do_pipe cleanup: drop its last user in arch/alpha/

The last user of do_pipe is in arch/alpha/, after replacing it with
do_pipe_flags, the do_pipe can be totally dropped.
Signed-off-by: NCheng Renquan <crquan@gmail.com>
Acked-by: NRichard Henderson <rth@twiddle.net>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

arch/alpha/kernel/entry.S

@@ -903,8 +903,9 @@ sys_alpha_pipe:
 	stq	$26, 0($sp)
 	.prologue 0
 
+	mov	$31, $17
 	lda	$16, 8($sp)
-	jsr	$26, do_pipe
+	jsr	$26, do_pipe_flags
 
 	ldq	$26, 0($sp)
 	bne	$0, 1f

arch/alpha/kernel/osf_sys.c

@@ -46,8 +46,6 @@
 #include <asm/hwrpb.h>
 #include <asm/processor.h>
 
-extern int do_pipe(int *);
-
 /*
  * Brk needs to return an error.  Still support Linux's brk(0) query idiom,
  * which OSF programs just shouldn't be doing.  We're still not quite

fs/pipe.c

@@ -1034,11 +1034,6 @@ int do_pipe_flags(int *fd, int flags)
 	return error;
 }
 
-int do_pipe(int *fd)
-{
-	return do_pipe_flags(fd, 0);
-}
-
 /*
  * sys_pipe() is the normal C calling standard for creating
  * a pipe. It's not the way Unix traditionally does this, though.

include/linux/fs.h

@@ -1881,7 +1881,6 @@ static inline void allow_write_access(struct file *file)
 	if (file)
 		atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
 }
-extern int do_pipe(int *);
 extern int do_pipe_flags(int *, int);
 extern struct file *create_read_pipe(struct file *f, int flags);
 extern struct file *create_write_pipe(int flags);