From: Alexander Duyck <alexander.h.duyck@intel.com>
Date: Thu, 1 Jul 2010 13:28:27 +0000 (+0000)
Subject: x86: Drop CONFIG_MCORE2 check around setting of NET_IP_ALIGN
X-Git-Tag: v2.6.36-rc1~571^2~381
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7475271004b66e9c22e1bb28f240a38c5d6fe76e;p=platform%2Fkernel%2Flinux-3.10.git

x86: Drop CONFIG_MCORE2 check around setting of NET_IP_ALIGN

This patch removes the CONFIG_MCORE2 check from around NET_IP_ALIGN.  It is
based on a suggestion from Andi Kleen.  The assumption is that there are
not any x86 cores where unaligned access is really slow, and this change
would allow for a performance improvement to still exist on configurations
that are not necessarily optimized for Core 2.

Cc: Andi Kleen <ak@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/arch/x86/include/asm/system.h b/arch/x86/include/asm/system.h
index b4293fc..1db9bd2 100644
--- a/arch/x86/include/asm/system.h
+++ b/arch/x86/include/asm/system.h
@@ -457,7 +457,6 @@ static inline void rdtsc_barrier(void)
 	alternative(ASM_NOP3, "lfence", X86_FEATURE_LFENCE_RDTSC);
 }
 
-#ifdef CONFIG_MCORE2
 /*
  * We handle most unaligned accesses in hardware.  On the other hand
  * unaligned DMA can be quite expensive on some Nehalem processors.
@@ -465,5 +464,4 @@ static inline void rdtsc_barrier(void)
  * Based on this we disable the IP header alignment in network drivers.
  */
 #define NET_IP_ALIGN	0
-#endif
 #endif /* _ASM_X86_SYSTEM_H */