diff options
Diffstat (limited to 'arch/x86/include/asm/io_64.h')
| -rw-r--r-- | arch/x86/include/asm/io_64.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/x86/include/asm/io_64.h b/arch/x86/include/asm/io_64.h index 1305525813f..6964a1c366d 100644 --- a/arch/x86/include/asm/io_64.h +++ b/arch/x86/include/asm/io_64.h @@ -83,7 +83,13 @@ memcpy_toio(volatile void __iomem *dst, const void *src, size_t count) * 1. Out of order aware processors * 2. Accidentally out of order processors (PPro errata #51) */ -#define flush_write_buffers() do { } while (0) + +static inline void flush_write_buffers(void) +{ +#if defined(CONFIG_X86_OOSTORE) || defined(CONFIG_X86_PPRO_FENCE) + asm volatile("lock; addl $0,0(%%esp)": : :"memory"); +#endif +} #endif /* __KERNEL__ */ |