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Makefile: Use -O3 optimization for CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE

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-O3 is much more stable with modern compilers these days than it was a
decade ago. Using -O3 on the kernel results in significantly improved
hackbench performance, which is a sign that overall performance in the
kernel is improved. It works especially well in conjunction with LTO.

Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com>
This commit is contained in:
Sultan Alsawaf 2020-03-11 11:30:06 -07:00 committed by Gagan Malvi
parent 67d97cca47
commit 938a706b23
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1 changed files with 1 additions and 1 deletions
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Makefile
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@ -703,7 +703,7 @@ KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
KBUILD_CFLAGS += -Os
else
KBUILD_CFLAGS += -O2
KBUILD_CFLAGS += -O3
endif
# Tell gcc to never replace conditional load with a non-conditional one