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| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2005-06-28 19:22:25 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2005-06-28 19:22:25 +0100 |
| commit | 053a7b5b7617a72d7c61b6f84196d1c0f79b9849 (patch) | |
| tree | 53859118b6a815278987a5c679575f1b4b37a1c7 /include/asm-arm/system.h | |
| parent | 4b0ef3b1127776d4a2787d7530ac0c4da82c2331 (diff) | |
| download | lwn-053a7b5b7617a72d7c61b6f84196d1c0f79b9849.tar.gz lwn-053a7b5b7617a72d7c61b6f84196d1c0f79b9849.zip | |
[PATCH] ARM SMP: __xchg support
This enables the existing __xchg implementation to be used on SMP.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'include/asm-arm/system.h')
| -rw-r--r-- | include/asm-arm/system.h | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/include/asm-arm/system.h b/include/asm-arm/system.h index 3d0d2860b6db..cdf49f442fd2 100644 --- a/include/asm-arm/system.h +++ b/include/asm-arm/system.h @@ -290,7 +290,6 @@ do { \ }) #ifdef CONFIG_SMP -#error SMP not supported #define smp_mb() mb() #define smp_rmb() rmb() @@ -304,6 +303,8 @@ do { \ #define smp_wmb() barrier() #define smp_read_barrier_depends() do { } while(0) +#endif /* CONFIG_SMP */ + #if defined(CONFIG_CPU_SA1100) || defined(CONFIG_CPU_SA110) /* * 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 * 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 #endif +#endif 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; } -#endif /* CONFIG_SMP */ - #endif /* __ASSEMBLY__ */ #define arch_align_stack(x) (x) |