linux-kernel - Re: [PATCH] mm/slub: remove forced_order parameter in calculate

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Date:   Wed, 9 Mar 2022 09:55:22 +0000
From:   Hyeonggon Yoo <42.hyeyoo@...il.com>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, cl@...ux.com, penberg@...nel.org,
        rientjes@...gle.com, iamjoonsoo.kim@....com, vbabka@...e.cz,
        roman.gushchin@...ux.dev, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/slub: remove forced_order parameter in calculate_sizes

On Wed, Mar 09, 2022 at 05:20:36PM +0800, Miaohe Lin wrote:
> Since commit 32a6f409b693 ("mm, slub: remove runtime allocation order
> changes"), forced_order is always -1. Remove this unneeded parameter
> to simplify the code.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> ---
>  mm/slub.c | 11 ++++-------
>  1 file changed, 4 insertions(+), 7 deletions(-)
> 
> diff --git a/mm/slub.c b/mm/slub.c
> index 180354d7e741..7f09901ae6b2 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -4038,7 +4038,7 @@ static void set_cpu_partial(struct kmem_cache *s)
>   * calculate_sizes() determines the order and the distribution of data within
>   * a slab object.
>   */
> -static int calculate_sizes(struct kmem_cache *s, int forced_order)
> +static int calculate_sizes(struct kmem_cache *s)
>  {
>  	slab_flags_t flags = s->flags;
>  	unsigned int size = s->object_size;
> @@ -4142,10 +4142,7 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order)
>  	size = ALIGN(size, s->align);
>  	s->size = size;
>  	s->reciprocal_size = reciprocal_value(size);
> -	if (forced_order >= 0)
> -		order = forced_order;
> -	else
> -		order = calculate_order(size);
> +	order = calculate_order(size);
>  
>  	if ((int)order < 0)
>  		return 0;
> @@ -4181,7 +4178,7 @@ static int kmem_cache_open(struct kmem_cache *s, slab_flags_t flags)
>  	s->random = get_random_long();
>  #endif
>  
> -	if (!calculate_sizes(s, -1))
> +	if (!calculate_sizes(s))
>  		goto error;
>  	if (disable_higher_order_debug) {
>  		/*
> @@ -4191,7 +4188,7 @@ static int kmem_cache_open(struct kmem_cache *s, slab_flags_t flags)
>  		if (get_order(s->size) > get_order(s->object_size)) {
>  			s->flags &= ~DEBUG_METADATA_FLAGS;
>  			s->offset = 0;
> -			if (!calculate_sizes(s, -1))
> +			if (!calculate_sizes(s))
>  				goto error;
>  		}
>  	}

Looks good to me.

Reviewed-by: Hyeonggon Yoo <42.hyeyoo@...il.com>

Thanks!

> -- 
> 2.23.0

--
Thank you, You are awesome!
Hyeonggon :-)