On Mon, Feb 14, 2022 at 09:16:42AM -0700, Nathan Chancellor wrote: > commit 1cf5f151d25fcca94689efd91afa0253621fb33a upstream. > > -Wunaligned-access is a new warning in clang that is default enabled for > arm and arm64 under certain circumstances within the clang frontend (see > LLVM commit below). On v5.17-rc2, an ARCH=arm allmodconfig build shows > 1284 total/70 unique instances of this warning (most of the instances > are in header files), which is quite noisy. > > To keep a normal build green through CONFIG_WERROR, only show this > warning with W=1, which will allow automated build systems to catch new > instances of the warning so that the total number can be driven down to > zero eventually since catching unaligned accesses at compile time would > be generally useful. > > Cc: stable@xxxxxxxxxxxxxxx > Link: https://github.com/llvm/llvm-project/commit/35737df4dcd28534bd3090157c224c19b501278a > Link: https://github.com/ClangBuiltLinux/linux/issues/1569 > Link: https://github.com/ClangBuiltLinux/linux/issues/1576 > Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx> > Reviewed-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> > Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx> > [nathan: Fix conflict due to lack of afe956c577b2d] > Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx> > --- > > I am not sure how many people are using ToT clang with ARCH=arm on > stable but given how noisy this warning can be, I think it is worth > applying this to all applicable stable branches. > > This applies to 4.9 through 5.4 with 'patch -Np1'. > > scripts/Makefile.extrawarn | 1 + > 1 file changed, 1 insertion(+) Now queued up, thanks. greg k-h
