linux-kernel - Re: [PATCH] io_uring/zcrx: use folio_nr

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Message-ID: <584d69ee-512a-4940-8348-d67f8b57fce1@gmail.com>
Date: Tue, 7 Oct 2025 12:13:46 +0100
From: Pavel Begunkov <asml.silence@...il.com>
To: Pedro Demarchi Gomes <pedrodemargomes@...il.com>,
 Jens Axboe <axboe@...nel.dk>
Cc: io-uring@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] io_uring/zcrx: use folio_nr_pages() instead of shift
 operation

On 10/4/25 04:07, Pedro Demarchi Gomes wrote:
> folio_nr_pages() is a faster helper function to get the number of pages when
> NR_PAGES_IN_LARGE_FOLIO is enabled.

Looks straightforward, I'll take it into a branch.

> Signed-off-by: Pedro Demarchi Gomes <pedrodemargomes@...il.com>
> ---
>   io_uring/zcrx.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c
> index e5ff49f3425e..97fda3d65919 100644
> --- a/io_uring/zcrx.c
> +++ b/io_uring/zcrx.c
> @@ -172,7 +172,7 @@ static unsigned long io_count_account_pages(struct page **pages, unsigned nr_pag
>   		if (folio == last_folio)
>   			continue;
>   		last_folio = folio;
> -		res += 1UL << folio_order(folio);
> +		res += folio_nr_pages(folio);
>   	}
>   	return res;
>   }

-- 
Pavel Begunkov