Commit 2fc96f83 authored by Dominik Brodowski's avatar Dominik Brodowski
Browse files

fs: add do_eventfd() helper; remove internal call to sys_eventfd() 

Using this helper removes an in-kernel call to the sys_eventfd() syscall.

This patch is part of a series which removes in-kernel calls to syscalls.
On this basis, the syscall entry path can be streamlined. For details, see
http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net



Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
parent 52fb6db0

fs/eventfd.c

+7 −2
Original line number Diff line number Diff line
@@ -380,7 +380,7 @@ struct eventfd_ctx *eventfd_ctx_fileget(struct file *file) 
}

EXPORT_SYMBOL_GPL(eventfd_ctx_fileget);



SYSCALL_DEFINE2(eventfd2, unsigned int, count, int, flags)

static int do_eventfd(unsigned int count, int flags)

{

	struct eventfd_ctx *ctx;

	int fd;
@@ -409,8 +409,13 @@ SYSCALL_DEFINE2(eventfd2, unsigned int, count, int, flags) 
	return fd;

}



SYSCALL_DEFINE2(eventfd2, unsigned int, count, int, flags)

{

	return do_eventfd(count, flags);

}



SYSCALL_DEFINE1(eventfd, unsigned int, count)

{

	return sys_eventfd2(count, 0);

	return do_eventfd(count, 0);

}