linux-kernel - Re: [Patch 2/2] xtensa: use generic sys

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Date:	Fri, 24 Jul 2009 17:04:16 +0800
From:	Amerigo Wang <xiyou.wangcong@...il.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Amerigo Wang <amwang@...hat.com>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>, mingo@...e.hu,
	Chris Zankel <chris@...kel.net>
Subject: Re: [Patch 2/2] xtensa: use generic sys_pipe()

On Thu, Jul 23, 2009 at 01:18:34PM +0200, Johannes Weiner wrote:
>On Thu, Jul 23, 2009 at 05:47:24PM +0800, Amerigo Wang wrote:
>> Johannes Weiner wrote:



<snip>

>> >>--- a/arch/xtensa/include/asm/unistd.h
>> >>+++ b/arch/xtensa/include/asm/unistd.h
>> >>@@ -94,7 +94,7 @@ __SYSCALL( 35, sys_readlink, 3)
>> >> #define __NR_mknod 				 36
>> >> __SYSCALL( 36, sys_mknod, 3)
>> >> #define __NR_pipe 				 37
>> >>-__SYSCALL( 37, xtensa_pipe, 1)
>> >>+__SYSCALL(37, sys_pipe, 1)
>> >>    
>> >
>> >It would have been nice to keep the spacing but that shouldn't be a
>> >show stopper..
>> >
>> >  
>> 
>> I did this, but checkpatch.pl complained about this... so I removed the
>> space.
>
>Yeah, but look at the file.  checkpatch suggests alignment that is
>common for function calls, but this doesn't look like a sequence of
>function calls, rather like a table - and we align other tables (like
>fields in structure definitions) as well because you usually don't
>read them in a linear fashion but want to spot key values immediately.
>
>Please ignore checkpatch in this case.

Ok, thanks! Below is it.

--------------------------->

As suggested by Al, we can use the generic sys_pipe() instead of xtensa_pipe()
for xtensa.

Signed-off-by: WANG Cong <amwang@...hat.com>
Reviewed-by: Johannes Weiner <jw@...ix.com>
Cc: Al Viro <viro@...iv.linux.org.uk> 
CC: Linus Torvalds <torvalds@...ux-foundation.org>

---
diff --git a/arch/xtensa/include/asm/syscall.h b/arch/xtensa/include/asm/syscall.h
index 05cebf8..76a1fb8 100644
--- a/arch/xtensa/include/asm/syscall.h
+++ b/arch/xtensa/include/asm/syscall.h
@@ -12,7 +12,6 @@ struct pt_regs;
 struct sigaction;
 asmlinkage long xtensa_execve(char*, char**, char**, struct pt_regs*);
 asmlinkage long xtensa_clone(unsigned long, unsigned long, struct pt_regs*);
-asmlinkage long xtensa_pipe(int __user *);
 asmlinkage long xtensa_mmap2(unsigned long, unsigned long, unsigned long,
     			     unsigned long, unsigned long, unsigned long);
 asmlinkage long xtensa_ptrace(long, long, long, long);
diff --git a/arch/xtensa/include/asm/unistd.h b/arch/xtensa/include/asm/unistd.h
index c092c8f..b6880c8 100644
--- a/arch/xtensa/include/asm/unistd.h
+++ b/arch/xtensa/include/asm/unistd.h
@@ -94,7 +94,7 @@ __SYSCALL( 35, sys_readlink, 3)
 #define __NR_mknod 				 36
 __SYSCALL( 36, sys_mknod, 3)
 #define __NR_pipe 				 37
-__SYSCALL( 37, xtensa_pipe, 1)
+__SYSCALL( 37, sys_pipe, 1)
 #define __NR_unlink 				 38
 __SYSCALL( 38, sys_unlink, 1)
 #define __NR_rmdir 				 39
diff --git a/arch/xtensa/kernel/syscall.c b/arch/xtensa/kernel/syscall.c
index ac15ecb..c7279be 100644
--- a/arch/xtensa/kernel/syscall.c
+++ b/arch/xtensa/kernel/syscall.c
@@ -39,24 +39,6 @@ syscall_t sys_call_table[__NR_syscall_count] /* FIXME __cacheline_aligned */= {
 #include <asm/unistd.h>
 };
 
-/*
- * xtensa_pipe() is the normal C calling standard for creating a pipe. It's not
- * the way unix traditional does this, though.
- */
-
-asmlinkage long xtensa_pipe(int __user *userfds)
-{
-	int fd[2];
-	int error;
-
-	error = do_pipe_flags(fd, 0);
-	if (!error) {
-		if (copy_to_user(userfds, fd, 2 * sizeof(int)))
-			error = -EFAULT;
-	}
-	return error;
-}
-
 
 asmlinkage long xtensa_mmap2(unsigned long addr, unsigned long len,
    			     unsigned long prot, unsigned long flags,
--
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