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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: Dominik Brodowski <linux@dominikbrodowski.net>
This commit is contained in:
Dominik Brodowski 2018-03-11 11:34:28 +01:00
parent 2dae024806
commit 0a216dd1cf
1 changed files with 7 additions and 2 deletions
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9
fs/pipe.c
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@ -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)