path: root/arch/x86
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authorH. Peter Anvin <hpa@linux.intel.com>2013-11-20 13:31:49 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-12-11 22:36:27 -0800
commit5e43e33a63d72c6bd30f9fa14a9e82ffb58be422 (patch)
treecd31170231bb9dc54bd6e257e939319f02773cd1 /arch/x86
parenteb050d976ccdff8c5499a826c19a818868824393 (diff)
x86-64, build: Always pass in -mno-sse
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 <kevin.b.smith@intel.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> Cc: H. J. Lu <hjl.tools@gmail.com> Link: http://lkml.kernel.org/n/tip-j21wzqv790q834n7yc6g80j1@git.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/x86')
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 5c477260294..d5cf85057d6 100644
--- 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
+ # 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)