linux-kernel - Re: [PATCH] mm:Make the function set_recommended_min_free

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Date:	Thu, 2 Jul 2015 09:23:02 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Nicholas Krause <xerofoify@...il.com>
Cc:	akpm@...ux-foundation.org, kirill.shutemov@...ux.intel.com,
	mgorman@...e.de, rientjes@...gle.com, vbabka@...e.cz,
	aneesh.kumar@...ux.vnet.ibm.com, ebru.akagunduz@...il.com,
	hannes@...xchg.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm:Make the function set_recommended_min_free_kbytes
 have a return type of void

On Wed 01-07-15 13:45:15, Nicholas Krause wrote:
> This makes the function set_recommended_min_free_kbytes have a
> return type of void now due to this particular function never
> needing to signal it's call if it fails due to this function
> always completing successfully without issue.

The changelog is hard to read for me.
"
The function cannot possibly fail so it doesn't make much sense to have
a return value. Make it void.
"
Would sound much easier to parse for me.

I doubt this would help the compiler to generate a better code but in
general it is better to have void return type when there is no failure
possible - which is the case here.

> Signed-off-by: Nicholas Krause <xerofoify@...il.com>

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

> ---
>  mm/huge_memory.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index c107094..914a72a 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -104,7 +104,7 @@ static struct khugepaged_scan khugepaged_scan = {
>  };
>  
>  
> -static int set_recommended_min_free_kbytes(void)
> +static void set_recommended_min_free_kbytes(void)
>  {
>  	struct zone *zone;
>  	int nr_zones = 0;
> @@ -139,7 +139,6 @@ static int set_recommended_min_free_kbytes(void)
>  		min_free_kbytes = recommended_min;
>  	}
>  	setup_per_zone_wmarks();
> -	return 0;
>  }
>  
>  static int start_stop_khugepaged(void)
> -- 
> 2.1.4
> 

-- 
Michal Hocko
SUSE Labs
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