linux-kernel - Re: [PATCH v3] mm/memcontrol: use kstrtobool for swapaccount param parsing

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Date:   Mon, 19 Sep 2022 17:01:16 +0200
From:   Michal Hocko <mhocko@...e.com>
To:     Liu Shixin <liushixin2@...wei.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>,
        Johannes Weiner <hannes@...xchg.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <songmuchun@...edance.com>,
        cgroups@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: Re: [PATCH v3] mm/memcontrol: use kstrtobool for swapaccount param
 parsing

On Tue 13-09-22 15:13:58, Liu Shixin wrote:
> Use kstrtobool which is more powerful to handle all kinds of parameters
> like 'Yy1Nn0' or [oO][NnFf] for "on" and "off".

the main usefulness is with the code reusability of library functions
rather than ad-hoc stuff.

> Signed-off-by: Liu Shixin <liushixin2@...wei.com>

Acked-by: Michal Hocko <mhocko@...e.com>

Thanks!
> ---
>  mm/memcontrol.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 0a1a8a846870..5511c0c120d9 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -7434,10 +7434,10 @@ bool mem_cgroup_swap_full(struct folio *folio)
>  
>  static int __init setup_swap_account(char *s)
>  {
> -	if (!strcmp(s, "1"))
> -		cgroup_memory_noswap = false;
> -	else if (!strcmp(s, "0"))
> -		cgroup_memory_noswap = true;
> +	bool res;
> +
> +	if (!kstrtobool(s, &res))
> +		cgroup_memory_noswap = !res;
>  	return 1;
>  }
>  __setup("swapaccount=", setup_swap_account);
> -- 
> 2.25.1

-- 
Michal Hocko
SUSE Labs