Re: [PATCH v10 1/4] kallsyms: embed source file:line info in kernel stack traces

[Sasha Levin <sashal@kernel.org>]

On Tue, Nov 03, 2026 at 11:15:24AM +0000, sashiko-bot@kernel.org wrote:
[...]
>In elfutils, libdw.pc lists libelf under Requires.private rather than
>Requires.

It's under Requires, so pkg-config prints "-ldw -lelf".

[...]
>Can unfiltered ELF symbols in collect_symbol_starts() in
>scripts/gen_lineinfo.c corrupt the symbol extents in text_starts[]?

No. Filtering them changes nothing on x86, arm64, riscv or powerpc. On
arm it drops three $a symbols that start line-program sequences with no
named symbol, and those addresses lose their annotation.

[...]
>Additionally, why does collect_symbol_starts() exclude STT_NOTYPE and
>unsized symbols from sym_starts[]?

Without a size there is no way to check that a covering row belongs to
the symbol. Untyped labels that start code are almost all in assembly,
which gets a row per instruction anyway.

--
Thanks,
Sasha