This is a note to let you know that I've just added the patch titled
x86, build: Pass in additional -mno-mmx, -mno-sse options
to the 3.4-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-build-pass-in-additional-mno-mmx-mno-sse-options.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 612e9718fa791e611c17e1949841766b122a817b Mon Sep 17 00:00:00 2001
From: "H. Peter Anvin" <[email protected]>
Date: Mon, 9 Dec 2013 15:43:38 -0800
Subject: x86, build: Pass in additional -mno-mmx, -mno-sse options
From: "H. Peter Anvin" <[email protected]>
commit 8b3b005d675726e38bc504d2e35a991e55819155 upstream.
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 <[email protected]>
Cc: Sunil K. Pandey <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>
Cc: H. J. Lu <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
[bwh: Backported to 3.2:
- Drop changes to arch/x86/Makefile, which sets these flags earlier
- Adjust context
- Drop changes to arch/x86/realmode/rm/Makefile which doesn't exist]
Signed-off-by: Ben Hutchings <[email protected]>
Cc: Rui Xiang <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/x86/boot/Makefile | 6 +++---
arch/x86/boot/compressed/Makefile | 1 +
2 files changed, 4 insertions(+), 3 deletions(-)
--- a/arch/x86/boot/Makefile
+++ b/arch/x86/boot/Makefile
@@ -52,18 +52,18 @@ $(obj)/cpustr.h: $(obj)/mkcpustr FORCE
# How to compile the 16-bit code. Note we always compile for -march=i386,
# that way we can complain to the user if the CPU is insufficient.
-KBUILD_CFLAGS := $(LINUXINCLUDE) -g -Os -D_SETUP -D__KERNEL__ \
+KBUILD_CFLAGS := $(LINUXINCLUDE) -m32 -g -Os -D_SETUP -D__KERNEL__ \
-DDISABLE_BRANCH_PROFILING \
-Wall -Wstrict-prototypes \
-march=i386 -mregparm=3 \
-include $(srctree)/$(src)/code16gcc.h \
-fno-strict-aliasing -fomit-frame-pointer \
+ -mno-mmx -mno-sse \
$(call cc-option, -ffreestanding) \
$(call cc-option, -fno-toplevel-reorder,\
- $(call cc-option, -fno-unit-at-a-time)) \
+ $(call cc-option, -fno-unit-at-a-time)) \
$(call cc-option, -fno-stack-protector) \
$(call cc-option, -mpreferred-stack-boundary=2)
-KBUILD_CFLAGS += $(call cc-option, -m32)
KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__
GCOV_PROFILE := n
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -12,6 +12,7 @@ KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFIL
cflags-$(CONFIG_X86_32) := -march=i386
cflags-$(CONFIG_X86_64) := -mcmodel=small
KBUILD_CFLAGS += $(cflags-y)
+KBUILD_CFLAGS += -mno-mmx -mno-sse
KBUILD_CFLAGS += $(call cc-option,-ffreestanding)
KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector)
Patches currently in stable-queue which might be from [email protected] are
queue-3.4/x86-sandy-bridge-mark-arrays-in-__init-functions-as-__initconst.patch
queue-3.4/x86-64-modify_ldt-make-support-for-16-bit-segments-a-runtime-option.patch
queue-3.4/x86-fix-build-error-and-kconfig-for-ia32_emulation-and-binfmt.patch
queue-3.4/x86-build-icc-remove-uninitialized_var-from-compiler-intel.h.patch
queue-3.4/x86-build-pass-in-additional-mno-mmx-mno-sse-options.patch
queue-3.4/x86-mm-hugetlb-add-missing-tlb-page-invalidation-for-hugetlb_cow.patch
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