On Wed, Dec 9, 2020 at 1:03 AM <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > > The patch below does not apply to the 5.4-stable tree. > If someone wants it applied there, or to any other stable or longterm > tree, then please email the backport, including the original git commit > id to <stable@xxxxxxxxxxxxxxx>. Cross referencing the thread where manual backports were provided: https://lore.kernel.org/stable/CAKwvOdnGDHn+Y+g5AsKvOFiuF7iVAJ8+x53SgWxH9ejqEZwY9w@xxxxxxxxxxxxxx/ Sorry for the noise. > > thanks, > > greg k-h > > ------------------ original commit in Linus's tree ------------------ > > From b8a9092330da2030496ff357272f342eb970d51b Mon Sep 17 00:00:00 2001 > From: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> > Date: Mon, 9 Nov 2020 10:35:28 -0800 > Subject: [PATCH] Kbuild: do not emit debug info for assembly with LLVM_IAS=1 > > Clang's integrated assembler produces the warning for assembly files: > > warning: DWARF2 only supports one section per compilation unit > > If -Wa,-gdwarf-* is unspecified, then debug info is not emitted for > assembly sources (it is still emitted for C sources). This will be > re-enabled for newer DWARF versions in a follow up patch. > > Enables defconfig+CONFIG_DEBUG_INFO to build cleanly with > LLVM=1 LLVM_IAS=1 for x86_64 and arm64. > > Cc: <stable@xxxxxxxxxxxxxxx> > Link: https://github.com/ClangBuiltLinux/linux/issues/716 > Reported-by: Dmitry Golovin <dima@xxxxxxxxxx> > Reported-by: Nathan Chancellor <natechancellor@xxxxxxxxx> > Suggested-by: Dmitry Golovin <dima@xxxxxxxxxx> > Suggested-by: Nathan Chancellor <natechancellor@xxxxxxxxx> > Suggested-by: Sedat Dilek <sedat.dilek@xxxxxxxxx> > Reviewed-by: Fangrui Song <maskray@xxxxxxxxxx> > Reviewed-by: Nathan Chancellor <natechancellor@xxxxxxxxx> > Signed-off-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> > Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx> > > diff --git a/Makefile b/Makefile > index 87d659d3c8de..ae1592c1f5d6 100644 > --- a/Makefile > +++ b/Makefile > @@ -828,7 +828,9 @@ else > DEBUG_CFLAGS += -g > endif > > +ifneq ($(LLVM_IAS),1) > KBUILD_AFLAGS += -Wa,-gdwarf-2 > +endif > > ifdef CONFIG_DEBUG_INFO_DWARF4 > DEBUG_CFLAGS += -gdwarf-4 > -- Thanks, ~Nick Desaulniers
