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Commit e2b34e31 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

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
parents 2bd3488f d9b0cde9

arch/x86/Makefile

+3 −0
Original line number Diff line number Diff line
@@ -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)