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-rw-r--r--include/asm-powerpc/spinlock.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/include/asm-powerpc/spinlock.h b/include/asm-powerpc/spinlock.h
index 895cb6d..c31e438 100644
--- a/include/asm-powerpc/spinlock.h
+++ b/include/asm-powerpc/spinlock.h
@@ -36,6 +36,19 @@
#define LOCK_TOKEN 1
#endif
+#if defined(CONFIG_PPC64) && defined(CONFIG_SMP)
+#define CLEAR_IO_SYNC (get_paca()->io_sync = 0)
+#define SYNC_IO do { \
+ if (unlikely(get_paca()->io_sync)) { \
+ mb(); \
+ get_paca()->io_sync = 0; \
+ } \
+ } while (0)
+#else
+#define CLEAR_IO_SYNC
+#define SYNC_IO
+#endif
+
/*
* This returns the old value in the lock, so we succeeded
* in getting the lock if the return value is 0.
@@ -61,6 +74,7 @@ static __inline__ unsigned long __spin_trylock(raw_spinlock_t *lock)
static int __inline__ __raw_spin_trylock(raw_spinlock_t *lock)
{
+ CLEAR_IO_SYNC;
return __spin_trylock(lock) == 0;
}
@@ -91,6 +105,7 @@ extern void __rw_yield(raw_rwlock_t *lock);
static void __inline__ __raw_spin_lock(raw_spinlock_t *lock)
{
+ CLEAR_IO_SYNC;
while (1) {
if (likely(__spin_trylock(lock) == 0))
break;
@@ -107,6 +122,7 @@ static void __inline__ __raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long
{
unsigned long flags_dis;
+ CLEAR_IO_SYNC;
while (1) {
if (likely(__spin_trylock(lock) == 0))
break;
@@ -124,6 +140,7 @@ static void __inline__ __raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long
static __inline__ void __raw_spin_unlock(raw_spinlock_t *lock)
{
+ SYNC_IO;
__asm__ __volatile__("# __raw_spin_unlock\n\t"
LWSYNC_ON_SMP: : :"memory");
lock->slock = 0;
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