Re: trace/simple_ring_buffer build failure on parisc, sparc64

[Vincent Donnefort <vdonnefort@google.com>]

On Wed, Sep 23, 2026 at 08:19:08AM +0100, Vincent Donnefort wrote:
> 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

https://lore.kernel.org/linux-trace-kernel/20260923074213.3077182-1-vdonnefort@google.com/T/#t

Is that good enough?

-- 
Vincent