linux-kernel - [PATCH] fs/locks: fix fcntl_getlk64/fcntl

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Date:   Tue, 23 Nov 2021 17:05:07 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Alexander Viro <viro@...iv.linux.org.uk>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>, Jeff Layton <jlayton@...nel.org>
Cc:     kernel test robot <lkp@...el.com>, Christoph Hellwig <hch@....de>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Jan Kara <jack@...e.cz>, Jens Axboe <axboe@...nel.dk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] fs/locks: fix fcntl_getlk64/fcntl_setlk64 stub prototypes

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

My patch to rework oabi fcntl64() introduced a harmless
sparse warning when file locking is disabled:

   arch/arm/kernel/sys_oabi-compat.c:251:51: sparse: sparse: incorrect type in argument 3 (different address spaces) @@     expected struct flock64 [noderef] __user *user @@     got struct flock64 * @@
   arch/arm/kernel/sys_oabi-compat.c:251:51: sparse:     expected struct flock64 [noderef] __user *user
   arch/arm/kernel/sys_oabi-compat.c:251:51: sparse:     got struct flock64 *
   arch/arm/kernel/sys_oabi-compat.c:265:55: sparse: sparse: incorrect type in argument 4 (different address spaces) @@     expected struct flock64 [noderef] __user *user @@     got struct flock64 * @@
   arch/arm/kernel/sys_oabi-compat.c:265:55: sparse:     expected struct flock64 [noderef] __user *user
   arch/arm/kernel/sys_oabi-compat.c:265:55: sparse:     got struct flock64 *

When file locking is enabled, everything works correctly and the
right data gets passed, but the stub declarations in linux/fs.h
did not get modified when the calling conventions changed in an
earlier patch.

Reported-by: kernel test robot <lkp@...el.com>
Fixes: 7e2d8c29ecdd ("ARM: 9111/1: oabi-compat: rework fcntl64() emulation")
Fixes: a75d30c77207 ("fs/locks: pass kernel struct flock to fcntl_getlk/setlk")
Cc: Christoph Hellwig <hch@....de>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 include/linux/fs.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 1cb616fc1105..698d92567841 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1220,13 +1220,13 @@ static inline int fcntl_setlk(unsigned int fd, struct file *file,
 
 #if BITS_PER_LONG == 32
 static inline int fcntl_getlk64(struct file *file, unsigned int cmd,
-				struct flock64 __user *user)
+				struct flock64 *user)
 {
 	return -EINVAL;
 }
 
 static inline int fcntl_setlk64(unsigned int fd, struct file *file,
-				unsigned int cmd, struct flock64 __user *user)
+				unsigned int cmd, struct flock64 *user)
 {
 	return -EACCES;
 }
-- 
2.29.2