linux-kernel - Re: [PATCH] Use existing helper to convert "on/off" to boolean

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Date:	Fri, 29 Apr 2016 10:04:30 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Minfei Huang <mnghuan@...il.com>
Cc:	akpm@...ux-foundation.org, labbott@...oraproject.org,
	rjw@...ysocki.net, mgorman@...hsingularity.net, vbabka@...e.cz,
	rientjes@...gle.com, kirill.shutemov@...ux.intel.com,
	iamjoonsoo.kim@....com, izumi.taku@...fujitsu.com,
	alexander.h.duyck@...hat.com, hannes@...xchg.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Use existing helper to convert "on/off" to boolean

On Fri 29-04-16 13:47:04, Minfei Huang wrote:
> It's more convenient to use existing function helper to convert string
> "on/off" to boolean.

But kstrtobool in linux-next only does "This routine returns 0 iff the
first character is one of 'Yy1Nn0'" so it doesn't know about on/off.
Or am I missing anything?

> 
> Signed-off-by: Minfei Huang <mnghuan@...il.com>
> ---
>  lib/kstrtox.c    | 2 +-
>  mm/page_alloc.c  | 9 +--------
>  mm/page_poison.c | 8 +-------
>  3 files changed, 3 insertions(+), 16 deletions(-)
> 
> diff --git a/lib/kstrtox.c b/lib/kstrtox.c
> index d8a5cf6..3c66fc4 100644
> --- a/lib/kstrtox.c
> +++ b/lib/kstrtox.c
> @@ -326,7 +326,7 @@ EXPORT_SYMBOL(kstrtos8);
>   * @s: input string
>   * @res: result
>   *
> - * This routine returns 0 iff the first character is one of 'Yy1Nn0', or
> + * This routine returns 0 if the first character is one of 'Yy1Nn0', or
>   * [oO][NnFf] for "on" and "off". Otherwise it will return -EINVAL.  Value
>   * pointed to by res is updated upon finding a match.
>   */
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 59de90d..d31426d 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -513,14 +513,7 @@ static int __init early_debug_pagealloc(char *buf)
>  {
>  	if (!buf)
>  		return -EINVAL;
> -
> -	if (strcmp(buf, "on") == 0)
> -		_debug_pagealloc_enabled = true;
> -
> -	if (strcmp(buf, "off") == 0)
> -		_debug_pagealloc_enabled = false;
> -
> -	return 0;
> +	return kstrtobool(buf, &_debug_pagealloc_enabled);
>  }
>  early_param("debug_pagealloc", early_debug_pagealloc);
>  
> diff --git a/mm/page_poison.c b/mm/page_poison.c
> index 479e7ea..1eae5fa 100644
> --- a/mm/page_poison.c
> +++ b/mm/page_poison.c
> @@ -13,13 +13,7 @@ static int early_page_poison_param(char *buf)
>  {
>  	if (!buf)
>  		return -EINVAL;
> -
> -	if (strcmp(buf, "on") == 0)
> -		want_page_poisoning = true;
> -	else if (strcmp(buf, "off") == 0)
> -		want_page_poisoning = false;
> -
> -	return 0;
> +	return strtobool(buf, &want_page_poisoning);
>  }
>  early_param("page_poison", early_page_poison_param);
>  
> -- 
> 2.6.3
> 

-- 
Michal Hocko
SUSE Labs