Re: trace/simple_ring_buffer build failure on parisc, sparc64

[Vincent Donnefort]

On Tue, Sep 22, 2026 at 08:57:05AM -0700, Guenter Roeck wrote:
> Hi,
> 
> when trying to build parisc:allmodconfig or sparc64:allmodconfig,
> I get the following errors.
> 
> Building parisc:allmodconfig ... failed
> --------------
> Error log:
> Unexpected symbols in kernel/trace/simple_ring_buffer.o:
>          U __atomic_hash
>          U trace_hardirqs_off
>          U trace_hardirqs_on
>          U warn_bogus_irq_restore
> 
> Building sparc64:allmodconfig ... failed
> --------------
> Error log:
> Unexpected symbols in kernel/trace/simple_ring_buffer.o:
>                  U 
>                  U 
>                  U current_thread_info_reg

Thanks for the report. I could reproduce with clang. I should have a fix
shortly.

> 
> I always thought this has to do with my environment and/or C compiler, but
> it seems as if the problem appears to be generic.
> 
> I have no idea what causes the problem, why only those architectures are
> affected, or how to fix it. If anyone has an idea, please let me know and
> I'll be happy to write a patch and/or test it.
> 
> I disabled CONFIG_RING_BUFFER for test builds of parisc and sparc64 for
> now, so this does not directly affect my test builds anymore. This is
> primarily a report that the problem exists, not a request to fix it.
> 
> Thanks,
> Guenter

-- 
Vincent