linux-kernel - Re: [PATCH] ocfs2: reduce ioctl stack usage

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Date:   Tue, 18 Apr 2023 17:37:06 +0800
From:   Joseph Qi <joseph.qi@...ux.alibaba.com>
To:     Christian Brauner <brauner@...nel.org>,
        Mark Fasheh <mark@...heh.com>,
        Joel Becker <jlbec@...lplan.org>,
        Arnd Bergmann <arnd@...nel.org>,
        akpm <akpm@...ux-foundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        ocfs2-devel <ocfs2-devel@....oracle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ocfs2: reduce ioctl stack usage

Andrew picked ocfs2 patches into -mm tree before.

Thanks,
Joseph

On 4/18/23 5:17 PM, Christian Brauner wrote:
> 
> On Mon, 17 Apr 2023 22:56:24 +0200, Arnd Bergmann wrote:
>> On 32-bit architectures with KASAN_STACK enabled, the total stack usage
>> of the ocfs2_ioctl function grows beyond the warning limit:
>>
>> fs/ocfs2/ioctl.c: In function 'ocfs2_ioctl':
>> fs/ocfs2/ioctl.c:934:1: error: the frame size of 1448 bytes is larger than 1400 bytes [-Werror=frame-larger-than=]
>>
>> Move each of the variables into a basic block, and mark ocfs2_info_handle()
>> as noinline_for_stack, in order to have the variable share stack slots.
>>
>> [...]
> 
> Going by git log, ocfs2 patches don't go through a separate tree.
> So unless there are objections I'm taking this through fs.misc,
> 
> tree: git://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping.git
> branch: fs.misc
> [1/1] ocfs2: reduce ioctl stack usage
>       commit: 85ef56bc2d65215f43ceb7377ca14a779468928d
> 
> Christian