From: Nick Desaulniers <ndesaulniers@google.com>
To: Masahiro Yamada <masahiroy@kernel.org>
Cc: Michal Marek <michal.lkml@markovi.net>,
Nathan Chancellor <nathan@kernel.org>, Tom Rix <trix@redhat.com>,
linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
llvm@lists.linux.dev, x86@kernel.org,
Dmitrii Bundin <dmitrii.bundin.a@gmail.com>,
Fangrui Song <maskray@google.com>,
Alexey Alexandrov <aalexand@google.com>,
Bill Wendling <morbo@google.com>,
Greg Thelen <gthelen@google.com>,
Nick Desaulniers <ndesaulniers@google.com>
Subject: [PATCH v2 0/5] fix debug info for asm and DEBUG_INFO_SPLIT
Date: Wed, 31 Aug 2022 11:44:03 -0700 [thread overview]
Message-ID: <20220831184408.2778264-1-ndesaulniers@google.com> (raw)
Alexey reported that the fraction of unknown filename instances in
kallsyms grew from ~0.3% to ~10% recently; Bill and Greg tracked it down
to assembler defined symbols, which regressed as a result of:
commit b8a9092330da ("Kbuild: do not emit debug info for assembly with LLVM_IAS=1")
In that commit, I allude to restoring debug info for assembler defined
symbols in a follow up patch, but it seems I forgot to do so in
commit a66049e2cf0e ("Kbuild: make DWARF version a choice")
Do so requires a fixup for as-option, which seems to be failing when
used in scripts/Makefile.debug.
Also includes a fix for DEBUG_INFO_SPLIT while I'm here. Dmitrii
reports that this has been broken since gcc-11+ & clang-12+. I'm
guessing no one uses this .config option...since no one else has
reported it being broken yet...
Changes from v1 -> v2:
* 5 patches now, rather than 3.
* Split change to arch/x86/boot/compressed/Makefile off of first patch,
as per Masahiro.
* Introduce compiler specific macros, as per Bill, and eradicate
cc-ifversion while I'm at it.
* Update commit message of final patch to refer to 866ced950bcd.
v1: https://lore.kernel.org/llvm/20220826181035.859042-1-ndesaulniers@google.com/
Nick Desaulniers (5):
x86/boot/compressed: prefer cc-option for CFLAGS additions
Makefile.compiler: Use KBUILD_AFLAGS for as-option
Makefile.compiler: replace cc-ifversion with compiler-specific macros
Makefile.debug: re-enable debug info for .S files
Makefile.debug: set -g unconditional on CONFIG_DEBUG_INFO_SPLIT
Documentation/kbuild/makefiles.rst | 44 +++++++++++++++------
Makefile | 4 +-
arch/x86/boot/compressed/Makefile | 2 +-
drivers/gpu/drm/amd/display/dc/dml/Makefile | 12 ++----
scripts/Makefile.compiler | 21 +++++++---
scripts/Makefile.debug | 26 ++++++++----
6 files changed, 72 insertions(+), 37 deletions(-)
--
2.37.2.672.g94769d06f0-goog
next reply other threads:[~2022-08-31 18:44 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-31 18:44 Nick Desaulniers [this message]
2022-08-31 18:44 ` [PATCH v2 1/5] x86/boot/compressed: prefer cc-option for CFLAGS additions Nick Desaulniers
2022-08-31 19:41 ` Nathan Chancellor
2022-08-31 18:44 ` [PATCH v2 2/5] Makefile.compiler: Use KBUILD_AFLAGS for as-option Nick Desaulniers
2022-08-31 19:53 ` Nathan Chancellor
2022-09-05 9:09 ` Masahiro Yamada
2022-09-06 16:08 ` Nathan Chancellor
2022-09-07 4:14 ` Masahiro Yamada
2022-09-07 3:12 ` Nick Desaulniers
2022-09-07 4:27 ` Masahiro Yamada
2022-08-31 18:44 ` [PATCH v2 3/5] Makefile.compiler: replace cc-ifversion with compiler-specific macros Nick Desaulniers
2022-08-31 20:08 ` Nathan Chancellor
2022-09-05 6:44 ` Masahiro Yamada
2022-08-31 18:44 ` [PATCH v2 4/5] Makefile.debug: re-enable debug info for .S files Nick Desaulniers
2022-08-31 20:22 ` Nathan Chancellor
2022-09-05 7:49 ` Masahiro Yamada
2022-09-07 4:27 ` Nick Desaulniers
2022-08-31 18:44 ` [PATCH v2 5/5] Makefile.debug: set -g unconditional on CONFIG_DEBUG_INFO_SPLIT Nick Desaulniers
2022-08-31 20:23 ` Nathan Chancellor
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