Commit 6b6ec4ca authored by Wen Yang's avatar Wen Yang Committed by Christian Brauner
Browse files

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: default avatarWen 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: default avatarChristian Brauner <brauner@kernel.org>
parent 6c8ac6e2

fs/eventfd.c

+1 −0
Original line number Diff line number Diff line
@@ -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;