linux-kernel - Re: [PATCH 03/20] mm: zswap: move zswap_invalidate

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Date: Tue, 30 Jan 2024 11:38:21 +0800
From: Chengming Zhou <zhouchengming@...edance.com>
To: Johannes Weiner <hannes@...xchg.org>,
 Andrew Morton <akpm@...ux-foundation.org>
Cc: Nhat Pham <nphamcs@...il.com>, Yosry Ahmed <yosryahmed@...gle.com>,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/20] mm: zswap: move zswap_invalidate_entry() to related
 functions

On 2024/1/30 09:36, Johannes Weiner wrote:
> Move it up to the other tree and refcounting functions.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

Reviewed-by: Chengming Zhou <zhouchengming@...edance.com>

> ---
>  mm/zswap.c | 24 ++++++++++++------------
>  1 file changed, 12 insertions(+), 12 deletions(-)
> 
> diff --git a/mm/zswap.c b/mm/zswap.c
> index cf864aaa214d..9f05282efe3c 100644
> --- a/mm/zswap.c
> +++ b/mm/zswap.c
> @@ -559,6 +559,18 @@ static void zswap_entry_put(struct zswap_entry *entry)
>  	}
>  }
>  
> +/*
> + * If the entry is still valid in the tree, drop the initial ref and remove it
> + * from the tree. This function must be called with an additional ref held,
> + * otherwise it may race with another invalidation freeing the entry.
> + */
> +static void zswap_invalidate_entry(struct zswap_tree *tree,
> +				   struct zswap_entry *entry)
> +{
> +	if (zswap_rb_erase(&tree->rbroot, entry))
> +		zswap_entry_put(entry);
> +}
> +
>  /*********************************
>  * shrinker functions
>  **********************************/
> @@ -809,18 +821,6 @@ static struct zswap_pool *zswap_pool_find_get(char *type, char *compressor)
>  	return NULL;
>  }
>  
> -/*
> - * If the entry is still valid in the tree, drop the initial ref and remove it
> - * from the tree. This function must be called with an additional ref held,
> - * otherwise it may race with another invalidation freeing the entry.
> - */
> -static void zswap_invalidate_entry(struct zswap_tree *tree,
> -				   struct zswap_entry *entry)
> -{
> -	if (zswap_rb_erase(&tree->rbroot, entry))
> -		zswap_entry_put(entry);
> -}
> -
>  static enum lru_status shrink_memcg_cb(struct list_head *item, struct list_lru_one *l,
>  				       spinlock_t *lock, void *arg)
>  {