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

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Message-ID: <2c416fe7-f6be-440b-b476-9fede1ea123c@windriver.com>
Date:   Tue, 27 Aug 2019 10:43:27 +0800
From:   He Zhe <zhe.he@...driver.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
CC:     <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>,
        <liuxiaozhou@...edance.com>, <yamada.masahiro@...ionext.com>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <bpf@...r.kernel.org>
Subject: Re: kernel/bpf/core.o: warning: objtool: ___bpf_prog_run.cold()+0x7:
 call without frame pointer save/setup



On 8/26/19 11:18 PM, Josh Poimboeuf wrote:
> 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
> Can you please share the following:
>
> - core.o file

Attached.

>
> The following would also be helpful for me to try to recreate it:
>
> - config file
> - compiler version
> - kernel version

I pasted them in the other reply.

Thanks,
Zhe

>


Download attachment "core.o" of type "application/x-object" (612216 bytes)