4.9-stable review patch. If anyone has any objections, please let me know.
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From: Matthias Kaehlcke mka@chromium.org
commit 2c4fd1ac3ff167c91272dc43c7bfd2269ef61557 upstream.
clang currently does not support these optimizations, only enable them when they are available.
Signed-off-by: Matthias 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: Ingo Molnar mingo@kernel.org Signed-off-by: Nick Desaulniers ndesaulniers@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/Makefile | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -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)