Merge 'Linux v3.0' into Litmus

Some notes:
* Litmus^RT scheduling class is the topmost scheduling class
  (above stop_sched_class).
* scheduler_ipi() function (e.g., in smp_reschedule_interrupt())
  may increase IPI latencies.
* Added path into schedule() to quickly re-evaluate scheduling
  decision without becoming preemptive again. This used to be
  a standard path before the removal of BKL.

Conflicts:
	Makefile
	arch/arm/kernel/calls.S
	arch/arm/kernel/smp.c
	arch/x86/include/asm/unistd_32.h
	arch/x86/kernel/smp.c
	arch/x86/kernel/syscall_table_32.S
	include/linux/hrtimer.h
	kernel/printk.c
	kernel/sched.c
	kernel/sched_fair.c

1 files changed, 10 insertions, 3 deletions

diff --git a/kernel/power/user.c b/kernel/power/user.c
index e819e17877ca..42ddbc6f0de6 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -113,8 +113,10 @@ static int snapshot_open(struct inode *inode, struct file *filp)
                 if (error)
                         pm_notifier_call_chain(PM_POST_RESTORE);
         }
-        if (error)
+        if (error) {
+                free_basic_memory_bitmaps();
                 atomic_inc(&snapshot_device_available);
+        }
         data->frozen = 0;
         data->ready = 0;
         data->platform_support = 0;
@@ -135,9 +137,11 @@ static int snapshot_release(struct inode *inode, struct file *filp)
         free_basic_memory_bitmaps();
         data = filp->private_data;
         free_all_swap_pages(data->swap);
-        if (data->frozen)
+        if (data->frozen) {
+                pm_restore_gfp_mask();
                 thaw_processes();
-        pm_notifier_call_chain(data->mode == O_WRONLY ?
+        }
+        pm_notifier_call_chain(data->mode == O_RDONLY ?
                         PM_POST_HIBERNATION : PM_POST_RESTORE);
         atomic_inc(&snapshot_device_available);
 
@@ -263,6 +267,7 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
         case SNAPSHOT_UNFREEZE:
                 if (!data->frozen || data->ready)
                         break;
+                pm_restore_gfp_mask();
                 thaw_processes();
                 usermodehelper_enable();
                 data->frozen = 0;
@@ -275,6 +280,7 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
                         error = -EPERM;
                         break;
                 }
+                pm_restore_gfp_mask();
                 error = hibernation_snapshot(data->platform_support);
                 if (!error)
                         error = put_user(in_suspend, (int __user *)arg);
@@ -377,6 +383,7 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
                  * PM_HIBERNATION_PREPARE
                  */
                 error = suspend_devices_and_enter(PM_SUSPEND_MEM);
+                data->ready = 0;
                 break;
 
         case SNAPSHOT_PLATFORM_SUPPORT: