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Date:   Mon, 26 Aug 2019 17:11:29 +0200
From:   Greg KH <gregkh@linuxfoundation.org>
To:     He Zhe <zhe.he@windriver.com>
Cc:     ast@kernel.org, daniel@iogearbox.net, kafai@fb.com,
        songliubraving@fb.com, yhs@fb.com, ndesaulniers@google.com,
        miguel.ojeda.sandonis@gmail.com, luc.vanoostenryck@gmail.com,
        schwidefsky@de.ibm.com, mst@redhat.com, gor@linux.ibm.com,
        andreyknvl@google.com, jpoimboe@redhat.com,
        liuxiaozhou@bytedance.com, yamada.masahiro@socionext.com,
        linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
        bpf@vger.kernel.org
Subject: Re: kernel/bpf/core.o: warning: objtool: ___bpf_prog_run.cold()+0x7:
 call without frame pointer save/setup
Message-ID: <20190826151129.GA21679@kroah.com>
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On Mon, Aug 26, 2019 at 10:42:53PM +0800, He Zhe wrote:
> Hi All,
> 
> Since 3193c0836f20 ("bpf: Disable GCC -fgcse optimization for ___bpf_prog_run()"),
> We have got the following warning,
> kernel/bpf/core.o: warning: objtool: ___bpf_prog_run.cold()+0x7: call without frame pointer save/setup
> 
> If reverting the above commit, we will get the following warning,
> kernel/bpf/core.o: warning: objtool: ___bpf_prog_run()+0x8b9: sibling call from callable instruction with modified stack frame
> if CONFIG_RETPOLINE=n, and no warning if CONFIG_RETPOLINE=y

Do you see this same problem on 5.3-rc6?

And what version of gcc are you using?

thanks,

greg k-h