linux-kernel - Re: [PATCH 1,2/4 v4] slub: use __cmpxchg_double

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Date:	Wed, 20 Jun 2012 10:14:28 +0300 (EEST)
From:	Pekka Enberg <penberg@...nel.org>
To:	Joonsoo Kim <js1304@...il.com>
cc:	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH 1,2/4 v4] slub: use __cmpxchg_double_slab() at interrupt
 disabled place

On Fri, 18 May 2012, Joonsoo Kim wrote:

> get_freelist(), unfreeze_partials() are only called with interrupt disabled,
> so __cmpxchg_double_slab() is suitable.
> 
> Acked-by: Christoph Lameter <cl@...ux.com>
> Signed-off-by: Joonsoo Kim <js1304@...il.com>

Applied, thanks!

> ---
> According to comment from Pekka, add some comment.
> 
> diff --git a/mm/slub.c b/mm/slub.c
> index 0c3105c..d7f8291 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -1879,7 +1879,11 @@ redo:
>  	}
>  }
>  
> -/* Unfreeze all the cpu partial slabs */
> +/*
> + * Unfreeze all the cpu partial slabs.
> + *
> + * This function must be called with interrupt disabled.
> + */
>  static void unfreeze_partials(struct kmem_cache *s)
>  {
>  	struct kmem_cache_node *n = NULL;
> @@ -1935,7 +1939,7 @@ static void unfreeze_partials(struct kmem_cache *s)
>  				l = m;
>  			}
>  
> -		} while (!cmpxchg_double_slab(s, page,
> +		} while (!__cmpxchg_double_slab(s, page,
>  				old.freelist, old.counters,
>  				new.freelist, new.counters,
>  				"unfreezing slab"));
> @@ -2163,6 +2167,8 @@ static inline void *new_slab_objects(struct kmem_cache *s, gfp_t flags,
>   * The page is still frozen if the return value is not NULL.
>   *
>   * If this function returns NULL then the page has been unfrozen.
> + *
> + * This function must be called with interrupt disabled.
>   */
>  static inline void *get_freelist(struct kmem_cache *s, struct page *page)
>  {
> @@ -2179,7 +2185,7 @@ static inline void *get_freelist(struct kmem_cache *s, struct page *page)
>  		new.inuse = page->objects;
>  		new.frozen = freelist != NULL;
>  
> -	} while (!cmpxchg_double_slab(s, page,
> +	} while (!__cmpxchg_double_slab(s, page,
>  		freelist, counters,
>  		NULL, new.counters,
>  		"get_freelist"));
> -- 
> 1.7.9.5
> 
> 
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