netdev - kernel/bpf/core.o: warning: objtool: ___bpf_prog_run.cold()+0x7: call without frame pointer save/setup

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Date:   Mon, 26 Aug 2019 22:42:53 +0800
From:   He Zhe <zhe.he@...driver.com>
To:     <ast@...nel.org>, <daniel@...earbox.net>, <kafai@...com>,
        <songliubraving@...com>, <yhs@...com>, <ndesaulniers@...gle.com>,
        <miguel.ojeda.sandonis@...il.com>, <luc.vanoostenryck@...il.com>,
        <schwidefsky@...ibm.com>, <gregkh@...uxfoundation.org>,
        <mst@...hat.com>, <gor@...ux.ibm.com>, <andreyknvl@...gle.com>,
        <jpoimboe@...hat.com>, <liuxiaozhou@...edance.com>,
        <yamada.masahiro@...ionext.com>, <linux-kernel@...r.kernel.org>,
        <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
        He Zhe <Zhe.He@...driver.com>
Subject: kernel/bpf/core.o: warning: objtool: ___bpf_prog_run.cold()+0x7: call
 without frame pointer save/setup

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


Zhe