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authorH. Peter Anvin <hpa@linux.intel.com>2013-11-20 13:31:49 -0800
committerH. Peter Anvin <hpa@linux.intel.com>2013-12-03 17:40:22 -0800
commit5551a34e5aeab868f8d37f70d8754868921b4ee5 (patch)
treeb3ed8f5e9270648e76d5f67d1787f8cbaf22daf7
parentfdeadb43fdf1e7d5698c027b555c389174548e5a (diff)
x86-64, build: Always pass in -mno-sse
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 Cc: <stable@vger.kernel.org> # build fix only
-rw-r--r--arch/x86/Makefile8
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 41250fb33985..eda00f9be0cf 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
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)