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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-22 21:46:27 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-22 21:46:27 +0200 |
| commit | e2b34e311be3a57c9abcb927e37a57e38913714c (patch) | |
| tree | 07bbce0b6577f6ae56ac27a60ecce0ffb966e44e | |
| parent | Merge branch 'x86-uv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/... (diff) | |
| parent | x86-64, gcc: Use -mpreferred-stack-boundary=3 if supported (diff) | |
| download | linux-e2b34e311be3a57c9abcb927e37a57e38913714c.tar.xz linux-e2b34e311be3a57c9abcb927e37a57e38913714c.zip | |
Merge branch 'x86-build-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull a x86/build change from Ingo Molnar.
This makes the default stack alignment on x86-64 be just 8, allowing for
improved code generation (it can avoid some unnecessary extra alignment
logic and use just pure push/pop sequences) and smaller stack frames.
We can't generally do SSE with 16-byte alignment issues in the kernel anyway.
* 'x86-build-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86-64, gcc: Use -mpreferred-stack-boundary=3 if supported
| -rw-r--r-- | arch/x86/Makefile | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/Makefile b/arch/x86/Makefile index 1f2521434554..b0c5276861ec 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -49,6 +49,9 @@ else KBUILD_AFLAGS += -m64 KBUILD_CFLAGS += -m64 + # Use -mpreferred-stack-boundary=3 if supported. + KBUILD_CFLAGS += $(call cc-option,-mno-sse -mpreferred-stack-boundary=3) + # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu) cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8) cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona) |