From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id F128CCA0EED for ; Fri, 22 Aug 2025 07:44:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=TYwcfR40TeWsfT3bxGe5ccvVRM+x9ilYYyOeQE763K8=; b=NH9x/O/vya9pKSRCx5lTdhNvlC oeFZktbeeT0zHacCtnO+sEbGuHbTqH+alHoJaVpPQMcbKClyIZ7TsB06bV/ju4/3n9BETjdZgjMcR 1QVDPKNkoH1IpPZluXnpIahfkVTwbd3a/cDM3LnzLerfFQW8eYi5k10SwbKxV3v3MCVHKBWpp8e8u sJQNPDYUSnp9eZ8G8zJrbc45h1MN30j7J3g9XwmCG/rJDuAbWMnAMg9kAoJbDde1Aa2igs1w2ldYO JrNJDsuaX5bcSBAgkVQGupBnvkNldDzDo9tdo+h+ZX9eSyZGWWVvEQA+5AUM9Ox4DI+epvS6Q2TSE YWwVJLyg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1upMS4-00000001qYv-2D2C; Fri, 22 Aug 2025 07:44:44 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1upH4D-00000001CQZ-0D7u; Fri, 22 Aug 2025 01:59:45 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Transfer-Encoding:Content-Type :In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date:Message-ID: Sender:Reply-To:Content-ID:Content-Description; bh=TYwcfR40TeWsfT3bxGe5ccvVRM+x9ilYYyOeQE763K8=; b=jQMvrrk8oa/S9bIuu/2SwkZ2J+ iZM44VpAwl+e05hZoJK0EL5RP9FSeKyevfp+tfOZ1CzIxUDqo20uJ79KBvLyqpkAXpNgxqzw5At6h m4Ip/9LhuY4vWd5HRYztCfz/UicQXVHmjxovc1Ffvit9zxJTBF/qSYhLPAfscTwAQi6jm3kX3wRAx 0JgbiWUSiWVbJEZqY95MSUFwIOTGqYtGNxf/OcA+a3RxUr67Jc/TaFlHBZsURXV7OjfNXDUL8wKFy y/+fS1B6WwIkEYWbXiVQpbrhIT3L/cPfU0NnW2taQu2eyygq2jmuJi2NSy/npx3/RKAak7jEetruh fuGDYNdw==; Received: from dfw.source.kernel.org ([139.178.84.217]) by desiato.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1upH44-00000000k6w-1dPq; Fri, 22 Aug 2025 01:59:41 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id BB83A5C6103; Fri, 22 Aug 2025 01:59:24 +0000 (UTC) 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 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250822_025939_214223_B5082CB5 X-CRM114-Status: GOOD ( 15.94 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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