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| author | Ingo Molnar <mingo@elte.hu> | 2010-08-12 21:38:56 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-08-12 21:39:04 +0200 |
| commit | f46a6804135795f77d096ab0128f27531c7d051c (patch) | |
| tree | 7cd33f69e3661327739ae4c96e5a8389e7fc912e /arch/x86/include/asm/system.h | |
| parent | b3e84ffa21f916e3354a12a7f19169c9febe96d0 (diff) | |
| parent | ad41a1e0cab07c5125456e8d38e5b1ab148d04aa (diff) | |
Merge branch 'linus' into perf/urgent
Merge reason: Fix upstream breakage introduced by:
de5d9bf: Move list types from <linux/list.h> to <linux/types.h>.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/include/asm/system.h')
| -rw-r--r-- | arch/x86/include/asm/system.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/include/asm/system.h b/arch/x86/include/asm/system.h index e7f4d33c55ed..33ecc3ea8782 100644 --- a/arch/x86/include/asm/system.h +++ b/arch/x86/include/asm/system.h @@ -457,4 +457,11 @@ static __always_inline void rdtsc_barrier(void) alternative(ASM_NOP3, "lfence", X86_FEATURE_LFENCE_RDTSC); } +/* + * We handle most unaligned accesses in hardware. On the other hand + * unaligned DMA can be quite expensive on some Nehalem processors. + * + * Based on this we disable the IP header alignment in network drivers. + */ +#define NET_IP_ALIGN 0 #endif /* _ASM_X86_SYSTEM_H */ |