linux-kernel - Re: [PATCH v1 24/36] ata: libata-eh: drop nth

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Message-ID: <7612fdc2-97ff-4b89-a532-90c5de56acdc@lucifer.local>
Date: Thu, 28 Aug 2025 18:53:43 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, Damien Le Moal <dlemoal@...nel.org>,
        Niklas Cassel <cassel@...nel.org>,
        Alexander Potapenko <glider@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
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        Christoph Lameter <cl@...two.org>, Dennis Zhou <dennis@...nel.org>,
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Subject: Re: [PATCH v1 24/36] ata: libata-eh: drop nth_page() usage within SG
 entry

On Thu, Aug 28, 2025 at 12:01:28AM +0200, David Hildenbrand wrote:
> It's no longer required to use nth_page() when iterating pages within a
> single SG entry, so let's drop the nth_page() usage.
>
> Cc: Damien Le Moal <dlemoal@...nel.org>
> Cc: Niklas Cassel <cassel@...nel.org>
> Signed-off-by: David Hildenbrand <david@...hat.com>

LGTM, so:

Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>

> ---
>  drivers/ata/libata-sff.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
> index 7fc407255eb46..1e2a2c33cdc80 100644
> --- a/drivers/ata/libata-sff.c
> +++ b/drivers/ata/libata-sff.c
> @@ -614,7 +614,7 @@ static void ata_pio_sector(struct ata_queued_cmd *qc)
>  	offset = qc->cursg->offset + qc->cursg_ofs;
>
>  	/* get the current page and offset */
> -	page = nth_page(page, (offset >> PAGE_SHIFT));
> +	page += offset >> PAGE_SHIFT;
>  	offset %= PAGE_SIZE;
>
>  	/* don't overrun current sg */
> @@ -631,7 +631,7 @@ static void ata_pio_sector(struct ata_queued_cmd *qc)
>  		unsigned int split_len = PAGE_SIZE - offset;
>
>  		ata_pio_xfer(qc, page, offset, split_len);
> -		ata_pio_xfer(qc, nth_page(page, 1), 0, count - split_len);
> +		ata_pio_xfer(qc, page + 1, 0, count - split_len);
>  	} else {
>  		ata_pio_xfer(qc, page, offset, count);
>  	}
> @@ -751,7 +751,7 @@ static int __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
>  	offset = sg->offset + qc->cursg_ofs;
>
>  	/* get the current page and offset */
> -	page = nth_page(page, (offset >> PAGE_SHIFT));
> +	page += offset >> PAGE_SHIFT;
>  	offset %= PAGE_SIZE;
>
>  	/* don't overrun current sg */
> --
> 2.50.1
>