linux-kernel - Re: [PATCH v1 27/36] memstick: drop nth

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Message-ID: <b86e6769-18e1-4bb5-b9b3-cd11a72e3f2e@lucifer.local>
Date: Thu, 28 Aug 2025 18:57:37 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>,
        Maxim Levitsky <maximlevitsky@...il.com>, Alex Dubov <oakad@...oo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Brendan Jackman <jackmanb@...gle.com>,
        Christoph Lameter <cl@...two.org>, Dennis Zhou <dennis@...nel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>, dri-devel@...ts.freedesktop.org,
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        wireguard@...ts.zx2c4.com, x86@...nel.org, Zi Yan <ziy@...dia.com>
Subject: Re: [PATCH v1 27/36] memstick: drop nth_page() usage within SG entry

On Thu, Aug 28, 2025 at 12:01:31AM +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.
>
> Acked-by: Ulf Hansson <ulf.hansson@...aro.org>
> Cc: Maxim Levitsky <maximlevitsky@...il.com>
> Cc: Alex Dubov <oakad@...oo.com>
> Cc: Ulf Hansson <ulf.hansson@...aro.org>
> Signed-off-by: David Hildenbrand <david@...hat.com>

LGTM, so:

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

> ---
>  drivers/memstick/host/jmb38x_ms.c | 3 +--
>  drivers/memstick/host/tifm_ms.c   | 3 +--
>  2 files changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/memstick/host/jmb38x_ms.c b/drivers/memstick/host/jmb38x_ms.c
> index cddddb3a5a27f..79e66e30417c1 100644
> --- a/drivers/memstick/host/jmb38x_ms.c
> +++ b/drivers/memstick/host/jmb38x_ms.c
> @@ -317,8 +317,7 @@ static int jmb38x_ms_transfer_data(struct jmb38x_ms_host *host)
>  		unsigned int p_off;
>
>  		if (host->req->long_data) {
> -			pg = nth_page(sg_page(&host->req->sg),
> -				      off >> PAGE_SHIFT);
> +			pg = sg_page(&host->req->sg) + (off >> PAGE_SHIFT);
>  			p_off = offset_in_page(off);
>  			p_cnt = PAGE_SIZE - p_off;
>  			p_cnt = min(p_cnt, length);
> diff --git a/drivers/memstick/host/tifm_ms.c b/drivers/memstick/host/tifm_ms.c
> index db7f3a088fb09..0b6a90661eee5 100644
> --- a/drivers/memstick/host/tifm_ms.c
> +++ b/drivers/memstick/host/tifm_ms.c
> @@ -201,8 +201,7 @@ static unsigned int tifm_ms_transfer_data(struct tifm_ms *host)
>  		unsigned int p_off;
>
>  		if (host->req->long_data) {
> -			pg = nth_page(sg_page(&host->req->sg),
> -				      off >> PAGE_SHIFT);
> +			pg = sg_page(&host->req->sg) + (off >> PAGE_SHIFT);
>  			p_off = offset_in_page(off);
>  			p_cnt = PAGE_SIZE - p_off;
>  			p_cnt = min(p_cnt, length);
> --
> 2.50.1
>