Messages in this thread Patch in this message | | | Subject | [patch] lock debugging: loop nicer in mark_rt_mutex_waiters | From | Thomas Gleixner <> | Date | Fri, 08 Jun 2007 16:33:14 +0200 |
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From: Ingo Molnar <mingo@elte.hu>
Loop nicer in the mark_rt_mutex_waiters() busy loop.
Fix white space damage while at it.
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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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