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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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 37AA21C0016 X-Stat-Signature: rr6f34wzmzd8zn7za81pebmas3ksd3or X-HE-Tag: 1756739442-533931 X-HE-Meta: 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 0KSMZtlN 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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. 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