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fix regression disabling use of pause instruction for x86 a_spin

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commits e24984efd5c6ac5ea8e6cb6cd914fa8435d458bc and
16b55298dc4b6a54d287d7494e04542667ef8861 inadvertently disabled the
a_spin implementations for i386, x86_64, and x32 by defining a macro
named a_pause instead of a_spin. this should not have caused any
functional regression, but it inhibited cpu relaxation while spinning
for locks.

bug reported by George Kulakowski.
This commit is contained in:
Rich Felker 2016-03-29 21:22:52 -04:00
parent 6d1a3dfeaf
commit 5c3412d225
3 changed files with 3 additions and 3 deletions
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2
arch/i386/atomic_arch.h
View File

@ -71,7 +71,7 @@ static inline void a_barrier()
__asm__ __volatile__( "" : : : "memory" );
}
#define a_pause a_pause
#define a_spin a_spin
static inline void a_spin()
{
__asm__ __volatile__( "pause" : : : "memory" );

2
arch/x32/atomic_arch.h
View File

@ -87,7 +87,7 @@ static inline void a_barrier()
__asm__ __volatile__( "" : : : "memory" );
}
#define a_pause a_pause
#define a_spin a_spin
static inline void a_spin()
{
__asm__ __volatile__( "pause" : : : "memory" );

2
arch/x86_64/atomic_arch.h
View File

@ -96,7 +96,7 @@ static inline void a_barrier()
__asm__ __volatile__( "" : : : "memory" );
}
#define a_pause a_pause
#define a_spin a_spin
static inline void a_spin()
{
__asm__ __volatile__( "pause" : : : "memory" );