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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, 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 v1 22/36] dma-remap: drop nth_page() in dma_common_contiguous_remap() Date: Thu, 28 Aug 2025 00:01:26 +0200 Message-ID: <20250827220141.262669-23-david@redhat.com> In-Reply-To: <20250827220141.262669-1-david@redhat.com> References: <20250827220141.262669-1-david@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 X-Rspamd-Server: rspam03 X-Rspam-User: X-Rspamd-Queue-Id: ADAB5A0009 X-Stat-Signature: wqofd8phhnhfw43dpnpa4obw4k6drpsj X-HE-Tag: 1756332513-842230 X-HE-Meta: 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 R69J+Mte XpXogkuKfte1T0/aXsNjoYDMsga7xBiFn0n1R7VPOHw68nK/Oa8n7EY1zBHeub93JKeqxWT0+f8C0N/Eidso02oIQc8DXDflCjUQG3/kxT0ISelSZa/+pMajHeCQ41FKcxw+aeJs8+EincClSn+wZpYYo/agAM0NnrslpFWih65kG73Ik/ptjTZdsPfm3kDVxbQ1zFY2JPYflgPVxhiN+EkdmT3vhercN0iYfjC/cgXjl3ndEDIdRWyyDK+RUKdQJZXojNe3YHL29yxRrRj0TKnqMwBUhzz2H8+q/W3tUNp4jZ8H3+cG61VDlDHMPmDOY+voFSomvdVE+/yIk30PGIW8CnGGF7YKk7Vpg5cr91aDHQruPEUbGczHng8rO01i3+bWnZnmiScdlHqWd4MTdM4BQbPunF/XWHYf39aYvdewaIInJzA7OcGg9sCbwJ2b4kcRsvFiacvgyddg= 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 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