From: Wen Yang <wenyang.linux@foxmail.com>
Date: Wed, 10 Jan 2024 15:47:40 +0000 (+0800)
Subject: eventfd: add a BUILD_BUG_ON() to ensure consistency between EFD_SEMAPHORE and the... 
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=6b6ec4ca4e33d797f887cb2d7ecf365b652b338c;p=linux.git

eventfd: add a BUILD_BUG_ON() to ensure consistency between EFD_SEMAPHORE and the uapi

introduce a BUILD_BUG_ON to check that the EFD_SEMAPHORE is equal to its
definition in the uapi file, just like EFD_CLOEXEC and EFD_NONBLOCK.

Signed-off-by: Wen Yang <wenyang.linux@foxmail.com>
Link: https://lore.kernel.org/r/tencent_0BAA2DEAF9208D49987457E6583F9BE79507@qq.com
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jan Kara <jack@suse.cz>
Cc: <linux-fsdevel@vger.kernel.org>
Cc: <linux-kernel@vger.kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
---

diff --git a/fs/eventfd.c b/fs/eventfd.c
index ad8186d47ba76..0252b71099fbc 100644
--- a/fs/eventfd.c
+++ b/fs/eventfd.c
@@ -383,6 +383,7 @@ static int do_eventfd(unsigned int count, int flags)
 	/* Check the EFD_* constants for consistency.  */
 	BUILD_BUG_ON(EFD_CLOEXEC != O_CLOEXEC);
 	BUILD_BUG_ON(EFD_NONBLOCK != O_NONBLOCK);
+	BUILD_BUG_ON(EFD_SEMAPHORE != (1 << 0));
 
 	if (flags & ~EFD_FLAGS_SET)
 		return -EINVAL;