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, 4 insertions, 30 deletions

diff --git a/kernel/rtmutex-tester.c b/kernel/rtmutex-tester.c
index a56f629b057a..5c9ccd380966 100644
--- a/kernel/rtmutex-tester.c
+++ b/kernel/rtmutex-tester.c
@@ -9,7 +9,6 @@
 #include <linux/kthread.h>
 #include <linux/module.h>
 #include <linux/sched.h>
-#include <linux/smp_lock.h>
 #include <linux/spinlock.h>
 #include <linux/sysdev.h>
 #include <linux/timer.h>
@@ -27,7 +26,6 @@ struct test_thread_data {
         int                     opcode;
         int                     opdata;
         int                     mutexes[MAX_RT_TEST_MUTEXES];
-        int                     bkl;
         int                     event;
         struct sys_device       sysdev;
 };
@@ -46,9 +44,8 @@ enum test_opcodes {
         RTTEST_LOCKINTNOWAIT,   /* 6 Lock interruptible no wait in wakeup, data = lockindex */
         RTTEST_LOCKCONT,        /* 7 Continue locking after the wakeup delay */
         RTTEST_UNLOCK,          /* 8 Unlock, data = lockindex */
-        RTTEST_LOCKBKL,         /* 9 Lock BKL */
-        RTTEST_UNLOCKBKL,       /* 10 Unlock BKL */
-        RTTEST_SIGNAL,          /* 11 Signal other test thread, data = thread id */
+        /* 9, 10 - reserved for BKL commemoration */
+        RTTEST_SIGNAL = 11,     /* 11 Signal other test thread, data = thread id */
         RTTEST_RESETEVENT = 98, /* 98 Reset event counter */
         RTTEST_RESET = 99,      /* 99 Reset all pending operations */
 };
@@ -74,11 +71,6 @@ static int handle_op(struct test_thread_data *td, int lockwakeup)
                                 td->mutexes[i] = 0;
                         }
                 }
-
-                if (!lockwakeup && td->bkl == 4) {
-                        unlock_kernel();
-                        td->bkl = 0;
-                }
                 return 0;
 
         case RTTEST_RESETEVENT:
@@ -129,21 +121,6 @@ static int handle_op(struct test_thread_data *td, int lockwakeup)
                 td->mutexes[id] = 0;
                 return 0;
 
-        case RTTEST_LOCKBKL:
-                if (td->bkl)
-                        return 0;
-                td->bkl = 1;
-                lock_kernel();
-                td->bkl = 4;
-                return 0;
-
-        case RTTEST_UNLOCKBKL:
-                if (td->bkl != 4)
-                        break;
-                unlock_kernel();
-                td->bkl = 0;
-                return 0;
-
         default:
                 break;
         }
@@ -190,7 +167,6 @@ void schedule_rt_mutex_test(struct rt_mutex *mutex)
                 td->event = atomic_add_return(1, &rttest_event);
                 break;
 
-        case RTTEST_LOCKBKL:
         default:
                 break;
         }
@@ -223,8 +199,6 @@ void schedule_rt_mutex_test(struct rt_mutex *mutex)
                 td->event = atomic_add_return(1, &rttest_event);
                 return;
 
-        case RTTEST_LOCKBKL:
-                return;
         default:
                 return;
         }
@@ -374,11 +348,11 @@ static ssize_t sysfs_test_status(struct sys_device *dev, struct sysdev_attribute
         spin_lock(&rttest_lock);
 
         curr += sprintf(curr,
-                "O: %4d, E:%8d, S: 0x%08lx, P: %4d, N: %4d, B: %p, K: %d, M:",
+                "O: %4d, E:%8d, S: 0x%08lx, P: %4d, N: %4d, B: %p, M:",
                 td->opcode, td->event, tsk->state,
                         (MAX_RT_PRIO - 1) - tsk->prio,
                         (MAX_RT_PRIO - 1) - tsk->normal_prio,
-                tsk->pi_blocked_on, td->bkl);
+                tsk->pi_blocked_on);
 
         for (i = MAX_RT_TEST_MUTEXES - 1; i >=0 ; i--)
                 curr += sprintf(curr, "%d", td->mutexes[i]);