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    Subject[PATCH 5.4 01/80] Makefile.extrawarn: Move -Wunaligned-access to W=1
    Date
    From: Nathan Chancellor <nathan@kernel.org>

    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@vger.kernel.org
    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@kernel.org>
    Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
    Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
    [nathan: Fix conflict due to lack of afe956c577b2d]
    Signed-off-by: Nathan Chancellor <nathan@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    scripts/Makefile.extrawarn | 1 +
    1 file changed, 1 insertion(+)

    --- a/scripts/Makefile.extrawarn
    +++ b/scripts/Makefile.extrawarn
    @@ -49,6 +49,7 @@ KBUILD_CFLAGS += -Wno-format
    KBUILD_CFLAGS += -Wno-sign-compare
    KBUILD_CFLAGS += -Wno-format-zero-length
    KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast)
    +KBUILD_CFLAGS += $(call cc-disable-warning, unaligned-access)
    endif

    endif

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