On Tue, May 05, 2020 at 12:14:05PM -0700, Alexei Starovoitov wrote:
> >
> > Hi,
> >
> > I see the objtool warning:
> > kernel/bpf/core.o: warning: objtool: ___bpf_prog_run()+0x33: call without
> > frame pointer save/setup
> >
> > when using:
> > gcc (SUSE Linux) 9.3.1 20200406 [revision
> > 6db837a5288ee3ca5ec504fbd5a765817e556ac2]
> >
> > with the attached config file.
>
> Thanks Randy. I reproduced it.
This problem isn't a mystery, it's caused by __attribute__((optimize)).
The only real solution is to revert
3193c0836f20 ("bpf: Disable GCC -fgcse optimization for ___bpf_prog_run()")
Once you do that (and disable retpolines) then you should see the
problem described in my other email.
--
Josh
