Re: [PATCH] mm: slub: Place count_partial() outside CONFIG_SLUB_DEBUG if block

[David Rientjes <rientjes@google.com>]

On Mon, 12 May 2014, Fabio Estevam wrote:

> diff --git a/mm/slub.c b/mm/slub.c
> index 4d5002f..0a642a4 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -2127,12 +2127,6 @@ static inline int node_match(struct page *page, int node)
>  	return 1;
>  }
>  
> -#ifdef CONFIG_SLUB_DEBUG
> -static int count_free(struct page *page)
> -{
> -	return page->objects - page->inuse;
> -}
> -
>  static unsigned long count_partial(struct kmem_cache_node *n,
>  					int (*get_count)(struct page *))

This is wrong, gcc will now complain that count_partial() is unused if 
CONFIG_SYSFS is disabled.

>  {
> @@ -2147,6 +2141,12 @@ static unsigned long count_partial(struct kmem_cache_node *n,
>  	return x;
>  }
>  
> +#ifdef CONFIG_SLUB_DEBUG
> +static int count_free(struct page *page)
> +{
> +	return page->objects - page->inuse;
> +}
> +
>  static inline unsigned long node_nr_objs(struct kmem_cache_node *n)
>  {
>  	return atomic_long_read(&n->total_objects);

node_nr_objs() need only be defined when CONFIG_SLUB_DEBUG, there's no 
need for an #else variant that simply returns 0.  (CONFIG_SLABINFO 
requires CONFIG_SLUB_DEBUG.)

Please see http://marc.info/?l=linux-mm-commits&m=139992385527040 that has 
been merged into -mm which is the correct fix.

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