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

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Message-ID: <20090722101032.GA2102@cmpxchg.org>
Date:	Wed, 22 Jul 2009 12:10:32 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Amerigo Wang <amwang@...hat.com>
Cc:	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()

[CC Chris]

On Wed, Jul 22, 2009 at 05:08:42AM -0400, Amerigo Wang wrote:
> 
> 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>
> Cc: Al Viro <viro@...iv.linux.org.uk> 
> CC: Linus Torvalds <torvalds@...ux-foundation.org>

Reviewed-by: Johannes Weiner <jw@...ix.com>

> ---
> 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)

It would have been nice to keep the spacing but that shouldn't be a
show stopper..

>  #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,

	Hannes
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