On Mon, Feb 02, 2026 at 05:18:13PM +0100, Arnd Bergmann wrote:
> Hi,
>
> I see a new objtool related build failure on current linux-next
> with clang-21:
>
> samples/livepatch/livepatch-shadow-fix1.o: error: objtool: static_call: can't
> find static_call_key symbol: __SCK__WARN_trap
>
> I couldn't figure out what exactly is going on there, this seems fine
> with gcc, and so far only one of hundreds of configs has this issue.
>
> See the attachments for .config and the object file.
Ah, this is CONFIG_MEM_ALLOC_PROFILING_DEBUG inserting a WARN() in the
sample livepatch module's memory allocation, triggering the following
warning (file->klp is true):
if (!key_sym) {
if (!opts.module || file->klp) {
ERROR("static_call: can't find static_call_key
symbol: %s", tmp);
return -1;
}
So this is showing that the sample livepatch modules (which are built
differently from the new klp-build way of building livepatch modules)
will fail to build when trying to access a non-exported static key.
I will need to stare at that a bit to try to figure out a fix.
--
Josh
