On Mon, Mar 18, 2019 at 2:10 PM Matthias Kaehlcke <mka@xxxxxxxxxxxx> wrote: > > 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. Does scripts/checkpatch.pl complain about this format (full sha, no title)? Not sure that necessitates a v2, but if so would be good to mention that Clang generates excessive calls into libgcc/compiler-rt at -Oz. Thanks for the patch and the discussion/sanity check. Reviewed-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> > > Suggested-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > Signed-off-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx> > --- > Makefile | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/Makefile b/Makefile > index 9ef547fc7ffe..191f3ce3cb5e 100644 > --- a/Makefile > +++ b/Makefile > @@ -667,7 +667,7 @@ KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) > KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) > > ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE > -KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) > +KBUILD_CFLAGS += -Os > else > KBUILD_CFLAGS += -O2 > endif > -- > 2.21.0.225.g810b269d1ac-goog -- Thanks, ~Nick Desaulniers
