Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (52 commits)
  sched: fix RCU lockdep splat from task_group()
  rcu: using ACCESS_ONCE() to observe the jiffies_stall/rnp->qsmask value
  sched: suppress RCU lockdep splat in task_fork_fair
  net: suppress RCU lockdep false positive in sock_update_classid
  rcu: move check from rcu_dereference_bh to rcu_read_lock_bh_held
  rcu: Add advice to PROVE_RCU_REPEATEDLY kernel config parameter
  rcu: Add tracing data to support queueing models
  rcu: fix sparse errors in rcutorture.c
  rcu: only one evaluation of arg in rcu_dereference_check() unless sparse
  kernel: Remove undead ifdef CONFIG_DEBUG_LOCK_ALLOC
  rcu: fix _oddness handling of verbose stall warnings
  rcu: performance fixes to TINY_PREEMPT_RCU callback checking
  rcu: upgrade stallwarn.txt documentation for CPU-bound RT processes
  vhost: add __rcu annotations
  rcu: add comment stating that list_empty() applies to RCU-protected lists
  rcu: apply TINY_PREEMPT_RCU read-side speedup to TREE_PREEMPT_RCU
  rcu: combine duplicate code, courtesy of CONFIG_PREEMPT_RCU
  rcu: Upgrade srcu_read_lock() docbook about SRCU grace periods
  rcu: document ways of stalling updates in low-memory situations
  rcu: repair code-duplication FIXMEs
  ...

27 files changed, 527 insertions, 332 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 0c991023ee47..709dfb901d11 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -75,7 +75,7 @@ struct cgroup_subsys_state {
 
         unsigned long flags;
         /* ID for this css, if possible */
-        struct css_id *id;
+        struct css_id __rcu *id;
 };
 
 /* bits in struct cgroup_subsys_state flags field */
@@ -205,7 +205,7 @@ struct cgroup {
         struct list_head children;      /* my children */
 
         struct cgroup *parent;          /* my parent */
-        struct dentry *dentry;          /* cgroup fs entry, RCU protected */
+        struct dentry __rcu *dentry;    /* cgroup fs entry, RCU protected */
 
         /* Private pointers for each registered subsystem */
         struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT];
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index c1a62c56a660..320d6c94ff84 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -16,7 +16,11 @@
 # define __release(x)   __context__(x,-1)
 # define __cond_lock(x,c)       ((c) ? ({ __acquire(x); 1; }) : 0)
 # define __percpu       __attribute__((noderef, address_space(3)))
+#ifdef CONFIG_SPARSE_RCU_POINTER
+# define __rcu          __attribute__((noderef, address_space(4)))
+#else
 # define __rcu
+#endif
 extern void __chk_user_ptr(const volatile void __user *);
 extern void __chk_io_ptr(const volatile void __iomem *);
 #else
diff --git a/include/linux/cred.h b/include/linux/cred.h
index 4d2c39573f36..4aaeab376446 100644
--- a/include/linux/cred.h
+++ b/include/linux/cred.h
@@ -84,7 +84,7 @@ struct thread_group_cred {
         atomic_t        usage;
         pid_t           tgid;                   /* thread group process ID */
         spinlock_t      lock;
-        struct key      *session_keyring;       /* keyring inherited over fork */
+        struct key __rcu *session_keyring;      /* keyring inherited over fork */
         struct key      *process_keyring;       /* keyring private to this process */
         struct rcu_head rcu;                    /* RCU deletion hook */
 };
diff --git a/include/linux/fdtable.h b/include/linux/fdtable.h
index f59ed297b661..133c0ba25e30 100644
--- a/include/linux/fdtable.h
+++ b/include/linux/fdtable.h
@@ -31,7 +31,7 @@ struct embedded_fd_set {
 
 struct fdtable {
         unsigned int max_fds;
-        struct file ** fd;      /* current fd array */
+        struct file __rcu **fd;      /* current fd array */
         fd_set *close_on_exec;
         fd_set *open_fds;
         struct rcu_head rcu;
@@ -46,7 +46,7 @@ struct files_struct {
    * read mostly part
    */
         atomic_t count;
-        struct fdtable *fdt;
+        struct fdtable __rcu *fdt;
         struct fdtable fdtab;
   /*
    * written part on a separate cache line in SMP
@@ -55,7 +55,7 @@ struct files_struct {
         int next_fd;
         struct embedded_fd_set close_on_exec_init;
         struct embedded_fd_set open_fds_init;
-        struct file * fd_array[NR_OPEN_DEFAULT];
+        struct file __rcu * fd_array[NR_OPEN_DEFAULT];
 };
 
 #define rcu_dereference_check_fdtable(files, fdtfd) \
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 63d069bd80b7..3168dcfb94f2 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1384,7 +1384,7 @@ struct super_block {
          * Saved mount options for lazy filesystems using
          * generic_show_options()
          */
-        char *s_options;
+        char __rcu *s_options;
 };
 
 extern struct timespec current_fs_time(struct super_block *sb);
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 5f2f4c4d8fb0..af3f06b41dc1 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -129,8 +129,8 @@ struct blk_scsi_cmd_filter {
 struct disk_part_tbl {
         struct rcu_head rcu_head;
         int len;
-        struct hd_struct *last_lookup;
-        struct hd_struct *part[];
+        struct hd_struct __rcu *last_lookup;
+        struct hd_struct __rcu *part[];
 };
 
 struct gendisk {
@@ -149,7 +149,7 @@ struct gendisk {
          * non-critical accesses use RCU.  Always access through
          * helpers.
          */
-        struct disk_part_tbl *part_tbl;
+        struct disk_part_tbl __rcu *part_tbl;
         struct hd_struct part0;
 
         const struct block_device_operations *fops;
diff --git a/include/linux/hardirq.h b/include/linux/hardirq.h
index d5b387669dab..1f4517d55b19 100644
--- a/include/linux/hardirq.h
+++ b/include/linux/hardirq.h
@@ -139,7 +139,7 @@ static inline void account_system_vtime(struct task_struct *tsk)
 #endif
 
 #if defined(CONFIG_NO_HZ)
-#if defined(CONFIG_TINY_RCU)
+#if defined(CONFIG_TINY_RCU) || defined(CONFIG_TINY_PREEMPT_RCU)
 extern void rcu_enter_nohz(void);
 extern void rcu_exit_nohz(void);
 
diff --git a/include/linux/idr.h b/include/linux/idr.h
index e968db71e33a..cdb715e58e3e 100644
--- a/include/linux/idr.h
+++ b/include/linux/idr.h
@@ -50,14 +50,14 @@
 
 struct idr_layer {
         unsigned long            bitmap; /* A zero bit means "space here" */