X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=arch%2Fx86%2Finclude%2Fasm%2Fsystem.h;h=33ecc3ea8782add8f88e68405d227ee4af700134;hb=6ba74014c1ab0e37af7de6f64b4eccbbae3cb9e7;hp=e7f4d33c55edbb80b8ec52d9793a45d3c8854519;hpb=293ffa8faa21bbc5e77d3f779d95c4146ee8f709;p=deliverable%2Flinux.git

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 */