Re: [PATCH v3 3/3] module/kallsyms: Filter out local and mapping symbols during module load

[Tiezhu Yang]

On 2026/8/18 下午7:59, Petr Pavlu wrote:
> On 8/12/26 5:28 AM, Tiezhu Yang wrote:
> > The compiler toolchains generate local and mapping symbols on certain
> > architectures like LoongArch for optimizations and relocations.
>
> Nit: "local" -> "local label".

OK, will update the patch subject and commit message in v4.

> > While the symbols are already filtered out during runtime lookups via
> > find_kallsyms_symbol(), they still leak into /proc/kallsyms for loaded
> > modules because layout_symtab() and add_kallsyms() do not filter them
> > during load time.
> >
> > Consequently, tracing tools like bpftrace (which do not perform internal
> > filtering, unlike perf) resolve identical addresses into confusing local
> > labels instead of actual clear C function names.
> >
> > Fix this by integrating the is_local_mapping_symbol() check directly into
> > the newly introduced is_kept_symbol() helper. This ensures these unneeded
> > symbols are stripped during module load time, keeping /proc/kallsyms clean
> > and resulting in accurate call stacks.
> >
> > Signed-off-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
>
> Reviewed-by: Petr Pavlu <petr.pavlu@xxxxxxxx>

Thanks,
Tiezhu