linux-kernel - Re: [PATCH] tty: tty_io: remove hung_up_tty

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Message-ID: <6dca757e-74ac-773d-2a50-4e48b2f56880@I-love.SAKURA.ne.jp>
Date:   Sat, 29 Apr 2023 01:41:02 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Jiri Slaby <jirislaby@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+b7c3ba8cdc2f6cf83c21@...kaller.appspotmail.com>,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH] tty: tty_io: remove hung_up_tty_fops

On 2023/04/29 1:27, Nathan Chancellor wrote:
> I see this change has shown up in -next as commit 4c87e9e5479b ("tty:
> tty_io: remove hung_up_tty_fops"), where it causes the following warning
> for configurations without CONFIG_COMPAT (I used ARCH=arm defconfig):
> 
>   drivers/tty/tty_io.c:446:13: warning: 'hung_up_tty_compat_ioctl' defined but not used [-Wunused-function]
>     446 | static long hung_up_tty_compat_ioctl(struct file *file,
>         |             ^~~~~~~~~~~~~~~~~~~~~~~~
> 
> I am not sure if you just added that patch for additional test coverage
> or for final acceptance but the following diff resolves this warning for
> me, perhaps it can be folded in for a v2?

Thank you for reporting. Yes, moving the definition will solve the warning.

I'm testing this patch using my volatile tree before getting merged to a
permanent tree.