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

[Petr Pavlu]

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".

> 
> 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,
Petr