From: tip-bot for Andi Kleen <ak@linux.intel.com>
To: linux-tip-commits@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@kernel.org,
ak@linux.intel.com, stable@vger.kernel.org, tglx@linutronix.de
Subject: [tip:x86/urgent] x86: Use -mno-avx when available
Date: Fri, 30 Mar 2012 10:16:44 -0700 [thread overview]
Message-ID: <tip-c0e9afc0da6cb0f11497e5ea83377b3c451450e0@git.kernel.org> (raw)
In-Reply-To: <1332960678-11879-1-git-send-email-andi@firstfloor.org>
Commit-ID: c0e9afc0da6cb0f11497e5ea83377b3c451450e0
Gitweb: http://git.kernel.org/tip/c0e9afc0da6cb0f11497e5ea83377b3c451450e0
Author: Andi Kleen <ak@linux.intel.com>
AuthorDate: Wed, 28 Mar 2012 11:51:17 -0700
Committer: H. Peter Anvin <hpa@zytor.com>
CommitDate: Fri, 30 Mar 2012 10:06:39 -0700
x86: Use -mno-avx when available
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.
[ hpa: Marking this for urgent and stable, simply because the patch
will either have absolutely no effect *or* it will avoid potentially
very hard to debug failures. ]
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1332960678-11879-1-git-send-email-andi@firstfloor.org
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: <stable@vger.kernel.org>
---
arch/x86/Makefile | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 968dbe2..41a7237 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -129,6 +129,7 @@ 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)
prev parent reply other threads:[~2012-03-30 17:17 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-28 18:51 [PATCH 1/2] x86: Use -mno-avx when available Andi Kleen
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-bot for Andi Kleen [this message]
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