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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6
[deliverable/linux.git]
/
arch
/
x86
/
include
/
asm
/
system.h
diff --git
a/arch/x86/include/asm/system.h
b/arch/x86/include/asm/system.h
index e7f4d33c55edbb80b8ec52d9793a45d3c8854519..33ecc3ea8782add8f88e68405d227ee4af700134 100644
(file)
--- 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);
}
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 */
#endif /* _ASM_X86_SYSTEM_H */
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