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Commit d89051f0 authored by Matthias Kaehlcke's avatar Matthias Kaehlcke Committed by Greg Hackmann
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UPSTREAM: x86/kbuild: Use cc-option to enable -falign-{jumps/loops} 



clang currently does not support these optimizations, only enable them
when they are available.

Signed-off-by: default avatarMatthias Kaehlcke <mka@chromium.org>
Cc: Greg Hackmann <ghackmann@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Michael Davidson <md@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: grundler@chromium.org
Link: http://lkml.kernel.org/r/20170413172609.118122-1-mka@chromium.org


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
(cherry picked from commit 2c4fd1ac3ff167c91272dc43c7bfd2269ef61557)
parent 27836ce3

arch/x86/Makefile

+2 −2
Original line number Diff line number Diff line
@@ -88,10 +88,10 @@ else 
        KBUILD_CFLAGS += -m64



        # Align jump targets to 1 byte, not the default 16 bytes:

        KBUILD_CFLAGS += -falign-jumps=1

        KBUILD_CFLAGS += $(call cc-option,-falign-jumps=1)



        # Pack loops tightly as well:

        KBUILD_CFLAGS += -falign-loops=1

        KBUILD_CFLAGS += $(call cc-option,-falign-loops=1)



        # Don't autogenerate traditional x87 instructions

        KBUILD_CFLAGS += $(call cc-option,-mno-80387)