linux-kernel - [PATCH] tty: remove duplicate hung_up_tty_compat

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Date:   Sat, 29 Apr 2023 22:34:31 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:     Arnd Bergmann <arnd@...db.de>, Petr Mladek <pmladek@...e.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] tty: remove duplicate hung_up_tty_compat_ioctl()

From: Arnd Bergmann <arnd@...db.de>

The hung_up_tty_compat_ioctl() has been identical to hung_up_tty_ioctl()
for a very long time, but now the only caller is inside of an #ifdef,
causing a harmless warning:

drivers/tty/tty_io.c:446:13: error: 'hung_up_tty_compat_ioctl' defined but not used [-Werror=unused-function]
  446 | static long hung_up_tty_compat_ioctl(struct file *file,

Avoid this by removing the function entirely and just using the native
one in its place.

Fixes: 04f378b198da ("tty: BKL pushdown")
Fixes: 4c87e9e5479b ("tty: tty_io: remove hung_up_tty_fops")
Link: https://lore.kernel.org/all/2a07bded-25e5-fd27-a2de-8b606e4d1d2c@I-love.SAKURA.ne.jp/
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
I did this patch to fix the build failure locally before I saw it
was already under discussion. Sending it anyway in case nobody
else has done a formal fix yet.
---
 drivers/tty/tty_io.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 553182753098..31d465279b6c 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -443,12 +443,6 @@ static long hung_up_tty_ioctl(struct file *file, unsigned int cmd,
 	return cmd == TIOCSPGRP ? -ENOTTY : -EIO;
 }
 
-static long hung_up_tty_compat_ioctl(struct file *file,
-				     unsigned int cmd, unsigned long arg)
-{
-	return cmd == TIOCSPGRP ? -ENOTTY : -EIO;
-}
-
 static int hung_up_tty_fasync(int fd, struct file *file, int on)
 {
 	return -ENOTTY;
@@ -2941,7 +2935,7 @@ static long tty_compat_ioctl(struct file *file, unsigned int cmd,
 	}
 
 	if (tty_hung_up_p(file))
-		return hung_up_tty_compat_ioctl(file, cmd, arg);
+		return hung_up_tty_ioctl(file, cmd, arg);
 	if (tty_paranoia_check(tty, file_inode(file), "tty_ioctl"))
 		return -EINVAL;
 
@@ -2959,7 +2953,7 @@ static long tty_compat_ioctl(struct file *file, unsigned int cmd,
 
 	ld = tty_ldisc_ref_wait(tty);
 	if (!ld)
-		return hung_up_tty_compat_ioctl(file, cmd, arg);
+		return hung_up_tty_ioctl(file, cmd, arg);
 	if (ld->ops->compat_ioctl)
 		retval = ld->ops->compat_ioctl(tty, cmd, arg);
 	if (retval == -ENOIOCTLCMD && ld->ops->ioctl)
-- 
2.39.2