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/mn10300/kernel/sys_mn10300.c b/arch/mn10300/kernel/sys_mn10300.c
index 5f17a1ebc82..bca5a84dc72 100644
--- a/arch/mn10300/kernel/sys_mn10300.c
+++ b/arch/mn10300/kernel/sys_mn10300.c
@@ -29,23 +29,6 @@
 #define MIN_MAP_ADDR	PAGE_SIZE	/* minimum fixed mmap address */
 
 /*
- * 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;
-}
-
-/*
  * memory mapping syscall
  */
 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,