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[2003:d8:2f26:ba00:803:6ec5:9918:6fd]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-45b4e2790a8sm21120815e9.1.2025.08.21.13.08.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 21 Aug 2025 13:08:07 -0700 (PDT) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: David Hildenbrand , Marek Szyprowski , 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, Lorenzo Stoakes , 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 RFC 22/35] dma-remap: drop nth_page() in dma_common_contiguous_remap() Date: Thu, 21 Aug 2025 22:06:48 +0200 Message-ID: <20250821200701.1329277-23-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> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: uTXfHdOeWBmEwkMbsglMRMxxetkOklVZa1sbK9C0NIw_1755806889 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true X-HE-Meta: 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 F8G9YpLU U2yXtGyRCM4RF2wDHHvkZjE9GVF4X6IAONaFVdNoVl5kjm9i5DDyp5sNJHKgBMmvK6onoBeJxxu3aCqaIn01TnBwvQwpI7QyHMamoFH06QuyYbgzfcyG0HL+XyVMbP/iymf98UcCEkbR/zdIhyG5gSnvaAorzMckxLQ67IZIO3xN1P/6br4DnyVDDwDYOBw9JLxsl0I9I/ACpexY//MrH3Z6FkMe/j4cAqZcC X-Rspamd-Queue-Id: CA590C000A X-Stat-Signature: d3xz48gdm5d4eg3ebrhgymtr8xnocbt7 X-HE-Tag-Orig: 1755806891-764480 X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1755806894-492222 X-HE-Meta: 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 qByEKY6u 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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. Cc: Marek Szyprowski 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