Commit 0a216dd1 authored by Dominik Brodowski's avatar Dominik Brodowski
Browse files

fs: add do_pipe2() helper; remove internal call to sys_pipe2() 

Using this helper removes an in-kernel call to the sys_pipe2() 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 2dae0248

fs/pipe.c

+7 −2
Original line number Diff line number Diff line
@@ -841,7 +841,7 @@ int do_pipe_flags(int *fd, int flags) 
 * sys_pipe() is the normal C calling standard for creating

 * a pipe. It's not the way Unix traditionally does this, though.

 */

SYSCALL_DEFINE2(pipe2, int __user *, fildes, int, flags)

static int do_pipe2(int __user *fildes, int flags)

{

	struct file *files[2];

	int fd[2];
@@ -863,9 +863,14 @@ SYSCALL_DEFINE2(pipe2, int __user *, fildes, int, flags) 
	return error;

}



SYSCALL_DEFINE2(pipe2, int __user *, fildes, int, flags)

{

	return do_pipe2(fildes, flags);

}



SYSCALL_DEFINE1(pipe, int __user *, fildes)

{

	return sys_pipe2(fildes, 0);

	return do_pipe2(fildes, 0);

}



static int wait_for_partner(struct pipe_inode_info *pipe, unsigned int *cnt)