linux-kernel - Re: [PATCH 1/1] fs/xfs remove obsolete simple

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Message-ID: <50EFB2FE.2000307@oracle.com>
Date:	Fri, 11 Jan 2013 14:36:46 +0800
From:	Jeff Liu <jeff.liu@...cle.com>
To:	Abhijit Pawar <abhi.c.pawar@...il.com>
CC:	Ben Myers <bpm@....com>, Alex Elder <elder@...nel.org>,
	linux-kernel@...r.kernel.org, xfs@....sgi.com
Subject: Re: [PATCH 1/1] fs/xfs remove obsolete simple_strto<foo>

On 01/09/2013 10:04 PM, Abhijit Pawar wrote:
> This patch replaces usages of obsolete simple_strtoul with kstrtoint in xfs_args and suffix_strtoul.
> 
> Signed-off-by: Abhijit Pawar <abhi.c.pawar@...il.com>
> ---
>  fs/xfs/xfs_super.c |   29 +++++++++++++++++++----------
>  1 files changed, 19 insertions(+), 10 deletions(-)
> 
> diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
> index ab8839b..c407121 100644
> --- a/fs/xfs/xfs_super.c
> +++ b/fs/xfs/xfs_super.c
> @@ -139,9 +139,9 @@ static const match_table_t tokens = {
>  
>  
>  STATIC unsigned long
> -suffix_strtoul(char *s, char **endp, unsigned int base)
> +suffix_kstrtoint(char *s, unsigned int base, int *res)
>  {
> -	int	last, shift_left_factor = 0;
> +	int	last, shift_left_factor = 0, _res;
>  	char	*value = s;
>  
>  	last = strlen(value) - 1;
> @@ -158,7 +158,10 @@ suffix_strtoul(char *s, char **endp, unsigned int base)
>  		value[last] = '\0';
>  	}
>  
> -	return simple_strtoul((const char *)s, endp, base) << shift_left_factor;
> +	if (kstrtoint(s, base, &_res))
> +		return -EINVAL;
> +	*res = _res << shift_left_factor;
> +	return 0;
>  }
>  
>  /*
> @@ -174,7 +177,7 @@ xfs_parseargs(
>  	char			*options)
>  {
>  	struct super_block	*sb = mp->m_super;
> -	char			*this_char, *value, *eov;
> +	char			*this_char, *value;
>  	int			dsunit = 0;
>  	int			dswidth = 0;
>  	int			iosize = 0;
> @@ -230,14 +233,16 @@ xfs_parseargs(
>  					this_char);
>  				return EINVAL;
>  			}
> -			mp->m_logbufs = simple_strtoul(value, &eov, 10);
> +			if (kstrtoint(value, 10, &mp->m_logbufs))
> +				return EINVAL;
>  		} else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) {
>  			if (!value || !*value) {
>  				xfs_warn(mp, "%s option requires an argument",
>  					this_char);
>  				return EINVAL;
>  			}
> -			mp->m_logbsize = suffix_strtoul(value, &eov, 10);
> +			if (suffix_kstrtoint(value, 10, &mp->m_logbsize))
> +				return EINVAL;
>  		} else if (!strcmp(this_char, MNTOPT_LOGDEV)) {
>  			if (!value || !*value) {
>  				xfs_warn(mp, "%s option requires an argument",
> @@ -266,7 +271,8 @@ xfs_parseargs(
>  					this_char);
>  				return EINVAL;
>  			}
> -			iosize = simple_strtoul(value, &eov, 10);
> +			if (kstrtoint(value, 10, &iosize))
> +				return EINVAL;
>  			iosizelog = ffs(iosize) - 1;
>  		} else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) {
>  			if (!value || !*value) {
> @@ -274,7 +280,8 @@ xfs_parseargs(
>  					this_char);
>  				return EINVAL;
>  			}
> -			iosize = suffix_strtoul(value, &eov, 10);
> +			if (suffix_kstrtoint(value, 10, &iosize))
> +				return EINVAL;
>  			iosizelog = ffs(iosize) - 1;
>  		} else if (!strcmp(this_char, MNTOPT_GRPID) ||
>  			   !strcmp(this_char, MNTOPT_BSDGROUPS)) {
> @@ -296,14 +303,16 @@ xfs_parseargs(
>  					this_char);
>  				return EINVAL;
>  			}
> -			dsunit = simple_strtoul(value, &eov, 10);
> +			if (kstrtoint(value, 10, &dsunit))
> +				return EINVAL;
>  		} else if (!strcmp(this_char, MNTOPT_SWIDTH)) {
>  			if (!value || !*value) {
>  				xfs_warn(mp, "%s option requires an argument",
>  					this_char);
>  				return EINVAL;
>  			}
> -			dswidth = simple_strtoul(value, &eov, 10);
> +			if (kstrtoint(value, 10, &dswidth))
> +				return EINVAL;
>  		} else if (!strcmp(this_char, MNTOPT_32BITINODE)) {
>  			mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
>  		} else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
> 
checkpatch.pl show warning if we return EINVAL as below:
WARNING: return of an errno should typically be -ve (return -EINVAL)

Can we just ignore such code style issue?

Thanks,
-Jeff
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