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

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Date:   Mon, 17 Apr 2023 19:29:55 -0700
From:   Mark Fasheh <mark@...heh.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Joel Becker <jlbec@...lplan.org>,
        Joseph Qi <joseph.qi@...ux.alibaba.com>,
        Arnd Bergmann <arnd@...db.de>, David Sterba <dsterba@...e.com>,
        Christoph Böhmwalder 
        <christoph.boehmwalder@...bit.com>, Jens Axboe <axboe@...nel.dk>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Jan Höppner <hoeppner@...ux.ibm.com>,
        Christian Brauner <brauner@...nel.org>,
        ocfs2-devel@....oracle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ocfs2: reduce ioctl stack usage

On Mon, Apr 17, 2023 at 1:56 PM Arnd Bergmann <arnd@...nel.org> 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.

Thanks for this,

Reviewed-by: Mark Fasheh <mark@...heh.com>
  --Mark