Re: [PATCH] tracing: samples: avoid warning about __aeabi_unwind_cpp_pr1

[Vincent Donnefort <vdonnefort@google.com>]

On Wed, May 13, 2026 at 10:59:39AM -0400, Steven Rostedt wrote:
> 
> Vincent,
> 
> Is this patch needed? That is, did it fall through the cracks?

Yes, I believe it is! 

Reviewed-by: Vincent Donnefort <vdonnefort@google.com>

> 
> -- Steve
> 
> On Mon, 23 Mar 2026 11:56:41 +0100
> Arnd Bergmann <arnd@kernel.org> wrote:
> 
> > From: Arnd Bergmann <arnd@arndb.de>
> > 
> > The now more verbose check found another symbol missing from the whitelist:
> > 
> > Unexpected symbols in kernel/trace/simple_ring_buffer.o:
> >          U __aeabi_unwind_cpp_pr1
> > 
> > Add this to the Makefile.
> > 
> > Fixes: 1211907ac0b5 ("tracing: Generate undef symbols allowlist for simple_ring_buffer")
> > Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> > ---
> >  kernel/trace/Makefile | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
> > index d662c1a64cd5..aba6a25db17b 100644
> > --- a/kernel/trace/Makefile
> > +++ b/kernel/trace/Makefile
> > @@ -169,8 +169,8 @@ targets += undefsyms_base.o
> >  # because it is not linked into vmlinux.
> >  KASAN_SANITIZE_undefsyms_base.o := y
> >  
> > -UNDEFINED_ALLOWLIST = __asan __gcov __kasan __kcsan __hwasan __sancov __sanitizer __tsan __ubsan __x86_indirect_thunk \
> > -		      __msan simple_ring_buffer \
> > +UNDEFINED_ALLOWLIST = __asan __gcov __kasan __kcsan __hwasan __sancov __sanitizer __tsan __ubsan __msan \
> > +		      __x86_indirect_thunk __aeabi_unwind_cpp simple_ring_buffer \
> >  		      $(shell $(NM) -u $(obj)/undefsyms_base.o 2>/dev/null | awk '{print $$2}')
> >  
> >  quiet_cmd_check_undefined = NM      $<
>