unified (weak) sys_pipe implementation

This replaces the duplicated arch-specific versions of "sys_pipe()" with
one unified implementation.  This removes almost 250 lines of duplicated
code.

It's marked __weak, so that *if* an architecture wants to override the
default implementation it can do so by simply having its own replacement
version, since many architectures use alternate calling conventions for
the 'pipe()' system call for legacy reasons (ie traditional UNIX
implementations often return the two file descriptors in registers)

I still haven't changed the cris version even though Linus says the BKL
isn't needed.  The arch maintainer can easily do it if there are really
no obstacles.

Signed-off-by: Ulrich Drepper <drepper@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 17 deletions

diff --git a/arch/s390/kernel/sys_s390.c b/arch/s390/kernel/sys_s390.c
index 988d0d64c2c8..5fdb799062b7 100644
--- a/arch/s390/kernel/sys_s390.c
+++ b/arch/s390/kernel/sys_s390.c
@@ -32,23 +32,6 @@
 #include <asm/uaccess.h>
 #include "entry.h"
 
-/*
- * sys_pipe() is the normal C calling standard for creating
- * a pipe. It's not the way Unix traditionally does this, though.
- */
-asmlinkage long sys_pipe(unsigned long __user *fildes)
-{
-	int fd[2];
-	int error;
-
-	error = do_pipe(fd);
-	if (!error) {
-		if (copy_to_user(fildes, fd, 2*sizeof(int)))
-			error = -EFAULT;
-	}
-	return error;
-}
-
 /* common code for old and new mmaps */
 static inline long do_mmap2(
 	unsigned long addr, unsigned long len,