This is a note to let you know that I've just added the patch titled
x86-64, build: Always pass in -mno-sse
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-64-build-always-pass-in-mno-sse.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 5551a34e5aeab868f8d37f70d8754868921b4ee5 Mon Sep 17 00:00:00 2001
From: "H. Peter Anvin" <[email protected]>
Date: Wed, 20 Nov 2013 13:31:49 -0800
Subject: x86-64, build: Always pass in -mno-sse
From: "H. Peter Anvin" <[email protected]>
commit 5551a34e5aeab868f8d37f70d8754868921b4ee5 upstream.
Always pass in the -mno-sse argument, regardless if
-preferred-stack-boundary is supported. We never want to generate SSE
instructions in the kernel unless we *really* know what we're doing.
According to H. J. Lu, any version of gcc new enough that we support
it at all should handle the -mno-sse option, so just add it
unconditionally.
Reported-by: Kevin B. Smith <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>
Cc: H. J. Lu <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/x86/Makefile | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -31,6 +31,9 @@ ifeq ($(CONFIG_X86_32),y)
KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
+ # Don't autogenerate SSE instructions
+ KBUILD_CFLAGS += -mno-sse
+
# Never want PIC in a 32-bit kernel, prevent breakage with GCC built
# with nonstandard options
KBUILD_CFLAGS += -fno-pic
@@ -57,8 +60,11 @@ else
KBUILD_AFLAGS += -m64
KBUILD_CFLAGS += -m64
+ # Don't autogenerate SSE instructions
+ KBUILD_CFLAGS += -mno-sse
+
# Use -mpreferred-stack-boundary=3 if supported.
- KBUILD_CFLAGS += $(call cc-option,-mno-sse -mpreferred-stack-boundary=3)
+ KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3)
# FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
Patches currently in stable-queue which might be from [email protected] are
queue-3.12/x86-64-build-always-pass-in-mno-sse.patch
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