Re: [PATCH v3 3/3] module/kallsyms: Filter out local and mapping symbols during module load
Petr Pavlu <[email protected]>
| Newsgroups | dev.linux.lists.loongarch,org.kernel.vger.linux-kernel,org.kernel.vger.linux-modules |
|---|---|
| Message-ID | <[email protected]> |
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 <[email protected]> Reviewed-by: Petr Pavlu <[email protected]> -- Thanks, Petr