On Thu, Feb 25, 2021 at 12:06 PM Andrew Morton <a...@linux-foundation.org> wrote: > > On Thu, 25 Feb 2021 12:03:48 -0800 Kees Cook <keesc...@chromium.org> wrote: > > > On Thu, Feb 25, 2021 at 05:45:09PM +0100, Arnd Bergmann wrote: > > > From: Arnd Bergmann <a...@arndb.de> > > > > > > Separating compiler-clang.h from compiler-gcc.h inadventently dropped the > > > definitions of the three HAVE_BUILTIN_BSWAP macros, which requires falling > > > back to the open-coded version and hoping that the compiler detects it. > > > > > > Since all versions of clang support the __builtin_bswap interfaces, > > > add back the flags and have the headers pick these up automatically. > > > > > > This results in a 4% improvement of compilation speed for arm defconfig. > > > > > > Fixes: 815f0ddb346c ("include/linux/compiler*.h: make compiler-*.h > > > mutually exclusive") > > > Signed-off-by: Arnd Bergmann <a...@arndb.de> > > > > Cc: sta...@vger.kernel.org > > I figured 4% better compile time isn't significant enough to justify a > backport. Thoughts?
If I made a mistake in 815f0ddb346c, then it would be important to correct it since 815f0ddb346c has existed for a few stable branches (first landed in v4.19-rc1). Acked-by: Nick Desaulniers <ndesaulni...@google.com> > > > Reviewed-by: Kees Cook <keesc...@chromium.org> > -- Thanks, ~Nick Desaulniers