From: Ingo Molnar <[email protected]>
Loop nicer in the mark_rt_mutex_waiters() busy loop.
Fix white space damage while at it.
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Index: linux-2.6.22-rc4/kernel/rtmutex_common.h
===================================================================
--- linux-2.6.22-rc4.orig/kernel/rtmutex_common.h 2007-06-08 01:48:02.000000000 +0200
+++ linux-2.6.22-rc4/kernel/rtmutex_common.h 2007-06-08 16:25:55.000000000 +0200
@@ -103,7 +103,7 @@ static inline struct task_struct *rt_mut
static inline struct task_struct *rt_mutex_real_owner(struct rt_mutex *lock)
{
- return (struct task_struct *)
+ return (struct task_struct *)
((unsigned long)lock->owner & ~RT_MUTEX_HAS_WAITERS);
}
@@ -120,11 +120,13 @@ static inline unsigned long rt_mutex_own
# define rt_mutex_cmpxchg(l,c,n) (cmpxchg(&l->owner, c, n) == c)
static inline void mark_rt_mutex_waiters(struct rt_mutex *lock)
{
- unsigned long owner, *p = (unsigned long *) &lock->owner;
+ unsigned long *p = (unsigned long *) &lock->owner;
+ unsigned long owner = *p;
- do {
+ while (cmpxchg(p, owner, owner | RT_MUTEX_HAS_WAITERS) != owner) {
+ cpu_relax();
owner = *p;
- } while (cmpxchg(p, owner, owner | RT_MUTEX_HAS_WAITERS) != owner);
+ }
}
#else
# define rt_mutex_cmpxchg(l,c,n) (0)
-
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