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[PATCH] ARM SMP: __xchg support

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This enables the existing __xchg implementation to be used on SMP.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2005-06-28 19:22:25 +01:00 committed by Russell King
parent 4b0ef3b112
commit 053a7b5b76
1 changed files with 9 additions and 3 deletions
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12
include/asm-arm/system.h
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@ -290,7 +290,6 @@ do { \
}) })
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
#error SMP not supported
#define smp_mb() mb() #define smp_mb() mb()
#define smp_rmb() rmb() #define smp_rmb() rmb()
@ -304,6 +303,8 @@ do { \
#define smp_wmb() barrier() #define smp_wmb() barrier()
#define smp_read_barrier_depends() do { } while(0) #define smp_read_barrier_depends() do { } while(0)
#endif /* CONFIG_SMP */
#if defined(CONFIG_CPU_SA1100) || defined(CONFIG_CPU_SA110) #if defined(CONFIG_CPU_SA1100) || defined(CONFIG_CPU_SA110)
/* /*
* On the StrongARM, "swp" is terminally broken since it bypasses the * On the StrongARM, "swp" is terminally broken since it bypasses the
@ -316,9 +317,16 @@ do { \
* *
* We choose (1) since its the "easiest" to achieve here and is not * We choose (1) since its the "easiest" to achieve here and is not
* dependent on the processor type. * dependent on the processor type.
*
* NOTE that this solution won't work on an SMP system, so explcitly
* forbid it here.
*/ */
#ifdef CONFIG_SMP
#error SMP is not supported on SA1100/SA110
#else
#define swp_is_buggy #define swp_is_buggy
#endif #endif
#endif
static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size) static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
{ {
@ -361,8 +369,6 @@ static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size
return ret; return ret;
} }
#endif /* CONFIG_SMP */
#endif /* __ASSEMBLY__ */ #endif /* __ASSEMBLY__ */
#define arch_align_stack(x) (x) #define arch_align_stack(x) (x)