linux-kernel - Re: [kbuild-all] Re: mm/migrate.c:1406:5: warning: stack frame size of 2096 bytes in function 'migrate

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Date:   Wed, 2 Jun 2021 12:58:53 +0800
From:   Rong Chen <rong.a.chen@...el.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        kernel test robot <lkp@...el.com>
Cc:     Yang Shi <shy828301@...il.com>, kbuild-all@...ts.01.org,
        clang-built-linux@...glegroups.com, linux-kernel@...r.kernel.org,
        Zi Yan <ziy@...dia.com>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [kbuild-all] Re: mm/migrate.c:1406:5: warning: stack frame size
 of 2096 bytes in function 'migrate_pages'



On 6/1/21 6:14 AM, Andrew Morton wrote:
> On Sun, 30 May 2021 17:46:48 +0800 kernel test robot <lkp@...el.com> wrote:
>
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   b90e90f40b4ff23c753126008bf4713a42353af6
>> commit: dd4ae78a21fc05d91d841e499dddd057ad64a4df mm: migrate: simplify the logic for handling permanent failure
> migrate_pages() isn't a good place to be using lots of stack.
>
> Am I correct in assuming that this is a bisection result?

Hi Andrew,

I have confirmed the bisection is good.

>
> I don't immediately see why dd4ae78a21fc05d91d would be the main cause
> of this.
>

Hi Clang Team, could you share some experience about this kind of warning?

Best Regards,
Rong Chen