From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 DA88B3629B3 for ; Thu, 21 Aug 2025 20:08:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755806886; cv=none; b=PVVuGN086/Mtc46mh6WTL0zYeW8Qi2XFEpTrBDcYoI2zOE9jgbmY4+84rZBgLnluIbcv1RsdZ8Vhh7nF79sN7j2SNpCaIGxpTuJKyQ2BexQm/hkX0raPL88JgG9/SHWF4OQdHFErxTtevJOjULkckxaEHfy4LwZEWZKPcVWL9mg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755806886; c=relaxed/simple; bh=E88hXeAEs+yXdxHqIfTWo/GvQIeDr+kkFObDidynu1s=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=aNjJsdr1oGu80s3L1w8zIHxwO6XwIM2x7xf6B4TOhk4kSwRwgeOkb/UGg/FPi+SEWvIGHiZtBmhabdxDaCyb2IXU98UhdAr8i9rM3Em7sHH38FKcrEeTzLxrcGRIv3j3pBJ16RkM6/U8HEiuOVZ9SN2Wzv3LD50IhEmKA5mtZMY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=glYUhfC9; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="glYUhfC9" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1755806882; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=w6VkvDa+3msZeC5nA9B9+aDln+Mg2ABReefULBX94/4=; b=glYUhfC95petK0g5XrmQqYibeCae0kE3MpZihKeJV8jNJrpscbhkHUJwNAsM28tKpbZZ/r FyLWJNJ0Ycg9t1aPfnZAxQZXYhnlMiG6xb3Y+qQtL9O0qv+NQ6inT7R4n3z6FF1nNZPcX5 PWLnz9NTz+1zXwHnT4B+1V48Ow0Poxk= Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-294-604IDmEEOXujGhLWkMkevA-1; Thu, 21 Aug 2025 16:08:01 -0400 X-MC-Unique: 604IDmEEOXujGhLWkMkevA-1 X-Mimecast-MFC-AGG-ID: 604IDmEEOXujGhLWkMkevA_1755806880 Received: by mail-wm1-f69.google.com with SMTP id 5b1f17b1804b1-45a15fd6b45so10808105e9.1 for ; Thu, 21 Aug 2025 13:08:01 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1755806880; x=1756411680; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=w6VkvDa+3msZeC5nA9B9+aDln+Mg2ABReefULBX94/4=; b=rczaB4u88wnC75DKmU20E1LatyD2V4bziczrML2t5LqGZ8yrkCY3gyVU8GP7y141yu vr/1PPtgcEANPu4dEre/3YAThmzWBB2Lqd2p4eRPy6MoX18D8lOFOKkH/DvQvlZ5uFVk uaDK8mr+O023f11atCUtcTGFMXSg2Eubh6VGj5cVap0KSrity5mwlBpfuX7SP1axro7d zB27pFlfTLJhjFQHFN7RoZyaEwacT/tY3LR39T35wU3p36wehjs4lJMO0OY09hWoDAjU 5fIsGYV90rGwSKvFGuX2gb4z70MAxT/yiIk43D+EtVEG0kbrz0YKomOFEy1BQsUIU9eh pM2w== X-Forwarded-Encrypted: i=1; AJvYcCUSUSBz+EHnJBb835QNq1OiTd1psO6inZIsqTrpqwmHgPVqJDCtYit8eGV6KP4dLO3KOV2n2K6F/jMI@vger.kernel.org X-Gm-Message-State: AOJu0Yxq77ggij2nCrv54774mXKfS0CGN/nhkCrof+QbnSZalS+4GSZr FnDN82PuHdljZfPOtXnIHbXpdcr1HxOk7PohnzDOQCI3JCZRQ3j1pM5syqysruowTNq8B84FbvV W2xp2DQ/fGMlNzwUGsorXJ/7d4LoEPpl5WK3NHlfeWvlWSCl8tMuBnOY1FC3ABq0= X-Gm-Gg: ASbGncv3N34wwrM/klzf3S85kRLGsWISnGrUmj8Ztjd8dTln3Lf08s8/P0Kf1OwQ/Q7 QgJvaMmPzFQ6ADtOypc9AsZpbr+GAQB1yisSnaIwM+T6qjfFdO+YIrhbj1eEui/P6UCaOKFpPUH LnV8e5KBotapLuWxyYQKCDH+pRZa5NE4E5O+fVgczcdV99UljxnFvLO1AW/Yhv+kvOqDlPGT268 zntlxib34XAeVbLX5e18xGIidWyp2A3s2bCNXqoYc2mDa6IOfhX1NnptTHLiyHt/LGOCN9dTyoA Sq+7NcyqPrV0lP+eS86EL2O+oE0SXN0+GmUnXzrOBl+InYCAvgo8H2vQmnHNYaAPkQmAoGFzHcH y72fStqpdSLmhviuBQbLEPw== X-Received: by 2002:a05:600c:1c87:b0:456:942:b162 with SMTP id 5b1f17b1804b1-45b51792539mr3328585e9.11.1755806880035; Thu, 21 Aug 2025 13:08:00 -0700 (PDT) X-Google-Smtp-Source: AGHT+IG9ciI0WdoI3CxhUtu7m/cESVsdReJmvmXFWCMaWsO+hhXySreox2GeOL2sJ8kVyLPwCYhbEA== X-Received: by 2002:a05:600c:1c87:b0:456:942:b162 with SMTP id 5b1f17b1804b1-45b51792539mr3328365e9.11.1755806879543; Thu, 21 Aug 2025 13:07:59 -0700 (PDT) Received: from localhost (p200300d82f26ba0008036ec5991806fd.dip0.t-ipconnect.de. [2003:d8:2f26:ba00:803:6ec5:9918:6fd]) by smtp.gmail.com with UTF8SMTPSA id ffacd0b85a97d-3c07778939bsm12219075f8f.46.2025.08.21.13.07.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 21 Aug 2025 13:07:59 -0700 (PDT) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: David Hildenbrand , Jens Axboe , 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 , 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 Subject: [PATCH RFC 19/35] io_uring/zcrx: remove nth_page() usage within folio Date: Thu, 21 Aug 2025 22:06:45 +0200 Message-ID: <20250821200701.1329277-20-david@redhat.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250821200701.1329277-1-david@redhat.com> References: <20250821200701.1329277-1-david@redhat.com> Precedence: bulk X-Mailing-List: linux-mips@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Within a folio/compound page, nth_page() is no longer required. Given that we call folio_test_partial_kmap()+kmap_local_page(), the code would already be problematic if the src_pages would span multiple folios. So let's just assume that all src pages belong to a single folio/compound page and can be iterated ordinarily. Cc: Jens Axboe Signed-off-by: David Hildenbrand --- 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 f29b2a4867516..107b2a1b31c1c 100644 --- a/io_uring/zcrx.c +++ b/io_uring/zcrx.c @@ -966,7 +966,7 @@ static ssize_t io_copy_page(struct page *dst_page, struct page *src_page, size_t n = len; if (folio_test_partial_kmap(page_folio(src_page))) { - src_page = nth_page(src_page, src_offset / PAGE_SIZE); + src_page += src_offset / PAGE_SIZE; src_offset = offset_in_page(src_offset); n = min(PAGE_SIZE - src_offset, PAGE_SIZE - dst_offset); n = min(n, len); -- 2.50.1