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From: Andi Kleen <andi@firstfloor.org>
To: linux-kernel@vger.kernel.org
Cc: x86@kernel.org, Andi Kleen <ak@linux.intel.com>
Subject: [PATCH 1/2] x86: Use -mno-avx when available
Date: Wed, 28 Mar 2012 11:51:17 -0700	[thread overview]
Message-ID: <1332960678-11879-1-git-send-email-andi@firstfloor.org> (raw)

From: Andi Kleen <ak@linux.intel.com>

On gccs that support AVX it's a good idea to disable that too, similar to
how SSE2, SSE1 etc. are already disabled. This prevents the compiler
from generating AVX ever implicitely.

No failure observed, just from review.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 arch/x86/Makefile |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 209ba12..2c8aefd 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -113,6 +113,7 @@ KBUILD_CFLAGS += -Wno-sign-compare
 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 # prevent gcc from generating any FP code by mistake
 KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
+KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
 
 KBUILD_CFLAGS += $(mflags-y)
 KBUILD_AFLAGS += $(mflags-y)
-- 
1.7.7.6


             reply	other threads:[~2012-03-28 18:51 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-03-28 18:51 Andi Kleen [this message]
2012-03-28 18:51 ` [PATCH 2/2] Add CONFIG_READABLE_ASM Andi Kleen
2012-03-30 17:41   ` [tip:x86/cleanups] debug: " tip-bot for Andi Kleen
2012-04-12 19:08   ` [PATCH 2/2] " Geert Uytterhoeven
2012-04-12 19:36     ` H. Peter Anvin
2012-04-12 19:42       ` Geert Uytterhoeven
2012-04-12 19:40     ` Sam Ravnborg
2012-04-12 19:47       ` Geert Uytterhoeven
2012-04-12 19:52         ` Sam Ravnborg
2012-04-12 19:57         ` Andi Kleen
2012-04-12 20:07           ` Sam Ravnborg
2012-04-12 20:17             ` Geert Uytterhoeven
2012-04-12 20:35               ` Sam Ravnborg
2012-05-08 19:36                 ` Geert Uytterhoeven
2012-05-12 20:23                   ` Geert Uytterhoeven
2012-05-12 20:25                     ` Sam Ravnborg
2012-03-30 17:16 ` [tip:x86/urgent] x86: Use -mno-avx when available tip-bot for Andi Kleen

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