Re: Linux 4.19 and GCC 9

[Ivan Babrou]

We are building the upstream kernel. There are a few patches, but
nothing related to objtool.

Unless you mean mainline/stable by upstream, I haven't tried that. We
stick to LTS.

On Thu, May 16, 2019 at 7:04 PM Josh Poimboeuf <jpoimboe@xxxxxxxxxx> wrote:
>
> On Thu, May 16, 2019 at 11:20:54PM +0200, Miguel Ojeda wrote:
> > > mm/slub.o: warning: objtool: init_cache_random_seq()+0x36: sibling
> > > call from callable instruction with modified stack frame
> > > mm/slub.o: warning: objtool: slab_out_of_memory()+0x3b: sibling call
> > > from callable instruction with modified stack frame
> > > mm/slub.o: warning: objtool: slab_pad_check.part.0()+0x7c: sibling
> > > call from callable instruction with modified stack frame
> > > mm/slub.o: warning: objtool: check_slab()+0x1c: sibling call from
> > > callable instruction with modified stack frame
> >
> > AFAIK those are non-critical, i.e. stack traces may be wrong (or not),
> > but it does not mean the generated kernel itself is wrong. CC'ing the
> > objtool maintainers too.
>
> I don't think I recognize those warnings.  Do you also see them in the
> upstream kernel?
>
> --
> Josh