linux-kernel - Re: [PATCH] bpf: Tweak BPF jump table optimizations for objtool compatibility

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Date:   Tue, 5 May 2020 12:14:05 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org, x86@...nel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] bpf: Tweak BPF jump table optimizations for objtool
 compatibility

> 
> 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.