| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 164/168] Revert "kbuild: use -Oz instead of -Os when using clang" | Date | Wed, 24 Apr 2019 19:10:08 +0200 |
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commit a75bb4eb9e565b9f5115e2e8c07377ce32cbe69a upstream.
The clang option -Oz enables *aggressive* optimization for size, which doesn't necessarily result in smaller images, but can have negative impact on performance. Switch back to the less aggressive -Os.
This reverts commit 6748cb3c299de1ffbe56733647b01dbcc398c419.
Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Matthias Kaehlcke <mka@chromium.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/Makefile b/Makefile index 7bf3fb717921..cc621fbe6c62 100644 --- a/Makefile +++ b/Makefile @@ -639,7 +639,7 @@ KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) KBUILD_CFLAGS += $(call cc-disable-warning, attribute-alias) ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE -KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) +KBUILD_CFLAGS += -Os else ifdef CONFIG_PROFILE_ALL_BRANCHES KBUILD_CFLAGS += -O2 -- 2.19.1
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