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| author |   Changbin Du <changbin.du@gmail.com> | 2022-02-01 09:32:57 +0800 |
|---|---|---|
| committer |   Masahiro Yamada <masahiroy@kernel.org> | 2022-02-22 00:44:16 +0900 |
| commit | d4c858643263cfde13f7d937eaff95c2ed87cdf1 (patch) | |
| tree | 4f21e2ed385c1ebc43953a46b329991b3b9f4455 /scripts/kallsyms.c | |
| parent | kconfig: fix missing '# end of' for empty menu (diff) | |
| download | linux-dev-d4c858643263cfde13f7d937eaff95c2ed87cdf1.tar.xz linux-dev-d4c858643263cfde13f7d937eaff95c2ed87cdf1.zip | |
kallsyms: ignore all local labels prefixed by '.L'
The llvm compiler can generate lots of local labels ('.LBB', '.Ltmpxxx',
'.L__unnamed_xx', etc.). These symbols usually are useless for debugging.
And they might overlap with handwritten symbols.
Before this change, a dumpstack shows a local symbol for epc:
[ 0.040341][ T0] Hardware name: riscv-virtio,qemu (DT)
[ 0.040376][ T0] epc : .LBB6_14+0x22/0x6a
[ 0.040452][ T0] ra : restore_all+0x12/0x6e
The simple solution is that we can ignore all local labels prefixed by '.L'.
For handwritten symbols which need to be preserved should drop the '.L'
prefix.
After this change, the C defined symbol is shown so we can locate the
problematical code immediately:
[ 0.035795][ T0] Hardware name: riscv-virtio,qemu (DT)
[ 0.036332][ T0] epc : trace_hardirqs_on+0x54/0x13c
[ 0.036567][ T0] ra : restore_all+0x12/0x6e
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Diffstat (limited to 'scripts/kallsyms.c')
| -rw-r--r-- | scripts/kallsyms.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c index 54ad86d13784..8caabddf817c 100644 --- a/scripts/kallsyms.c +++ b/scripts/kallsyms.c @@ -108,7 +108,7 @@ static bool is_ignored_symbol(const char *name, char type) /* Symbol names that begin with the following are ignored.*/ static const char * const ignored_prefixes[] = { "$", /* local symbols for ARM, MIPS, etc. */ - ".LASANPC", /* s390 kasan local symbols */ + ".L", /* local labels, .LBB,.Ltmpxxx,.L__unnamed_xx,.LASANPC, etc. */ "__crc_", /* modversions */ "__efistub_", /* arm64 EFI stub namespace */ "__kvm_nvhe_", /* arm64 non-VHE KVM namespace */ |