Merge branch 'mpi-master' into wip-k-fmlpwip-k-fmlp

Conflicts:
	litmus/sched_cedf.c

1 files changed, 8 insertions, 4 deletions

diff --git a/include/linux/bit_spinlock.h b/include/linux/bit_spinlock.h
index 7113a32a86ea..b4326bfa684f 100644
--- a/include/linux/bit_spinlock.h
+++ b/include/linux/bit_spinlock.h
@@ -1,6 +1,10 @@
 #ifndef __LINUX_BIT_SPINLOCK_H
 #define __LINUX_BIT_SPINLOCK_H
 
+#include <linux/kernel.h>
+#include <linux/preempt.h>
+#include <asm/atomic.h>
+
 /*
  *  bit-based spin_lock()
  *
@@ -19,11 +23,11 @@ static inline void bit_spin_lock(int bitnum, unsigned long *addr)
         preempt_disable();
 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
         while (unlikely(test_and_set_bit_lock(bitnum, addr))) {
-                while (test_bit(bitnum, addr)) {
-                        preempt_enable();
+                preempt_enable();
+                do {
                         cpu_relax();
-                        preempt_disable();
-                }
+                } while (test_bit(bitnum, addr));
+                preempt_disable();
         }
 #endif
         __acquire(bitlock);