9 files changed, 361 insertions, 113 deletions

diff --git a/kernel/bounds.c b/kernel/bounds.c
new file mode 100644
index 000000000000..c3c55544db2f
--- /dev/null
+++ b/kernel/bounds.c
@@ -0,0 +1,23 @@
+/*
+ * Generate definitions needed by the preprocessor.
+ * This code generates raw asm output which is post-processed
+ * to extract and format the required data.
+ */
+
+#define __GENERATING_BOUNDS_H
+/* Include headers that define the enum constants of interest */
+#include <linux/page-flags.h>
+#include <linux/mmzone.h>
+
+#define DEFINE(sym, val) \
+        asm volatile("\n->" #sym " %0 " #val : : "i" (val))
+
+#define BLANK() asm volatile("\n->" : : )
+
+void foo(void)
+{
+        /* The enum constants to put into include/linux/bounds.h */
+        DEFINE(NR_PAGEFLAGS, __NR_PAGEFLAGS);
+        DEFINE(MAX_NR_ZONES, __MAX_NR_ZONES);
+        /* End of constants */
+}
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 8b35fbd8292f..024888bb9814 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -941,7 +941,7 @@ static int update_nodemask(struct cpuset *cs, char *buf)
         cs->mems_generation = cpuset_mems_generation++;
         mutex_unlock(&callback_mutex);
 
-        cpuset_being_rebound = cs;              /* causes mpol_copy() rebind */
+        cpuset_being_rebound = cs;              /* causes mpol_dup() rebind */
 
         fudge = 10;                             /* spare mmarray[] slots */
         fudge += cpus_weight(cs->cpus_allowed); /* imagine one fork-bomb/cpu */
@@ -992,7 +992,7 @@ static int update_nodemask(struct cpuset *cs, char *buf)
          * rebind the vma mempolicies of each mm in mmarray[] to their
          * new cpuset, and release that mm.  The mpol_rebind_mm()
          * call takes mmap_sem, which we couldn't take while holding
-         * tasklist_lock.  Forks can happen again now - the mpol_copy()
+         * tasklist_lock.  Forks can happen again now - the mpol_dup()
          * cpuset_being_rebound check will catch such forks, and rebind
          * their vma mempolicies too.  Because we still hold the global
          * cgroup_mutex, we know that no other rebind effort will
@@ -1958,22 +1958,14 @@ nodemask_t cpuset_mems_allowed(struct task_struct *tsk)
 }
 
 /**
- * cpuset_zonelist_valid_mems_allowed - check zonelist vs. curremt mems_allowed
- * @zl: the zonelist to be checked
+ * cpuset_nodemask_valid_mems_allowed - check nodemask vs. curremt mems_allowed
+ * @nodemask: the nodemask to be checked
  *
- * Are any of the nodes on zonelist zl allowed in current->mems_allowed?
+ * Are any of the nodes in the nodemask allowed in current->mems_allowed?
  */
-int cpuset_zonelist_valid_mems_allowed(struct zonelist *zl)
+int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
 {
-        int i;
-
-        for (i = 0; zl->zones[i]; i++) {
-                int nid = zone_to_nid(zl->zones[i]);
-
-                if (node_isset(nid, current->mems_allowed))
-                        return 1;
-        }
-        return 0;
+        return nodes_intersects(*nodemask, current->mems_allowed);
 }
 
 /*
diff --git a/kernel/exit.c b/kernel/exit.c
index 97f609f574b1..2a9d98c641ac 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -967,7 +967,7 @@ NORET_TYPE void do_exit(long code)
         proc_exit_connector(tsk);
         exit_notify(tsk, group_dead);
 #ifdef CONFIG_NUMA
-        mpol_free(tsk->mempolicy);
+        mpol_put(tsk->mempolicy);
         tsk->mempolicy = NULL;
 #endif
 #ifdef CONFIG_FUTEX
diff --git a/kernel/fork.c b/kernel/fork.c
index c674aa8d3c31..6067e429f281 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -279,7 +279,7 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
                 if (!tmp)
                         goto fail_nomem;
                 *tmp = *mpnt;
-                pol = mpol_copy(vma_policy(mpnt));
+                pol = mpol_dup(vma_policy(mpnt));
                 retval = PTR_ERR(pol);
                 if (IS_ERR(pol))
                         goto fail_nomem_policy;
@@ -1116,7 +1116,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         p->audit_context = NULL;
         cgroup_fork(p);
 #ifdef CONFIG_NUMA
-        p->mempolicy = mpol_copy(p->mempolicy);
+        p->mempolicy = mpol_dup(p->mempolicy);
         if (IS_ERR(p->mempolicy)) {
                 retval = PTR_ERR(p->mempolicy);
                 p->mempolicy = NULL;
@@ -1374,7 +1374,7 @@ bad_fork_cleanup_security:
         security_task_free(p);
 bad_fork_cleanup_policy:
 #ifdef CONFIG_NUMA
-        mpol_free(p->mempolicy);
+        mpol_put(p->mempolicy);
 bad_fork_cleanup_cgroup:
 #endif
         cgroup_exit(p, cgroup_callbacks_done);
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index f78777abe769..e379ef0e9c20 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1080,8 +1080,19 @@ static void run_hrtimer_pending(struct hrtimer_cpu_base *cpu_base)
                          * If the timer was rearmed on another CPU, reprogram
                          * the event device.
                          */
-                        if (timer->base->first == &timer->node)
-                                hrtimer_reprogram(timer, timer->base);
+                        struct hrtimer_clock_base *base = timer->base;
+
+                        if (base->first == &timer->node &&
+                            hrtimer_reprogram(timer, base)) {
+                                /*
+                                 * Timer is expired. Thus move it from tree to
+                                 * pending list again.
+                                 */
+                                __remove_hrtimer(timer, base,
+                                                 HRTIMER_STATE_PENDING, 0);
+                                list_add_tail(&timer->cb_entry,
+                                              &base->cpu_base->cb_pending);
+                        }
                 }
         }
         spin_unlock_irq(&cpu_base->lock);
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 6782dce93d01..cb85c79989b4 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1405,6 +1405,9 @@ static int __init crash_save_vmcoreinfo_init(void)
         VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
         VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
         VMCOREINFO_NUMBER(NR_FREE_PAGES);
+        VMCOREINFO_NUMBER(PG_lru);
+        VMCOREINFO_NUMBER(PG_private);
+        VMCOREINFO_NUMBER(PG_swapcache);
 
         arch_crash_save_vmcoreinfo();
 
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index fcfb580c3afc..1e0250cb9486 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -72,6 +72,18 @@ DEFINE_MUTEX(kprobe_mutex);		/* Protects kprobe_table */
 DEFINE_SPINLOCK(kretprobe_lock);        /* Protects kretprobe_inst_table */
 static DEFINE_PER_CPU(struct kprobe *, kprobe_instance) = NULL;
 
+/*
+ * Normally, functions that we'd want to prohibit kprobes in, are marked
+ * __kprobes. But, there are cases where such functions already belong to
+ * a different section (__sched for preempt_schedule)
+ *
+ * For such cases, we now have a blacklist
+ */
+struct kprobe_blackpoint kprobe_blacklist[] = {
+        {"preempt_schedule",},
+        {NULL}    /* Terminator */
+};
+
 #ifdef __ARCH_WANT_KPROBES_INSN_SLOT
 /*
  * kprobe->ainsn.insn points to the copy of the instruction to be
@@ -417,6 +429,21 @@ static inline void free_rp_inst(struct kretprobe *rp)
         }
 }
 
+static void __kprobes cleanup_rp_inst(struct kretprobe *rp)
+{
+        unsigned long flags;
+        struct kretprobe_instance *ri;
+        struct hlist_node *pos, *next;
+        /* No race here */
+        spin_lock_irqsave(&kretprobe_lock, flags);
+        hlist_for_each_entry_safe(ri, pos, next, &rp->used_instances, uflist) {
+                ri->rp = NULL;
+                hlist_del(&ri->uflist);
+        }
+        spin_unlock_irqrestore(&kretprobe_lock, flags);
+        free_rp_inst(rp);
+}
+
 /*
  * Keep all fields in the kprobe consistent
  */
@@ -492,9 +519,22 @@ static int __kprobes register_aggr_kprobe(struct kprobe *old_p,
 
 static int __kprobes in_kprobes_functions(unsigned long addr)
 {
+        struct kprobe_blackpoint *kb;
+
         if (addr >= (unsigned long)__kprobes_text_start &&
             addr < (unsigned long)__kprobes_text_end)
                 return -EINVAL;
+        /*
+         * If there exists a kprobe_blacklist, verify and
+         * fail any probe registration in the prohibited area
+         */
+        for (kb = kprobe_blacklist; kb->name != NULL; kb++) {
+                if (kb->start_addr) {
+                        if (addr >= kb->start_addr &&
+                            addr < (kb->start_addr + kb->range))
+                                return -EINVAL;
+                }
+        }
         return 0;
 }
 
@@ -555,6 +595,7 @@ static int __kprobes __register_kprobe(struct kprobe *p,
         }
 
         p->nmissed = 0;
+        INIT_LIST_HEAD(&p->list);
         mutex_lock(&kprobe_mutex);
         old_p = get_kprobe(p->addr);
         if (old_p) {
@@ -581,35 +622,28 @@ out:
         return ret;
 }
 
-int __kprobes register_kprobe(struct kprobe *p)
-{
-        return __register_kprobe(p, (unsigned long)__builtin_return_address(0));
-}
-
-void __kprobes unregister_kprobe(struct kprobe *p)
+/*
+ * Unregister a kprobe without a scheduler synchronization.
+ */
+static int __kprobes __unregister_kprobe_top(struct kprobe *p)
 {
-        struct module *mod;
         struct kprobe *old_p, *list_p;
-        int cleanup_p;
 
-        mutex_lock(&kprobe_mutex);
         old_p = get_kprobe(p->addr);
-        if (unlikely(!old_p)) {
-                mutex_unlock(&kprobe_mutex);
-                return;
-        }
+        if (unlikely(!old_p))
+                return -EINVAL;
+
         if (p != old_p) {
                 list_for_each_entry_rcu(list_p, &old_p->list, list)
                         if (list_p == p)
                         /* kprobe p is a valid probe */
                                 goto valid_p;
-                mutex_unlock(&kprobe_mutex);
-                return;
+                return -EINVAL;
         }
 valid_p:
         if (old_p == p ||
             (old_p->pre_handler == aggr_pre_handler &&
-             p->list.next == &old_p->list && p->list.prev == &old_p->list)) {
+             list_is_singular(&old_p->list))) {
                 /*
                  * Only probe on the hash list. Disarm only if kprobes are
                  * enabled - otherwise, the breakpoint would already have
@@ -618,43 +652,97 @@ valid_p:
                 if (kprobe_enabled)
                         arch_disarm_kprobe(p);
                 hlist_del_rcu(&old_p->hlist);
-                cleanup_p = 1;
         } else {
+                if (p->break_handler)
+                        old_p->break_handler = NULL;
+                if (p->post_handler) {
+                        list_for_each_entry_rcu(list_p, &old_p->list, list) {
+                                if ((list_p != p) && (list_p->post_handler))
+                                        goto noclean;
+                        }
+                        old_p->post_handler = NULL;
+                }
+noclean:
                 list_del_rcu(&p->list);
-                cleanup_p = 0;
         }
+        return 0;
+}
 
-        mutex_unlock(&kprobe_mutex);
+static void __kprobes __unregister_kprobe_bottom(struct kprobe *p)
+{
+        struct module *mod;
+        struct kprobe *old_p;
 
-        synchronize_sched();
         if (p->mod_refcounted) {
                 mod = module_text_address((unsigned long)p->addr);
                 if (mod)
                         module_put(mod);
         }
 
-        if (cleanup_p) {
-                if (p != old_p) {
-                        list_del_rcu(&p->list);
+        if (list_empty(&p->list) || list_is_singular(&p->list)) {
+                if (!list_empty(&p->list)) {
+                        /* "p" is the last child of an aggr_kprobe */
+                        old_p = list_entry(p->list.next, struct kprobe, list);
+                        list_del(&p->list);
                         kfree(old_p);
                 }
                 arch_remove_kprobe(p);
-        } else {
-                mutex_lock(&kprobe_mutex);
-                if (p->break_handler)
-                        old_p->break_handler = NULL;
-                if (p->post_handler){
-                        list_for_each_entry_rcu(list_p, &old_p->list, list){
-                                if (list_p->post_handler){
-                                        cleanup_p = 2;
-                                        break;
-                                }
-                        }
-                        if (cleanup_p == 0)
-                                old_p->post_handler = NULL;
+        }
+}
+
+static int __register_kprobes(struct kprobe **kps, int num,
+        unsigned long called_from)
+{
+        int i, ret = 0;
+
+        if (num <= 0)
+                return -EINVAL;
+        for (i = 0; i < num; i++) {
+                ret = __register_kprobe(kps[i], called_from);
+                if (ret < 0 && i > 0) {
+                        unregister_kprobes(kps, i);
+                        break;
                 }
-                mutex_unlock(&kprobe_mutex);
         }
+        return ret;
+}
+
+/*
+ * Registration and unregistration functions for kprobe.
+ */
+int __kprobes register_kprobe(struct kprobe *p)
+{
+        return __register_kprobes(&p, 1,
+                                  (unsigned long)__builtin_return_address(0));
+}
+
+void __kprobes unregister_kprobe(struct kprobe *p)
+{
+        unregister_kprobes(&p, 1);
+}
+
+int __kprobes register_kprobes(struct kprobe **kps, int num)
+{
+        return __register_kprobes(kps, num,
+                                  (unsigned long)__builtin_return_address(0));
+}
+
+void __kprobes unregister_kprobes(struct kprobe **kps, int num)
+{
+        int i;
+
+        if (num <= 0)
+                return;
+        mutex_lock(&kprobe_mutex);
+        for (i = 0; i < num; i++)
+                if (__unregister_kprobe_top(kps[i]) < 0)
+                        kps[i]->addr = NULL;
+        mutex_unlock(&kprobe_mutex);
+
+        synchronize_sched();
+        for (i = 0; i < num; i++)
+                if (kps[i]->addr)
+                        __unregister_kprobe_bottom(kps[i]);
 }
 
 static struct notifier_block kprobe_exceptions_nb = {
@@ -667,24 +755,69 @@ unsigned long __weak arch_deref_entry_point(void *entry)
         return (unsigned long)entry;
 }
 
-int __kprobes register_jprobe(struct jprobe *jp)
+static int __register_jprobes(struct jprobe **jps, int num,
+        unsigned long called_from)
 {
-        unsigned long addr = arch_deref_entry_point(jp->entry);
+        struct jprobe *jp;
+        int ret = 0, i;
 
-        if (!kernel_text_address(addr))
+        if (num <= 0)
                 return -EINVAL;
+        for (i = 0; i < num; i++) {
+                unsigned long addr;
+                jp = jps[i];
+                addr = arch_deref_entry_point(jp->entry);
+
+                if (!kernel_text_address(addr))
+                        ret = -EINVAL;
+                else {
+                        /* Todo: Verify probepoint is a function entry point */
+                        jp->kp.pre_handler = setjmp_pre_handler;
+                        jp->kp.break_handler = longjmp_break_handler;
+                        ret = __register_kprobe(&jp->kp, called_from);
+                }
+                if (ret < 0 && i > 0) {
+                        unregister_jprobes(jps, i);
+                        break;
+                }
+        }
+        return ret;
+}
 
-        /* Todo: Verify probepoint is a function entry point */
-        jp->kp.pre_handler = setjmp_pre_handler;
-        jp->kp.break_handler = longjmp_break_handler;
-
-        return __register_kprobe(&jp->kp,
+int __kprobes register_jprobe(struct jprobe *jp)
+{
+        return __register_jprobes(&jp, 1,
                 (unsigned long)__builtin_return_address(0));
 }
 
 void __kprobes unregister_jprobe(struct jprobe *jp)
 {
-        unregister_kprobe(&jp->kp);
+        unregister_jprobes(&jp, 1);
+}
+
+int __kprobes register_jprobes(struct jprobe **jps, int num)
+{
+        return __register_jprobes(jps, num,
+                (unsigned long)__builtin_return_address(0));
+}
+
+void __kprobes unregister_jprobes(struct jprobe **jps, int num)
+{
+        int i;
+
+        if (num <= 0)
+                return;
+        mutex_lock(&kprobe_mutex);
+        for (i = 0; i < num; i++)
+                if (__unregister_kprobe_top(&jps[i]->kp) < 0)
+                        jps[i]->kp.addr = NULL;
+        mutex_unlock(&kprobe_mutex);
+
+        synchronize_sched();
+        for (i = 0; i < num; i++) {
+                if (jps[i]->kp.addr)
+                        __unregister_kprobe_bottom(&jps[i]->kp);
+        }
 }
 
 #ifdef CONFIG_KRETPROBES
@@ -725,7 +858,8 @@ static int __kprobes pre_handler_kretprobe(struct kprobe *p,
         return 0;
 }
 
-int __kprobes register_kretprobe(struct kretprobe *rp)
+static int __kprobes __register_kretprobe(struct kretprobe *rp,
+                                          unsigned long called_from)
 {
         int ret = 0;
         struct kretprobe_instance *inst;
@@ -771,46 +905,101 @@ int __kprobes register_kretprobe(struct kretprobe *rp)
 
         rp->nmissed = 0;
         /* Establish function entry probe point */
-        if ((ret = __register_kprobe(&rp->kp,
-                (unsigned long)__builtin_return_address(0))) != 0)
+        ret = __register_kprobe(&rp->kp, called_from);
+        if (ret != 0)
                 free_rp_inst(rp);
         return ret;
 }
 
+static int __register_kretprobes(struct kretprobe **rps, int num,
+        unsigned long called_from)
+{
+        int ret = 0, i;
+
+        if (num <= 0)
+                return -EINVAL;
+        for (i = 0; i < num; i++) {
+                ret = __register_kretprobe(rps[i], called_from);
+                if (ret < 0 && i > 0) {
+                        unregister_kretprobes(rps, i);
+                        break;
+                }
+        }
+        return ret;
+}
+
+int __kprobes register_kretprobe(struct kretprobe *rp)
+{
+        return __register_kretprobes(&rp, 1,
+                        (unsigned long)__builtin_return_address(0));
+}
+
+void __kprobes unregister_kretprobe(struct kretprobe *rp)
+{
+        unregister_kretprobes(&rp, 1);
+}
+
+int __kprobes register_kretprobes(struct kretprobe **rps, int num)
+{
+        return __register_kretprobes(rps, num,
+                        (unsigned long)__builtin_return_address(0));
+}
+
+void __kprobes unregister_kretprobes(struct kretprobe **rps, int num)
+{
+        int i;
+
+        if (num <= 0)
+                return;
+        mutex_lock(&kprobe_mutex);
+        for (i = 0; i < num; i++)
+                if (__unregister_kprobe_top(&rps[i]->kp) < 0)
+                        rps[i]->kp.addr = NULL;
+        mutex_unlock(&kprobe_mutex);
+
+        synchronize_sched();
+        for (i = 0; i < num; i++) {
+                if (rps[i]->kp.addr) {
+                        __unregister_kprobe_bottom(&rps[i]->kp);
+                        cleanup_rp_inst(rps[i]);
+                }
+        }
+}
+
 #else /* CONFIG_KRETPROBES */
 int __kprobes register_kretprobe(struct kretprobe *rp)
 {
         return -ENOSYS;
 }
 
-static int __kprobes pre_handler_kretprobe(struct kprobe *p,
-                                           struct pt_regs *regs)
+int __kprobes register_kretprobes(struct kretprobe **rps, int num)
 {
-        return 0;
+        return -ENOSYS;
 }
-#endif /* CONFIG_KRETPROBES */
-
 void __kprobes unregister_kretprobe(struct kretprobe *rp)
 {
-        unsigned long flags;
-        struct kretprobe_instance *ri;
-        struct hlist_node *pos, *next;
+}
 
-        unregister_kprobe(&rp->kp);
+void __kprobes unregister_kretprobes(struct kretprobe **rps, int num)
+{
+}
 
-        /* No race here */
-        spin_lock_irqsave(&kretprobe_lock, flags);
-        hlist_for_each_entry_safe(ri, pos, next, &rp->used_instances, uflist) {
-                ri->rp = NULL;
-                hlist_del(&ri->uflist);
-        }
-        spin_unlock_irqrestore(&kretprobe_lock, flags);
-        free_rp_inst(rp);
+static int __kprobes pre_handler_kretprobe(struct kprobe *p,
+                                           struct pt_regs *regs)
+{
+        return 0;
 }
 
+#endif /* CONFIG_KRETPROBES */
+
 static int __init init_kprobes(void)
 {
         int i, err = 0;
+        unsigned long offset = 0, size = 0;
+        char *modname, namebuf[128];
+        const char *symbol_name;
+        void *addr;
+        struct kprobe_blackpoint *kb;
 
         /* FIXME allocate the probe table, currently defined statically */
         /* initialize all list heads */
@@ -819,6 +1008,28 @@ static int __init init_kprobes(void)
                 INIT_HLIST_HEAD(&kretprobe_inst_table[i]);
         }
 
+        /*
+         * Lookup and populate the kprobe_blacklist.
+         *
+         * Unlike the kretprobe blacklist, we'll need to determine
+         * the range of addresses that belong to the said functions,
+         * since a kprobe need not necessarily be at the beginning
+         * of a function.
+         */
+        for (kb = kprobe_blacklist; kb->name != NULL; kb++) {
+                kprobe_lookup_name(kb->name, addr);
+                if (!addr)
+                        continue;
+
+                kb->start_addr = (unsigned long)addr;
+                symbol_name = kallsyms_lookup(kb->start_addr,
+                                &size, &offset, &modname, namebuf);
+                if (!symbol_name)
+                        kb->range = 0;
+                else
+                        kb->range = size;
+        }
+
         if (kretprobe_blacklist_size) {
                 /* lookup the function address from its name */
                 for (i = 0; kretprobe_blacklist[i].name != NULL; i++) {
@@ -1066,8 +1277,12 @@ module_init(init_kprobes);
 
 EXPORT_SYMBOL_GPL(register_kprobe);
 EXPORT_SYMBOL_GPL(unregister_kprobe);
+EXPORT_SYMBOL_GPL(register_kprobes);
+EXPORT_SYMBOL_GPL(unregister_kprobes);
 EXPORT_SYMBOL_GPL(register_jprobe);
 EXPORT_SYMBOL_GPL(unregister_jprobe);
+EXPORT_SYMBOL_GPL(register_jprobes);
+EXPORT_SYMBOL_GPL(unregister_jprobes);
 #ifdef CONFIG_KPROBES
 EXPORT_SYMBOL_GPL(jprobe_return);
 #endif
@@ -1075,4 +1290,6 @@ EXPORT_SYMBOL_GPL(jprobe_return);
 #ifdef CONFIG_KPROBES
 EXPORT_SYMBOL_GPL(register_kretprobe);
 EXPORT_SYMBOL_GPL(unregister_kretprobe);
+EXPORT_SYMBOL_GPL(register_kretprobes);
+EXPORT_SYMBOL_GPL(unregister_kretprobes);
 #endif
diff --git a/kernel/power/console.c b/kernel/power/console.c
index 89bcf4973ee5..b8628be2a465 100644
--- a/kernel/power/console.c
+++ b/kernel/power/console.c
@@ -7,17 +7,39 @@
 #include <linux/vt_kern.h>
 #include <linux/kbd_kern.h>
 #include <linux/console.h>
+#include <linux/module.h>
 #include "power.h"
 
 #if defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE)
 #define SUSPEND_CONSOLE (MAX_NR_CONSOLES-1)
 
 static int orig_fgconsole, orig_kmsg;
+static int disable_vt_switch;
+
+/*
+ * Normally during a suspend, we allocate a new console and switch to it.
+ * When we resume, we switch back to the original console.  This switch
+ * can be slow, so on systems where the framebuffer can handle restoration
+ * of video registers anyways, there's little point in doing the console
+ * switch.  This function allows you to disable it by passing it '0'.
+ */
+void pm_set_vt_switch(int do_switch)
+{
+        acquire_console_sem();
+        disable_vt_switch = !do_switch;
+        release_console_sem();
+}
+EXPORT_SYMBOL(pm_set_vt_switch);
 
 int pm_prepare_console(void)
 {
         acquire_console_sem();
 
+        if (disable_vt_switch) {
+                release_console_sem();
+                return 0;
+        }
+
         orig_fgconsole = fg_console;
 
         if (vc_allocate(SUSPEND_CONSOLE)) {
@@ -50,9 +72,12 @@ int pm_prepare_console(void)
 void pm_restore_console(void)
 {
         acquire_console_sem();
+        if (disable_vt_switch) {
+                release_console_sem();
+                return;
+        }
         set_console(orig_fgconsole);
         release_console_sem();
         kmsg_redirect = orig_kmsg;
-        return;
 }
 #endif
diff --git a/kernel/sys.c b/kernel/sys.c
index 6a0cc71ee88d..f2a451366953 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1632,10 +1632,9 @@ asmlinkage long sys_umask(int mask)
 asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
                           unsigned long arg4, unsigned long arg5)
 {
-        long error;
+        long uninitialized_var(error);
 
-        error = security_task_prctl(option, arg2, arg3, arg4, arg5);
-        if (error)
+        if (security_task_prctl(option, arg2, arg3, arg4, arg5, &error))
                 return error;
 
         switch (option) {
@@ -1688,17 +1687,6 @@ asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
                                 error = -EINVAL;
                         break;
 
-                case PR_GET_KEEPCAPS:
-                        if (current->keep_capabilities)
-                                error = 1;
-                        break;
-                case PR_SET_KEEPCAPS:
-                        if (arg2 != 0 && arg2 != 1) {
-                                error = -EINVAL;
-                                break;
-                        }
-                        current->keep_capabilities = arg2;
-                        break;
                 case PR_SET_NAME: {
                         struct task_struct *me = current;
                         unsigned char ncomm[sizeof(me->comm)];
@@ -1732,17 +1720,6 @@ asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
                 case PR_SET_SECCOMP:
                         error = prctl_set_seccomp(arg2);
                         break;
-
-                case PR_CAPBSET_READ:
-                        if (!cap_valid(arg2))
-                                return -EINVAL;
-                        return !!cap_raised(current->cap_bset, arg2);
-                case PR_CAPBSET_DROP:
-#ifdef CONFIG_SECURITY_FILE_CAPABILITIES
-                        return cap_prctl_drop(arg2);
-#else
-                        return -EINVAL;
-#endif
                 case PR_GET_TSC:
                         error = GET_TSC_CTL(arg2);
                         break;