();
285 __irq_enter(); 306 }
307
308 __irq_enter();
286} 309}
287 310
288#ifdef __ARCH_IRQ_EXIT_IRQS_DISABLED 311#ifdef __ARCH_IRQ_EXIT_IRQS_DISABLED
@@ -696,6 +719,7 @@ static int run_ksoftirqd(void * __bind_cpu)
696{ 719{
697 set_current_state(TASK_INTERRUPTIBLE); 720 set_current_state(TASK_INTERRUPTIBLE);
698 721
722 current->flags |= PF_KSOFTIRQD;
699 while (!kthread_should_stop()) { 723 while (!kthread_should_stop()) {
700 preempt_disable(); 724 preempt_disable();
701 if (!local_softirq_pending()) { 725 if (!local_softirq_pending()) {
@@ -886,17 +910,14 @@ int __init __weak early_irq_init(void)
886 return 0; 910 return 0;
887} 911}
888 912
913#ifdef CONFIG_GENERIC_HARDIRQS
889int __init __weak arch_probe_nr_irqs(void) 914int __init __weak arch_probe_nr_irqs(void)
890{ 915{
891 return 0; 916 return NR_IRQS_LEGACY;
892} 917}
893 918
894int __init __weak arch_early_irq_init(void) 919int __init __weak arch_early_irq_init(void)
895{ 920{
896 return 0; 921 return 0;
897} 922}
898 923#endif
899int __weak arch_init_chip_data(struct irq_desc *desc, int node)
900{
901 return 0;
902}
diff --git a/kernel/srcu.c b/kernel/srcu.c
index 2980da3fd509..c71e07500536 100644
--- a/kernel/srcu.c
+++ b/kernel/srcu.c
@@ -46,11 +46,9 @@ static int init_srcu_struct_fields(struct srcu_struct *sp)
46int __init_srcu_struct(struct srcu_struct *sp, const char *name, 46int __init_srcu_struct(struct srcu_struct *sp, const char *name,
47 struct lock_class_key *key) 47 struct lock_class_key *key)
48{ 48{
49#ifdef CONFIG_DEBUG_LOCK_ALLOC
50 /* Don't re-initialize a lock while it is held. */ 49 /* Don't re-initialize a lock while it is held. */
51 debug_check_no_locks_freed((void *)sp, sizeof(*sp)); 50 debug_check_no_locks_freed((void *)sp, sizeof(*sp));
52 lockdep_init_map(&sp->dep_map, name, key, 0); 51 lockdep_init_map(&sp->dep_map, name, key, 0);
53#endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
54 return init_srcu_struct_fields(sp); 52 return init_srcu_struct_fields(sp);
55} 53}
56EXPORT_SYMBOL_GPL(__init_srcu_struct); 54EXPORT_SYMBOL_GPL(__init_srcu_struct);
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 4372ccb25127..090c28812ce1 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -287,11 +287,12 @@ repeat:
287 goto repeat; 287 goto repeat;
288} 288}
289 289
290extern void sched_set_stop_task(int cpu, struct task_struct *stop);
291
290/* manage stopper for a cpu, mostly lifted from sched migration thread mgmt */ 292/* manage stopper for a cpu, mostly lifted from sched migration thread mgmt */
291static int __cpuinit cpu_stop_cpu_callback(struct notifier_block *nfb, 293static int __cpuinit cpu_stop_cpu_callback(struct notifier_block *nfb,
292 unsigned long action, void *hcpu) 294 unsigned long action, void *hcpu)
293{ 295{
294 struct sched_param param = { .sched_priority = MAX_RT_PRIO - 1 };
295 unsigned int cpu = (unsigned long)hcpu; 296 unsigned int cpu = (unsigned long)hcpu;
296 struct cpu_stopper *stopper = &per_cpu(cpu_stopper, cpu); 297 struct cpu_stopper *stopper = &per_cpu(cpu_stopper, cpu);
297 struct task_struct *p; 298 struct task_struct *p;
@@ -304,13 +305,13 @@ static int __cpuinit cpu_stop_cpu_callback(struct notifier_block *nfb,
304 cpu); 305 cpu);
305 if (IS_ERR(p)) 306 if (IS_ERR(p))
306 return NOTIFY_BAD; 307 return NOTIFY_BAD;
307 sched_setscheduler_nocheck(p, SCHED_FIFO, &param);
308 get_task_struct(p); 308 get_task_struct(p);
309 kthread_bind(p, cpu);
310 sched_set_stop_task(cpu, p);
309 stopper->thread = p; 311 stopper->thread = p;
310 break; 312 break;
311 313
312 case CPU_ONLINE: 314 case CPU_ONLINE:
313 kthread_bind(stopper->thread, cpu);
314 /* strictly unnecessary, as first user will wake it */ 315 /* strictly unnecessary, as first user will wake it */
315 wake_up_process(stopper->thread); 316 wake_up_process(stopper->thread);
316 /* mark enabled */ 317 /* mark enabled */
@@ -325,6 +326,7 @@ static int __cpuinit cpu_stop_cpu_callback(struct notifier_block *nfb,
325 { 326 {
326 struct cpu_stop_work *work; 327 struct cpu_stop_work *work;
327 328
329 sched_set_stop_task(cpu, NULL);
328 /* kill the stopper */ 330 /* kill the stopper */
329 kthread_stop(stopper->thread); 331 kthread_stop(stopper->thread);
330 /* drain remaining works */ 332 /* drain remaining works */
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index c63116863a80..d2321891538f 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -149,10 +149,18 @@ static void ntp_update_offset(long offset)
149 time_reftime = get_seconds(); 149 time_reftime = get_seconds();
150 150
151 offset64 = offset; 151 offset64 = offset;
152 freq_adj = (offset64 * secs) << 152 freq_adj = ntp_update_offset_fll(offset64, secs);
153 (NTP_SCALE_SHIFT - 2 * (SHIFT_PLL + 2 + time_constant));
154 153
155 freq_adj += ntp_update_offset_fll(offset64, secs); 154 /*
155 * Clamp update interval to reduce PLL gain with low
156 * sampling rate (e.g. intermittent network connection)
157 * to avoid instability.
158 */
159 if (unlikely(secs > 1 << (SHIFT_PLL + 1 + time_constant)))
160 secs = 1 << (SHIFT_PLL + 1 + time_constant);
161
162 freq_adj += (offset64 * secs) <<
163 (NTP_SCALE_SHIFT - 2 * (SHIFT_PLL + 2 + time_constant));
156 164
157 freq_adj = min(freq_adj + time_freq, MAXFREQ_SCALED); 165 freq_adj = min(freq_adj + time_freq, MAXFREQ_SCALED);
158 166
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 65fb077ea79c..ebd80d50c474 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1638,8 +1638,8 @@ ftrace_failures_open(struct inode *inode, struct file *file)
1638 1638
1639 ret = ftrace_avail_open(inode, file); 1639 ret = ftrace_avail_open(inode, file);
1640 if (!ret) { 1640 if (!ret) {
1641 m = (struct seq_file *)file->private_data; 1641 m = file->private_data;
1642 iter = (struct ftrace_iterator *)m->private; 1642 iter = m->private;
1643 iter->flags = FTRACE_ITER_FAILURES; 1643 iter->flags = FTRACE_ITER_FAILURES;
1644 } 1644 }
1645 1645
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 9ec59f541156..001bcd2ccf4a 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2196,7 +2196,7 @@ int tracing_open_generic(struct inode *inode, struct file *filp)
2196 2196
2197static int tracing_release(struct inode *inode, struct file *file) 2197static int tracing_release(struct inode *inode, struct file *file)
2198{ 2198{
2199 struct seq_file *m = (struct seq_file *)file->private_data; 2199 struct seq_file *m = file->private_data;
2200 struct trace_iterator *iter; 2200 struct trace_iterator *iter;
2201 int cpu; 2201 int cpu;
2202 2202
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index d39b3c5454a5..9021f8c0c0c3 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -343,6 +343,10 @@ void trace_function(struct trace_array *tr,
343 unsigned long ip, 343 unsigned long ip,
344 unsigned long parent_ip, 344 unsigned long parent_ip,
345 unsigned long flags, int pc); 345 unsigned long flags, int pc);
346void trace_graph_function(struct trace_array *tr,
347 unsigned long ip,
348 unsigned long parent_ip,
349 unsigned long flags, int pc);
346void trace_default_header(struct seq_file *m); 350void trace_default_header(struct seq_file *m);
347void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 351void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
348int trace_empty(struct trace_iterator *iter); 352int trace_empty(struct trace_iterator *iter);
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index ef49e9370b25..76b05980225c 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -262,6 +262,34 @@ int trace_graph_thresh_entry(struct ftrace_graph_ent *trace)
262 return trace_graph_entry(trace); 262 return trace_graph_entry(trace);
263} 263}
264 264
265static void
266__trace_graph_function(struct trace_array *tr,
267 unsigned long ip, unsigned long flags, int pc)
268{
269 u64 time = trace_clock_local();
270 struct ftrace_graph_ent ent = {
271 .func = ip,
272 .depth = 0,
273 };
274 struct ftrace_graph_ret ret = {
275 .func = ip,
276 .depth = 0,
277 .calltime = time,
278 .rettime = time,
279 };
280
281 __trace_graph_entry(tr, &ent, flags, pc);
282 __trace_graph_return(tr, &ret, flags, pc);
283}
284
285void
286trace_graph_function(struct trace_array *tr,
287 unsigned long ip, unsigned long parent_ip,
288 unsigned long flags, int pc)
289{
290 __trace_graph_function(tr, ip, flags, pc);
291}
292
265void __trace_graph_return(struct trace_array *tr, 293void __trace_graph_return(struct trace_array *tr,
266 struct ftrace_graph_ret *trace, 294 struct ftrace_graph_ret *trace,
267 unsigned long flags, 295 unsigned long flags,
@@ -888,12 +916,20 @@ check_irq_entry(struct trace_iterator *iter, u32 flags,
888 unsigned long addr, int depth) 916 unsigned long addr, int depth)
889{ 917{
890 int cpu = iter->cpu; 918 int cpu = iter->cpu;
919 int *depth_irq;
891 struct fgraph_data *data = iter->private; 920 struct fgraph_data *data = iter->private;
892 int *depth_irq = &(per_cpu_ptr(data->cpu_data, cpu)->depth_irq);
893 921
894 if (flags & TRACE_GRAPH_PRINT_IRQS) 922 /*
923 * If we are either displaying irqs, or we got called as
924 * a graph event and private data does not exist,
925 * then we bypass the irq check.
926 */
927 if ((flags & TRACE_GRAPH_PRINT_IRQS) ||
928 (!data))
895 return 0; 929 return 0;
896 930
931 depth_irq = &(per_cpu_ptr(data->cpu_data, cpu)->depth_irq);
932
897 /* 933 /*
898 * We are inside the irq code 934 * We are inside the irq code
899 */ 935 */
@@ -926,12 +962,20 @@ static int
926check_irq_return(struct trace_iterator *iter, u32 flags, int depth) 962check_irq_return(struct trace_iterator *iter, u32 flags, int depth)
927{ 963{
928 int cpu = iter->cpu; 964 int cpu = iter->cpu;
965 int *depth_irq;
929 struct fgraph_data *data = iter->private; 966 struct fgraph_data *data = iter->private;
930 int *depth_irq = &(per_cpu_ptr(data->cpu_data, cpu)->depth_irq);
931 967
932 if (flags & TRACE_GRAPH_PRINT_IRQS) 968 /*
969 * If we are either displaying irqs, or we got called as
970 * a graph event and private data does not exist,
971 * then we bypass the irq check.
972 */
973 if ((flags & TRACE_GRAPH_PRINT_IRQS) ||
974 (!data))
933 return 0; 975 return 0;
934 976
977 depth_irq = &(per_cpu_ptr(data->cpu_data, cpu)->depth_irq);
978
935 /* 979 /*
936 * We are not inside the irq code. 980 * We are not inside the irq code.
937 */ 981 */
@@ -1163,7 +1207,7 @@ print_graph_comment(struct trace_seq *s, struct trace_entry *ent,
1163 1207
1164 1208
1165enum print_line_t 1209enum print_line_t
1166print_graph_function_flags(struct trace_iterator *iter, u32 flags) 1210__print_graph_function_flags(struct trace_iterator *iter, u32 flags)
1167{ 1211{
1168 struct ftrace_graph_ent_entry *field; 1212 struct ftrace_graph_ent_entry *field;
1169 struct fgraph_data *data = iter->private; 1213 struct fgraph_data *data = iter->private;
@@ -1226,7 +1270,18 @@ print_graph_function_flags(struct trace_iterator *iter, u32 flags)
1226static enum print_line_t 1270static enum print_line_t
1227print_graph_function(struct trace_iterator *iter) 1271print_graph_function(struct trace_iterator *iter)
1228{ 1272{
1229 return print_graph_function_flags(iter, tracer_flags.val); 1273 return __print_graph_function_flags(iter, tracer_flags.val);
1274}
1275
1276enum print_line_t print_graph_function_flags(struct trace_iterator *iter,
1277 u32 flags)
1278{
1279 if (trace_flags & TRACE_ITER_LATENCY_FMT)
1280 flags |= TRACE_GRAPH_PRINT_DURATION;
1281 else
1282 flags |= TRACE_GRAPH_PRINT_ABS_TIME;
1283
1284 return __print_graph_function_flags(iter, flags);
1230} 1285}
1231 1286
1232static enum print_line_t 1287static enum print_line_t
@@ -1258,7 +1313,7 @@ static void print_lat_header(struct seq_file *s, u32 flags)
1258 seq_printf(s, "#%.*s|||| / \n", size, spaces); 1313 seq_printf(s, "#%.*s|||| / \n", size, spaces);
1259} 1314}
1260 1315
1261void print_graph_headers_flags(struct seq_file *s, u32 flags) 1316static void __print_graph_headers_flags(struct seq_file *s, u32 flags)
1262{ 1317{
1263 int lat = trace_flags & TRACE_ITER_LATENCY_FMT; 1318 int lat = trace_flags & TRACE_ITER_LATENCY_FMT;
1264 1319
@@ -1299,6 +1354,23 @@ void print_graph_headers(struct seq_file *s)
1299 print_graph_headers_flags(s, tracer_flags.val); 1354 print_graph_headers_flags(s, tracer_flags.val);
1300} 1355}
1301 1356
1357void print_graph_headers_flags(struct seq_file *s, u32 flags)
1358{
1359 struct trace_iterator *iter = s->private;
1360
1361 if (trace_flags & TRACE_ITER_LATENCY_FMT) {
1362 /* print nothing if the buffers are empty */
1363 if (trace_empty(iter))
1364 return;
1365
1366 print_trace_header(s, iter);
1367 flags |= TRACE_GRAPH_PRINT_DURATION;
1368 } else
1369 flags |= TRACE_GRAPH_PRINT_ABS_TIME;
1370
1371 __print_graph_headers_flags(s, flags);
1372}
1373
1302void graph_trace_open(struct trace_iterator *iter) 1374void graph_trace_open(struct trace_iterator *iter)
1303{ 1375{
1304 /* pid and depth on the last trace processed */ 1376 /* pid and depth on the last trace processed */
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index 73a6b0601f2e..5cf8c602b880 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -87,14 +87,22 @@ static __cacheline_aligned_in_smp unsigned long max_sequence;
87 87
88#ifdef CONFIG_FUNCTION_TRACER 88#ifdef CONFIG_FUNCTION_TRACER
89/* 89/*
90 * irqsoff uses its own tracer function to keep the overhead down: 90 * Prologue for the preempt and irqs off function tracers.
91 *
92 * Returns 1 if it is OK to continue, and data->disabled is
93 * incremented.
94 * 0 if the trace is to be ignored, and data->disabled
95 * is kept the same.
96 *
97 * Note, this function is also used outside this ifdef but
98 * inside the #ifdef of the function graph tracer below.
99 * This is OK, since the function graph tracer is
100 * dependent on the function tracer.
91 */ 101 */
92static void 102static int func_prolog_dec(struct trace_array *tr,
93irqsoff_tracer_call(unsigned long ip, unsigned long parent_ip) 103 struct trace_array_cpu **data,
104 unsigned long *flags)
94{ 105{
95 struct trace_array *tr = irqsoff_trace;
96 struct trace_array_cpu *data;
97 unsigned long flags;
98 long disabled; 106 long disabled;
99 int cpu; 107 int cpu;
100 108
@@ -106,18 +114,38 @@ irqsoff_tracer_call(unsigned long ip, unsigned long parent_ip)
106 */ 114 */
107 cpu = raw_smp_processor_id(); 115 cpu = raw_smp_processor_id();
108 if (likely(!per_cpu(tracing_cpu, cpu))) 116 if (likely(!per_cpu(tracing_cpu, cpu)))
109 return; 117 return 0;
110 118
111 local_save_flags(flags); 119 local_save_flags(*flags);
112 /* slight chance to get a false positive on tracing_cpu */ 120 /* slight chance to get a false positive on tracing_cpu */
113 if (!irqs_disabled_flags(flags)) 121 if (!irqs_disabled_flags(*flags))
114 return; 122 return 0;
115 123
116 data = tr->data[cpu]; 124 *data = tr->data[cpu];
117 disabled = atomic_inc_return(&data->disabled); 125 disabled = atomic_inc_return(&(*data)->disabled);
118 126
119 if (likely(disabled == 1)) 127 if (likely(disabled == 1))
120 trace_function(tr, ip, parent_ip, flags, preempt_count()); 128 return 1;
129
130 atomic_dec(&(*data)->disabled);
131
132 return 0;
133}
134
135/*
136 * irqsoff uses its own tracer function to keep the overhead down:
137 */
138static void
139irqsoff_tracer_call(unsigned long ip, unsigned long parent_ip)
140{
141 struct trace_array *tr = irqsoff_trace;
142 struct trace_array_cpu *data;
143 unsigned long flags;
144
145 if (!func_prolog_dec(tr, &data, &flags))
146 return;
147
148 trace_function(tr, ip, parent_ip, flags, preempt_count());
121 149
122 atomic_dec(&data->disabled); 150 atomic_dec(&data->disabled);
123} 151}
@@ -155,30 +183,16 @@ static int irqsoff_graph_entry(struct ftrace_graph_ent *trace)
155 struct trace_array *tr = irqsoff_trace; 183 struct trace_array *tr = irqsoff_trace;
156 struct trace_array_cpu *data; 184 struct trace_array_cpu *data;
157 unsigned long flags; 185 unsigned long flags;
158 long disabled;
159 int ret; 186 int ret;
160 int cpu;
161 int pc; 187 int pc;
162 188
163 cpu = raw_smp_processor_id(); 189 if (!func_prolog_dec(tr, &data, &flags))
164 if (likely(!per_cpu(tracing_cpu, cpu)))
165 return 0; 190 return 0;
166 191
167 local_save_flags(flags); 192 pc = preempt_count();
168 /* slight chance to get a false positive on tracing_cpu */ 193 ret = __trace_graph_entry(tr, trace, flags, pc);
169 if (!irqs_disabled_flags(flags))
170 return 0;
171
172 data = tr->data[cpu];
173 disabled = atomic_inc_return(&data->disabled);
174
175 if (likely(disabled == 1)) {
176 pc = preempt_count();
177 ret = __trace_graph_entry(tr, trace, flags, pc);
178 } else
179 ret = 0;
180
181 atomic_dec(&data->disabled); 194 atomic_dec(&data->disabled);
195
182 return ret; 196 return ret;
183} 197}
184 198
@@ -187,27 +201,13 @@ static void irqsoff_graph_return(struct ftrace_graph_ret *trace)
187 struct trace_array *tr = irqsoff_trace; 201 struct trace_array *tr = irqsoff_trace;
188 struct trace_array_cpu *data; 202 struct trace_array_cpu *data;
189 unsigned long flags; 203 unsigned long flags;
190 long disabled;
191 int cpu;
192 int pc; 204 int pc;
193 205
194 cpu = raw_smp_processor_id(); 206 if (!func_prolog_dec(tr, &data, &flags))
195 if (likely(!per_cpu(tracing_cpu, cpu)))
196 return; 207 return;
197 208
198 local_save_flags(flags); 209 pc = preempt_count();
199 /* slight chance to get a false positive on tracing_cpu */ 210 __trace_graph_return(tr, trace, flags, pc);
200 if (!irqs_disabled_flags(flags))
201 return;
202
203 data = tr->data[cpu];
204 disabled = atomic_inc_return(&data->disabled);
205
206 if (likely(disabled == 1)) {
207 pc = preempt_count();
208 __trace_graph_return(tr, trace, flags, pc);
209 }
210
211 atomic_dec(&data->disabled); 211 atomic_dec(&data->disabled);
212} 212}
213 213
@@ -229,75 +229,33 @@ static void irqsoff_trace_close(struct trace_iterator *iter)
229 229
230static enum print_line_t irqsoff_print_line(struct trace_iterator *iter) 230static enum print_line_t irqsoff_print_line(struct trace_iterator *iter)
231{ 231{
232 u32 flags = GRAPH_TRACER_FLAGS;
233
234 if (trace_flags & TRACE_ITER_LATENCY_FMT)
235 flags |= TRACE_GRAPH_PRINT_DURATION;
236 else
237 flags |= TRACE_GRAPH_PRINT_ABS_TIME;
238
239 /* 232 /*
240 * In graph mode call the graph tracer output function, 233 * In graph mode call the graph tracer output function,
241 * otherwise go with the TRACE_FN event handler 234 * otherwise go with the TRACE_FN event handler
242 */ 235 */
243 if (is_graph()) 236 if (is_graph())
244 return print_graph_function_flags(iter, flags); 237 return print_graph_function_flags(iter, GRAPH_TRACER_FLAGS);
245 238
246 return TRACE_TYPE_UNHANDLED; 239 return TRACE_TYPE_UNHANDLED;
247} 240}
248 241
249static void irqsoff_print_header(struct seq_file *s) 242static void irqsoff_print_header(struct seq_file *s)
250{ 243{
251 if (is_graph()) { 244 if (is_graph())
252 struct trace_iterator *iter = s->private; 245 print_graph_headers_flags(s, GRAPH_TRACER_FLAGS);
253 u32 flags = GRAPH_TRACER_FLAGS; 246 else
254
255 if (trace_flags & TRACE_ITER_LATENCY_FMT) {
256 /* print nothing if the buffers are empty */
257 if (trace_empty(iter))
258 return;
259
260 print_trace_header(s, iter);
261 flags |= TRACE_GRAPH_PRINT_DURATION;
262 } else
263 flags |= TRACE_GRAPH_PRINT_ABS_TIME;
264
265 print_graph_headers_flags(s, flags);
266 } else
267 trace_default_header(s); 247 trace_default_header(s);
268} 248}
269 249
270static void 250static void
271trace_graph_function(struct trace_array *tr,
272 unsigned long ip, unsigned long flags, int pc)
273{
274 u64 time = trace_clock_local();
275 struct ftrace_graph_ent ent = {
276 .func = ip,
277 .depth = 0,
278 };
279 struct ftrace_graph_ret ret = {
280 .func = ip,
281 .depth = 0,
282 .calltime = time,
283 .rettime = time,
284 };
285
286 __trace_graph_entry(tr, &ent, flags, pc);
287 __trace_graph_return(tr, &ret, flags, pc);
288}
289
290static void
291__trace_function(struct trace_array *tr, 251__trace_function(struct trace_array *tr,
292 unsigned long ip, unsigned long parent_ip, 252 unsigned long ip, unsigned long parent_ip,
293 unsigned long flags, int pc) 253 unsigned long flags, int pc)
294{ 254{
295 if (!is_graph()) 255 if (is_graph())
256 trace_graph_function(tr, ip, parent_ip, flags, pc);
257 else
296 trace_function(tr, ip, parent_ip, flags, pc); 258 trace_function(tr, ip, parent_ip, flags, pc);
297 else {
298 trace_graph_function(tr, parent_ip, flags, pc);
299 trace_graph_function(tr, ip, flags, pc);
300 }
301} 259}
302 260
303#else 261#else
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index 4086eae6e81b..7319559ed59f 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -31,48 +31,98 @@ static int wakeup_rt;
31static arch_spinlock_t wakeup_lock = 31static arch_spinlock_t wakeup_lock =
32 (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED; 32 (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;
33 33
34static void wakeup_reset(struct trace_array *tr);
34static void __wakeup_reset(struct trace_array *tr); 35static void __wakeup_reset(struct trace_array *tr);
36static int wakeup_graph_entry(struct ftrace_graph_ent *trace);
37static void wakeup_graph_return(struct ftrace_graph_ret *trace);
35 38
36static int save_lat_flag; 39static int save_lat_flag;
37 40
41#define TRACE_DISPLAY_GRAPH 1
42
43static struct tracer_opt trace_opts[] = {
44#ifdef CONFIG_FUNCTION_GRAPH_TRACER
45 /* display latency trace as call graph */
46 { TRACER_OPT(display-graph, TRACE_DISPLAY_GRAPH) },
47#endif
48 { } /* Empty entry */
49};
50
51static struct tracer_flags tracer_flags = {
52 .val = 0,
53 .opts = trace_opts,
54};
55
56#define is_graph() (tracer_flags.val & TRACE_DISPLAY_GRAPH)
57
38#ifdef CONFIG_FUNCTION_TRACER 58#ifdef CONFIG_FUNCTION_TRACER
59
39/* 60/*
40 * irqsoff uses its own tracer function to keep the overhead down: 61 * Prologue for the wakeup function tracers.
62 *
63 * Returns 1 if it is OK to continue, and preemption
64 * is disabled and data->disabled is incremented.
65 * 0 if the trace is to be ignored, and preemption
66 * is not disabled and data->disabled is
67 * kept the same.
68 *
69 * Note, this function is also used outside this ifdef but
70 * inside the #ifdef of the function graph tracer below.
71 * This is OK, since the function graph tracer is
72 * dependent on the function tracer.
41 */ 73 */
42static void 74static int
43wakeup_tracer_call(unsigned long ip, unsigned long parent_ip) 75func_prolog_preempt_disable(struct trace_array *tr,
76 struct trace_array_cpu **data,
77 int *pc)
44{ 78{
45 struct trace_array *tr = wakeup_trace;
46 struct trace_array_cpu *data;
47 unsigned long flags;
48 long disabled; 79 long disabled;
49 int cpu; 80 int cpu;
50 int pc;
51 81
52 if (likely(!wakeup_task)) 82 if (likely(!wakeup_task))
53 return; 83 return 0;
54 84
55 pc = preempt_count(); 85 *pc = preempt_count();
56 preempt_disable_notrace(); 86 preempt_disable_notrace();
57 87
58 cpu = raw_smp_processor_id(); 88 cpu = raw_smp_processor_id();
59 if (cpu != wakeup_current_cpu) 89 if (cpu != wakeup_current_cpu)
60 goto out_enable; 90 goto out_enable;
61 91
62 data = tr->data[cpu]; 92 *data = tr->data[cpu];
63 disabled = atomic_inc_return(&data->disabled); 93 disabled = atomic_inc_return(&(*data)->disabled);
64 if (unlikely(disabled != 1)) 94 if (unlikely(disabled != 1))
65 goto out; 95 goto out;
66 96
67 local_irq_save(flags); 97 return 1;
68 98
69 trace_function(tr, ip, parent_ip, flags, pc); 99out:
100 atomic_dec(&(*data)->disabled);
101
102out_enable:
103 preempt_enable_notrace();
104 return 0;
105}
70 106
107/*
108 * wakeup uses its own tracer function to keep the overhead down:
109 */
110static void
111wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
112{
113 struct trace_array *tr = wakeup_trace;
114 struct trace_array_cpu *data;
115 unsigned long flags;
116 int pc;
117
118 if (!func_prolog_preempt_disable(tr, &data, &pc))
119 return;
120
121 local_irq_save(flags);
122 trace_function(tr, ip, parent_ip, flags, pc);
71 local_irq_restore(flags); 123 local_irq_restore(flags);
72 124
73 out:
74 atomic_dec(&data->disabled); 125 atomic_dec(&data->disabled);
75 out_enable:
76 preempt_enable_notrace(); 126 preempt_enable_notrace();
77} 127}
78 128
@@ -82,6 +132,156 @@ static struct ftrace_ops trace_ops __read_mostly =
82}; 132};
83#endif /* CONFIG_FUNCTION_TRACER */ 133#endif /* CONFIG_FUNCTION_TRACER */
84 134
135static int start_func_tracer(int graph)
136{
137 int ret;
138
139 if (!graph)
140 ret = register_ftrace_function(&trace_ops);
141 else
142 ret = register_ftrace_graph(&wakeup_graph_return,
143 &wakeup_graph_entry);
144
145 if (!ret && tracing_is_enabled())
146 tracer_enabled = 1;
147 else
148 tracer_enabled = 0;
149
150 return ret;
151}
152
153static void stop_func_tracer(int graph)
154{
155 tracer_enabled = 0;
156
157 if (!graph)
158 unregister_ftrace_function(&trace_ops);
159 else
160 unregister_ftrace_graph();
161}
162
163#ifdef CONFIG_FUNCTION_GRAPH_TRACER
164static int wakeup_set_flag(u32 old_flags, u32 bit, int set)
165{
166
167 if (!(bit & TRACE_DISPLAY_GRAPH))
168 return -EINVAL;
169
170 if (!(is_graph() ^ set))
171 return 0;
172
173 stop_func_tracer(!set);
174
175 wakeup_reset(wakeup_trace);
176 tracing_max_latency = 0;
177
178 return start_func_tracer(set);
179}
180
181static int wakeup_graph_entry(struct ftrace_graph_ent *trace)
182{
183 struct trace_array *tr = wakeup_trace;
184 struct trace_array_cpu *data;
185 unsigned long flags;
186 int pc, ret = 0;
187
188 if (!func_prolog_preempt_disable(tr, &data, &pc))
189 return 0;
190
191 local_save_flags(flags);
192 ret = __trace_graph_entry(tr, trace, flags, pc);
193 atomic_dec(&data->disabled);
194 preempt_enable_notrace();
195
196 return ret;
197}
198
199static void wakeup_graph_return(struct ftrace_graph_ret *trace)
200{
201 struct trace_array *tr = wakeup_trace;
202 struct trace_array_cpu *data;
203 unsigned long flags;
204 int pc;
205
206 if (!func_prolog_preempt_disable(tr, &data, &pc))
207 return;
208
209 local_save_flags(flags);
210 __trace_graph_return(tr, trace, flags, pc);
211 atomic_dec(&data->disabled);
212
213 preempt_enable_notrace();
214 return;
215}
216
217static void wakeup_trace_open(struct trace_iterator *iter)
218{
219 if (is_graph())
220 graph_trace_open(iter);
221}
222
223static void wakeup_trace_close(struct trace_iterator *iter)
224{
225 if (iter->private)
226 graph_trace_close(iter);
227}
228
229#define GRAPH_TRACER_FLAGS (TRACE_GRAPH_PRINT_PROC)
230
231static enum print_line_t wakeup_print_line(struct trace_iterator *iter)
232{
233 /*
234 * In graph mode call the graph tracer output function,
235 * otherwise go with the TRACE_FN event handler
236 */
237 if (is_graph())
238 return print_graph_function_flags(iter, GRAPH_TRACER_FLAGS);
239
240 return TRACE_TYPE_UNHANDLED;
241}
242
243static void wakeup_print_header(struct seq_file *s)
244{
245 if (is_graph())
246 print_graph_headers_flags(s, GRAPH_TRACER_FLAGS);
247 else
248 trace_default_header(s);
249}
250
251static void
252__trace_function(struct trace_array *tr,
253 unsigned long ip, unsigned long parent_ip,
254 unsigned long flags, int pc)
255{
256 if (is_graph())
257 trace_graph_function(tr, ip, parent_ip, flags, pc);
258 else
259 trace_function(tr, ip, parent_ip, flags, pc);
260}
261#else
262#define __trace_function trace_function
263
264static int wakeup_set_flag(u32 old_flags, u32 bit, int set)
265{
266 return -EINVAL;
267}
268
269static int wakeup_graph_entry(struct ftrace_graph_ent *trace)
270{
271 return -1;
272}
273
274static enum print_line_t wakeup_print_line(struct trace_iterator *iter)
275{
276 return TRACE_TYPE_UNHANDLED;
277}
278
279static void wakeup_graph_return(struct ftrace_graph_ret *trace) { }
280static void wakeup_print_header(struct seq_file *s) { }
281static void wakeup_trace_open(struct trace_iterator *iter) { }
282static void wakeup_trace_close(struct trace_iterator *iter) { }
283#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
284
85/* 285/*
86 * Should this new latency be reported/recorded? 286 * Should this new latency be reported/recorded?
87 */ 287 */
@@ -152,7 +352,7 @@ probe_wakeup_sched_switch(void *ignore,
152 /* The task we are waiting for is waking up */ 352 /* The task we are waiting for is waking up */
153 data = wakeup_trace->data[wakeup_cpu]; 353 data = wakeup_trace->data[wakeup_cpu];
154 354
155 trace_function(wakeup_trace, CALLER_ADDR0, CALLER_ADDR1, flags, pc); 355 __trace_function(wakeup_trace, CALLER_ADDR0, CALLER_ADDR1, flags, pc);
156 tracing_sched_switch_trace(wakeup_trace, prev, next, flags, pc); 356 tracing_sched_switch_trace(wakeup_trace, prev, next, flags, pc);
157 357
158 T0 = data->preempt_timestamp; 358 T0 = data->preempt_timestamp;
@@ -252,7 +452,7 @@ probe_wakeup(void *ignore, struct task_struct *p, int success)
252 * is not called by an assembly function (where as schedule is) 452 * is not called by an assembly function (where as schedule is)
253 * it should be safe to use it here. 453 * it should be safe to use it here.
254 */ 454 */
255 trace_function(wakeup_trace, CALLER_ADDR1, CALLER_ADDR2, flags, pc); 455 __trace_function(wakeup_trace, CALLER_ADDR1, CALLER_ADDR2, flags, pc);
256 456
257out_locked: 457out_locked:
258 arch_spin_unlock(&wakeup_lock); 458 arch_spin_unlock(&wakeup_lock);
@@ -303,12 +503,8 @@ static void start_wakeup_tracer(struct trace_array *tr)
303 */ 503 */
304 smp_wmb(); 504 smp_wmb();
305 505
306 register_ftrace_function(&trace_ops); 506 if (start_func_tracer(is_graph()))
307 507 printk(KERN_ERR "failed to start wakeup tracer\n");
308 if (tracing_is_enabled())
309 tracer_enabled = 1;
310 else
311 tracer_enabled = 0;
312 508
313 return; 509 return;
314fail_deprobe_wake_new: 510fail_deprobe_wake_new:
@@ -320,7 +516,7 @@ fail_deprobe:
320static void stop_wakeup_tracer(struct trace_array *tr) 516static void stop_wakeup_tracer(struct trace_array *tr)
321{ 517{
322 tracer_enabled = 0; 518 tracer_enabled = 0;
323 unregister_ftrace_function(&trace_ops); 519 stop_func_tracer(is_graph());
324 unregister_trace_sched_switch(probe_wakeup_sched_switch, NULL); 520 unregister_trace_sched_switch(probe_wakeup_sched_switch, NULL);
325 unregister_trace_sched_wakeup_new(probe_wakeup, NULL); 521 unregister_trace_sched_wakeup_new(probe_wakeup, NULL);
326 unregister_trace_sched_wakeup(probe_wakeup, NULL); 522 unregister_trace_sched_wakeup(probe_wakeup, NULL);
@@ -379,9 +575,15 @@ static struct tracer wakeup_tracer __read_mostly =
379 .start = wakeup_tracer_start, 575 .start = wakeup_tracer_start,
380 .stop = wakeup_tracer_stop, 576 .stop = wakeup_tracer_stop,
381 .print_max = 1, 577 .print_max = 1,
578 .print_header = wakeup_print_header,
579 .print_line = wakeup_print_line,
580 .flags = &tracer_flags,
581 .set_flag = wakeup_set_flag,
382#ifdef CONFIG_FTRACE_SELFTEST 582#ifdef CONFIG_FTRACE_SELFTEST
383 .selftest = trace_selftest_startup_wakeup, 583 .selftest = trace_selftest_startup_wakeup,
384#endif 584#endif
585 .open = wakeup_trace_open,
586 .close = wakeup_trace_close,
385 .use_max_tr = 1, 587 .use_max_tr = 1,
386}; 588};
387 589
@@ -394,9 +596,15 @@ static struct tracer wakeup_rt_tracer __read_mostly =
394 .stop = wakeup_tracer_stop, 596 .stop = wakeup_tracer_stop,
395 .wait_pipe = poll_wait_pipe, 597 .wait_pipe = poll_wait_pipe,
396 .print_max = 1, 598 .print_max = 1,
599 .print_header = wakeup_print_header,
600 .print_line = wakeup_print_line,
601 .flags = &tracer_flags,
602 .set_flag = wakeup_set_flag,
397#ifdef CONFIG_FTRACE_SELFTEST 603#ifdef CONFIG_FTRACE_SELFTEST
398 .selftest = trace_selftest_startup_wakeup, 604 .selftest = trace_selftest_startup_wakeup,
399#endif 605#endif
606 .open = wakeup_trace_open,
607 .close = wakeup_trace_close,
400 .use_max_tr = 1, 608 .use_max_tr = 1,
401}; 609};
402 610
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index dc8e16824b51..bafba687a6d8 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -196,7 +196,7 @@ static struct perf_event_attr wd_hw_attr = {
196}; 196};
197 197
198/* Callback function for perf event subsystem */ 198/* Callback function for perf event subsystem */
199void watchdog_overflow_callback(struct perf_event *event, int nmi, 199static void watchdog_overflow_callback(struct perf_event *event, int nmi,
200 struct perf_sample_data *data, 200 struct perf_sample_data *data,
201 struct pt_regs *regs) 201 struct pt_regs *regs)
202{ 202{
generated by cgit v1.2.2 (git 2.25.0) at 2025-05-02 21:38:53 -0400