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authorZoltan Menyhart <Zoltan.Menyhart@bull.net>2006-01-13 11:25:23 -0500
committerTony Luck <tony.luck@intel.com>2006-01-17 17:04:00 -0500
commit4b16bfbf8f8013fefb49592d030ff87651ab48cb (patch)
treece9150f8ceac6150261f5bc69afdf9d2e95def19 /include/asm-ia64/semaphore.h
parent8d08aed8d7714683b33666cc066e20f957dda01d (diff)
[IA64] Fix bug in ia64 specific down() function
Chen, Kenneth W wrote: > The memory order semantics for include/asm-ia64/semaphore.h:down() > doesn't look right. It is using atomic_dec_return, which eventually > translate into ia64_fetch_and_add() that uses release semantics. > Shouldn't it use acquire semantics? Use ia64_fetchadd() instead of atomic_dec_return() Acked-by: Ken Chen <kenneth.w.chen@intel.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'include/asm-ia64/semaphore.h')
-rw-r--r--include/asm-ia64/semaphore.h8
1 files changed, 4 insertions, 4 deletions
diff --git a/include/asm-ia64/semaphore.h b/include/asm-ia64/semaphore.h
index bb8906285fab..f483eeb95dd1 100644
--- a/include/asm-ia64/semaphore.h
+++ b/include/asm-ia64/semaphore.h
@@ -61,7 +61,7 @@ static inline void
61down (struct semaphore *sem) 61down (struct semaphore *sem)
62{ 62{
63 might_sleep(); 63 might_sleep();
64 if (atomic_dec_return(&sem->count) < 0) 64 if (ia64_fetchadd(-1, &sem->count.counter, acq) < 1)
65 __down(sem); 65 __down(sem);
66} 66}
67 67
@@ -75,7 +75,7 @@ down_interruptible (struct semaphore * sem)
75 int ret = 0; 75 int ret = 0;
76 76
77 might_sleep(); 77 might_sleep();
78 if (atomic_dec_return(&sem->count) < 0) 78 if (ia64_fetchadd(-1, &sem->count.counter, acq) < 1)
79 ret = __down_interruptible(sem); 79 ret = __down_interruptible(sem);
80 return ret; 80 return ret;
81} 81}
@@ -85,7 +85,7 @@ down_trylock (struct semaphore *sem)
85{ 85{
86 int ret = 0; 86 int ret = 0;
87 87
88 if (atomic_dec_return(&sem->count) < 0) 88 if (ia64_fetchadd(-1, &sem->count.counter, acq) < 1)
89 ret = __down_trylock(sem); 89 ret = __down_trylock(sem);
90 return ret; 90 return ret;
91} 91}
@@ -93,7 +93,7 @@ down_trylock (struct semaphore *sem)
93static inline void 93static inline void
94up (struct semaphore * sem) 94up (struct semaphore * sem)
95{ 95{
96 if (atomic_inc_return(&sem->count) <= 0) 96 if (ia64_fetchadd(1, &sem->count.counter, rel) <= -1)
97 __up(sem); 97 __up(sem);
98} 98}
99 99