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 ED60C34573F for ; Mon, 1 Sep 2025 15:10:42 +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=1756739444; cv=none; b=L9WVHB96h/WSjLsmwiL1frOS7S6fGolLbEm03CartBA2ZskG9gL/LnI716hINPMNOi6g+FA9gGB3ZJjPEKE5/YEJSvHHUZXccw2/2ybRIjxwcvV+Bsp39Q62Ya6/zLgUxlV5m0MusNpguD4UqRZX3jDuIHkFr9z433MuAo4sx78= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756739444; c=relaxed/simple; bh=6gjpZOAI0cveJNUNM9Eig8c7XIa3/MpaRP2C2bTa5MU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=BL5kL5DmEfb5L2/ps0NT9XOllc79+3pD2aXS3XGeNQEN41bl/obgNCsk1udQLk2LIQtJ3qTOYxey3Vcz7KGGl0Clb26fe/D4KLMnRKs8+50jPAVKLuzjCdPX2bFiIYmFb3btj8yldzcKBs8ZixanvV8Py45/JBZ20L8R5pCM4IA= 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=NlvaKFNT; 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="NlvaKFNT" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1756739441; 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=fIzsdHZ3fBP51ER2numDMmmgvS6jLZjlCpLLEi+lFJs=; b=NlvaKFNTkc034UYI235Aw3j/FpdiwIdzLrgbFd8mf09oLb0yk0RZ1lOppjiV1leEgS++u/ GhOXwD0q/gA7yPVe3bqWAsnj/rRX71GtObSKuECrpg6IZdlH3KP7AigqUxsW1zWG7PNMiE nuKGDiVblc2Hr4YmyfLo/ObbqDV9bpU= Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-326-b49aMdn1OuiZpoH1EqfeVQ-1; Mon, 01 Sep 2025 11:10:36 -0400 X-MC-Unique: b49aMdn1OuiZpoH1EqfeVQ-1 X-Mimecast-MFC-AGG-ID: b49aMdn1OuiZpoH1EqfeVQ_1756739429 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id D9D7819560BF; Mon, 1 Sep 2025 15:10:28 +0000 (UTC) Received: from t14s.fritz.box (unknown [10.22.88.45]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 4F426180028F; Mon, 1 Sep 2025 15:10:14 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: David Hildenbrand , Marek Szyprowski , Lorenzo Stoakes , Robin Murphy , 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, Marco Elver , Michal Hocko , Mike Rapoport , Muchun Song , netdev@vger.kernel.org, Oscar Salvador , Peter Xu , Suren Baghdasaryan , Tejun Heo , virtualization@lists.linux.dev, Vlastimil Babka , wireguard@lists.zx2c4.com, x86@kernel.org, Zi Yan Subject: [PATCH v2 23/37] dma-remap: drop nth_page() in dma_common_contiguous_remap() Date: Mon, 1 Sep 2025 17:03:44 +0200 Message-ID: <20250901150359.867252-24-david@redhat.com> In-Reply-To: <20250901150359.867252-1-david@redhat.com> References: <20250901150359.867252-1-david@redhat.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 dma_common_contiguous_remap() is used to remap an "allocated contiguous region". Within a single allocation, there is no need to use nth_page() anymore. Neither the buddy, nor hugetlb, nor CMA will hand out problematic page ranges. Acked-by: Marek Szyprowski Reviewed-by: Lorenzo Stoakes Cc: Robin Murphy Signed-off-by: David Hildenbrand --- kernel/dma/remap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/dma/remap.c b/kernel/dma/remap.c index 9e2afad1c6152..b7c1c0c92d0c8 100644 --- a/kernel/dma/remap.c +++ b/kernel/dma/remap.c @@ -49,7 +49,7 @@ void *dma_common_contiguous_remap(struct page *page, size_t size, if (!pages) return NULL; for (i = 0; i < count; i++) - pages[i] = nth_page(page, i); + pages[i] = page++; vaddr = vmap(pages, count, VM_DMA_COHERENT, prot); kvfree(pages); -- 2.50.1