From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C99ED1B4156; Fri, 22 Aug 2025 01:59:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755827965; cv=none; b=gOloCEIf5slDyB0nq4UiZBmIR+SZtKD80AVFfc1aKwVXZuk7Nc25/rcT0EehgxZUmLFslDIDK/Fv1swc6kXvDDQM+cQCnDSaDv5zLa3eCcV29bhiUT86c8tjzjvB5mwEg2X7/bJ9PYv6hcnDLE6nkkWfbe9ALgBCDME2OdF16ZA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755827965; c=relaxed/simple; bh=hEGBgFk9rer7lwQXMpzjj4FPsIa17LEhE/UyLSIHv80=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=c7mw/MYtK8gw5msnfyOehRtMPC8qkxC4SG+uYmQUopL000ai/rTcVLEmSODQeFN+lzRAqUQxzGUaBKqxxBtj7dN1aAQzBAV+oFg9ztcBhF07G7wniQa9/o+coSt3qaBTjwTL8UkoAgoOgDbUq9sSObT3yf35UiEDZC76BEsJlS8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fwCb0/jz; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="fwCb0/jz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F0940C4CEEB; Fri, 22 Aug 2025 01:59:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755827964; bh=hEGBgFk9rer7lwQXMpzjj4FPsIa17LEhE/UyLSIHv80=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=fwCb0/jzIQkNPwEVBU6dtHyOVey66bf/HcR/iNP6aS0AhxrgrvMe34HD6vjnkGUZf z1O8tLkMNZpr+UzcBZV9dLBbBCwOaf+NQwl5ntySvGabL1KCpUaRFv+wfDydW+poVi X5XvF2zmqSX16ZKS+hqRP+DFJCxEdKcM7wYo6L7tOqHJI3XrYsnweALvOp8+KSqJnD 2bWhxr7953gGHvjXyBJUoUfk/Lgb2omKSw1C8cEO/Qv3yAqSEKl2XaKQVhYluUWO/h UsLkNxPauxpS9RjmwleNolFzOVx4bdRBpqA+ZD7ACyej3l0Oe7T142W2dhwsBnQaC9 DSd2Q1+ARL+Zw== Message-ID: <3812ed9e-2a47-4c1c-bd69-f37768e62ad3@kernel.org> Date: Fri, 22 Aug 2025 10:59:15 +0900 Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC 24/35] ata: libata-eh: drop nth_page() usage within SG entry To: David Hildenbrand , linux-kernel@vger.kernel.org Cc: Niklas Cassel , Alexander Potapenko , Andrew Morton , Brendan Jackman , Christoph Lameter , Dennis Zhou , Dmitry Vyukov , dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, iommu@lists.linux.dev, io-uring@vger.kernel.org, Jason Gunthorpe , Jens Axboe , Johannes Weiner , John Hubbard , kasan-dev@googlegroups.com, kvm@vger.kernel.org, "Liam R. Howlett" , Linus Torvalds , linux-arm-kernel@axis.com, linux-arm-kernel@lists.infradead.org, linux-crypto@vger.kernel.org, linux-ide@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mips@vger.kernel.org, linux-mmc@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, Lorenzo Stoakes , Marco Elver , Marek Szyprowski , Michal Hocko , Mike Rapoport , Muchun Song , netdev@vger.kernel.org, Oscar Salvador , Peter Xu , Robin Murphy , Suren Baghdasaryan , Tejun Heo , virtualization@lists.linux.dev, Vlastimil Babka , wireguard@lists.zx2c4.com, x86@kernel.org, Zi Yan References: <20250821200701.1329277-1-david@redhat.com> <20250821200701.1329277-25-david@redhat.com> Content-Language: en-US From: Damien Le Moal Organization: Western Digital Research In-Reply-To: <20250821200701.1329277-25-david@redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 8/22/25 05:06, 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 > Cc: Niklas Cassel > Signed-off-by: David Hildenbrand > --- > 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..9f5d0f9f6d686 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; Shouldn't this be "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_SIZE; Same here, though this seems correct too. > offset %= PAGE_SIZE; > > /* don't overrun current sg */ -- Damien Le Moal Western Digital Research