* FAILED: patch "[PATCH] Kbuild: do not emit debug info for assembly with LLVM_IAS=1" failed to apply to 5.4-stable tree
@ 2020-12-09 9:04 gregkh
2020-12-10 21:23 ` Nick Desaulniers
0 siblings, 1 reply; 2+ messages in thread
From: gregkh @ 2020-12-09 9:04 UTC (permalink / raw)
To: ndesaulniers, dima, masahiroy, maskray, natechancellor,
sedat.dilek, stable
Cc: stable
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@vger.kernel.org>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From b8a9092330da2030496ff357272f342eb970d51b Mon Sep 17 00:00:00 2001
From: Nick Desaulniers <ndesaulniers@google.com>
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@vger.kernel.org>
Link: https://github.com/ClangBuiltLinux/linux/issues/716
Reported-by: Dmitry Golovin <dima@golovin.in>
Reported-by: Nathan Chancellor <natechancellor@gmail.com>
Suggested-by: Dmitry Golovin <dima@golovin.in>
Suggested-by: Nathan Chancellor <natechancellor@gmail.com>
Suggested-by: Sedat Dilek <sedat.dilek@gmail.com>
Reviewed-by: Fangrui Song <maskray@google.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
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
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: FAILED: patch "[PATCH] Kbuild: do not emit debug info for assembly with LLVM_IAS=1" failed to apply to 5.4-stable tree
2020-12-09 9:04 FAILED: patch "[PATCH] Kbuild: do not emit debug info for assembly with LLVM_IAS=1" failed to apply to 5.4-stable tree gregkh
@ 2020-12-10 21:23 ` Nick Desaulniers
0 siblings, 0 replies; 2+ messages in thread
From: Nick Desaulniers @ 2020-12-10 21:23 UTC (permalink / raw)
Cc: Dmitry Golovin, Masahiro Yamada, Fangrui Song, Nathan Chancellor,
Sedat Dilek, # 3.4.x, Greg KH
On Wed, Dec 9, 2020 at 1:03 AM <gregkh@linuxfoundation.org> 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@vger.kernel.org>.
Cross referencing the thread where manual backports were provided:
https://lore.kernel.org/stable/CAKwvOdnGDHn+Y+g5AsKvOFiuF7iVAJ8+x53SgWxH9ejqEZwY9w@mail.gmail.com/
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@google.com>
> 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@vger.kernel.org>
> Link: https://github.com/ClangBuiltLinux/linux/issues/716
> Reported-by: Dmitry Golovin <dima@golovin.in>
> Reported-by: Nathan Chancellor <natechancellor@gmail.com>
> Suggested-by: Dmitry Golovin <dima@golovin.in>
> Suggested-by: Nathan Chancellor <natechancellor@gmail.com>
> Suggested-by: Sedat Dilek <sedat.dilek@gmail.com>
> Reviewed-by: Fangrui Song <maskray@google.com>
> Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
>
> 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
^ permalink raw reply [flat|nested] 2+ messages in thread
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2020-12-10 21:23 ` Nick Desaulniers
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