linux-kernel - Re: [PATCH] ufs: [bl]e*_add

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Message-ID: <20080219174524.GA6096@joi>
Date:	Tue, 19 Feb 2008 18:45:42 +0100
From:	Marcin Slusarz <marcin.slusarz@...il.com>
To:	Roel Kluin <12o3l@...cali.nl>,
	Evgeniy Dushistov <dushistov@...l.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ufs: [bl]e*_add_cpu conversion

On Tue, Feb 19, 2008 at 12:22:19AM +0100, Roel Kluin wrote:
> Andrew Morton wrote:
> > On Wed, 13 Feb 2008 10:41:44 +0100 Roel Kluin <12o3l@...cali.nl> wrote:
> > 
> >> you may also want these:
> >> ---
> >> [bl]e_add_cpu conversion in return
> 
> > upsets powerpc (at least):
> > 
> > fs/ufs/swab.h: In function `fs64_add':
> > fs/ufs/swab.h:47: warning: passing arg 1 of `le64_add_cpu' from incompatible pointer type
> > fs/ufs/swab.h:49: warning: passing arg 1 of `be64_add_cpu' from incompatible pointer type
> > fs/ufs/swab.h: In function `fs64_sub':
> > fs/ufs/swab.h:58: warning: passing arg 1 of `le64_add_cpu' from incompatible pointer type
> > fs/ufs/swab.h:60: warning: passing arg 1 of `be64_add_cpu' from incompatible pointer type
> 
> sorry for this. Is it correct to cast like the patch below does?
I don't think so. Their prototypes are wrong. We can:
a) remove fs64_add and fs64_sub as nobody use them
b) fix them - change second parameter do __fs64 (and convert to [bl]e64_add_cpu)

Evgeniy?

> If not (anyone) feel free to correct and send a patch yourself.
> The patch below was *not* tested
> ---
> [bl]e_add_cpu conversion in return (with cast)
> 
> Signed-off-by: Roel Kluin <12o3l@...cali.nl>
> ---
> diff --git a/fs/ufs/swab.h b/fs/ufs/swab.h
> index 1683d2b..594d6e8 100644
> --- a/fs/ufs/swab.h
> +++ b/fs/ufs/swab.h
> @@ -44,18 +44,22 @@ static __inline u32
>  fs64_add(struct super_block *sbp, u32 *n, int d)
>  {
>  	if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
> -		return *n = cpu_to_le64(le64_to_cpu(*n)+d);
> +		le64_add_cpu((__le64 *)n, d);
>  	else
> -		return *n = cpu_to_be64(be64_to_cpu(*n)+d);
> +		be64_add_cpu((__le64 *)n, d);
> +
> +	return *n;
>  }
>  
>  static __inline u32
>  fs64_sub(struct super_block *sbp, u32 *n, int d)
>  {
>  	if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
> -		return *n = cpu_to_le64(le64_to_cpu(*n)-d);
> +		le64_add_cpu((__le64 *)n, -d);
>  	else
> -		return *n = cpu_to_be64(be64_to_cpu(*n)-d);
> +		be64_add_cpu((__le64 *)n, -d);
> +
> +	return *n;
>  }
>  
>  static __inline u32
--
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