netdev - Re: [PATCH net-next v2] net: page_pool: rename page_pool_is_last

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Message-ID: <9e55f21d-e246-45d2-bad1-b1bcde95b4e6@kernel.org>
Date: Mon, 16 Dec 2024 09:52:03 +0100
From: Jesper Dangaard Brouer <hawk@...nel.org>
To: Jakub Kicinski <kuba@...nel.org>, davem@...emloft.net
Cc: netdev@...r.kernel.org, edumazet@...gle.com, pabeni@...hat.com,
 Alexander Lobakin <aleksander.lobakin@...el.com>,
 Ilias Apalodimas <ilias.apalodimas@...aro.org>, asml.silence@...il.com,
 almasrymina@...gle.com
Subject: Re: [PATCH net-next v2] net: page_pool: rename
 page_pool_is_last_ref()



On 15/12/2024 22.29, Jakub Kicinski wrote:
> page_pool_is_last_ref() releases a reference while the name,
> to me at least, suggests it just checks if the refcount is 1.
> The semantics of the function are the same as those of
> atomic_dec_and_test() and refcount_dec_and_test(), so just
> use the _and_test() suffix.
> 
> Reviewed-by: Alexander Lobakin <aleksander.lobakin@...el.com>
> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> ---
> Hopefully this doesn't conflict with anyone's work, I've been
> deferring sending this rename forever because I always look
> at it while reviewing an in-flight series and then I'm worried
> it will conflict.
> 
> v2:
>   - rebased on Olek's changes
> v1: https://lore.kernel.org/20241213153759.3086474-1-kuba@kernel.org
> 
> CC: hawk@...nel.org
> CC: ilias.apalodimas@...aro.org
> CC: aleksander.lobakin@...el.com
> CC: asml.silence@...il.com
> CC: almasrymina@...gle.com
> ---
>   include/net/page_pool/helpers.h | 4 ++--
>   net/core/page_pool.c            | 2 +-
>   2 files changed, 3 insertions(+), 3 deletions(-)

Looks good to me.

Acked-by: Jesper Dangaard Brouer <hawk@...nel.org>



> diff --git a/include/net/page_pool/helpers.h b/include/net/page_pool/helpers.h
> index e555921e5233..776a3008ac28 100644
> --- a/include/net/page_pool/helpers.h
> +++ b/include/net/page_pool/helpers.h
> @@ -306,7 +306,7 @@ static inline void page_pool_ref_page(struct page *page)
>   	page_pool_ref_netmem(page_to_netmem(page));
>   }
>   
> -static inline bool page_pool_is_last_ref(netmem_ref netmem)
> +static inline bool page_pool_unref_and_test(netmem_ref netmem)
>   {
>   	/* If page_pool_unref_page() returns 0, we were the last user */
>   	return page_pool_unref_netmem(netmem, 1) == 0;
> @@ -321,7 +321,7 @@ static inline void page_pool_put_netmem(struct page_pool *pool,
>   	 * allow registering MEM_TYPE_PAGE_POOL, but shield linker.
>   	 */
>   #ifdef CONFIG_PAGE_POOL
> -	if (!page_pool_is_last_ref(netmem))
> +	if (!page_pool_unref_and_test(netmem))
>   		return;
>   
>   	page_pool_put_unrefed_netmem(pool, netmem, dma_sync_size, allow_direct);
> diff --git a/net/core/page_pool.c b/net/core/page_pool.c
> index e07ad7315955..9733206d6406 100644
> --- a/net/core/page_pool.c
> +++ b/net/core/page_pool.c
> @@ -897,7 +897,7 @@ void page_pool_put_netmem_bulk(netmem_ref *data, u32 count)
>   	for (u32 i = 0; i < count; i++) {
>   		netmem_ref netmem = netmem_compound_head(data[i]);
>   
> -		if (page_pool_is_last_ref(netmem))
> +		if (page_pool_unref_and_test(netmem))
>   			data[bulk_len++] = netmem;
>   	}
>