aboutsummaryrefslogtreecommitdiffstats
path: root/arch/x86/Makefile
diff options
context:
space:
mode:
authorH. Peter Anvin <hpa@linux.intel.com>2013-12-09 18:43:38 -0500
committerH. Peter Anvin <hpa@linux.intel.com>2013-12-09 18:52:39 -0500
commit8b3b005d675726e38bc504d2e35a991e55819155 (patch)
tree1141dafd5c7c9395329f5ae2ba8e676ea6e2df6f /arch/x86/Makefile
parent374b105797c3d4f29c685f3be535c35f5689b30e (diff)
x86, build: Pass in additional -mno-mmx, -mno-sse options
In checkin 5551a34e5aea x86-64, build: Always pass in -mno-sse we unconditionally added -mno-sse to the main build, to keep newer compilers from generating SSE instructions from autovectorization. However, this did not extend to the special environments (arch/x86/boot, arch/x86/boot/compressed, and arch/x86/realmode/rm). Add -mno-sse to the compiler command line for these environments, and add -mno-mmx to all the environments as well, as we don't want a compiler to generate MMX code either. This patch also removes a $(cc-option) call for -m32, since we have long since stopped supporting compilers too old for the -m32 option, and in fact hardcode it in other places in the Makefiles. Reported-by: Kevin B. Smith <kevin.b.smith@intel.com> Cc: Sunil K. Pandey <sunil.k.pandey@intel.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> Cc: H. J. Lu <hjl.tools@gmail.com> Link: http://lkml.kernel.org/n/tip-j21wzqv790q834n7yc6g80j1@git.kernel.org Cc: <stable@vger.kernel.org> # build fix only
Diffstat (limited to 'arch/x86/Makefile')
-rw-r--r--arch/x86/Makefile8
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index eda00f9be0cf..57d021507120 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -31,8 +31,8 @@ ifeq ($(CONFIG_X86_32),y)
31 31
32 KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return 32 KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
33 33
34 # Don't autogenerate SSE instructions 34 # Don't autogenerate MMX or SSE instructions
35 KBUILD_CFLAGS += -mno-sse 35 KBUILD_CFLAGS += -mno-mmx -mno-sse
36 36
37 # Never want PIC in a 32-bit kernel, prevent breakage with GCC built 37 # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
38 # with nonstandard options 38 # with nonstandard options
@@ -60,8 +60,8 @@ else
60 KBUILD_AFLAGS += -m64 60 KBUILD_AFLAGS += -m64
61 KBUILD_CFLAGS += -m64 61 KBUILD_CFLAGS += -m64
62 62
63 # Don't autogenerate SSE instructions 63 # Don't autogenerate MMX or SSE instructions
64 KBUILD_CFLAGS += -mno-sse 64 KBUILD_CFLAGS += -mno-mmx -mno-sse
65 65
66 # Use -mpreferred-stack-boundary=3 if supported. 66 # Use -mpreferred-stack-boundary=3 if supported.
67 KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3) 67 KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3)