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[2003:d8:2f26:ba00:803:6ec5:9918:6fd]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-45b50dd0380sm8632985e9.10.2025.08.21.13.07.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 21 Aug 2025 13:07:45 -0700 (PDT) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: David Hildenbrand , 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 , 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 14/35] mm/mm/percpu-km: drop nth_page() usage within single allocation Date: Thu, 21 Aug 2025 22:06:40 +0200 Message-ID: <20250821200701.1329277-15-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: kz_eqzI-FeEnckcURuBCh6-sAJiAkccf_VKMO1qClCY_1755806866 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 4B3B0140005 X-Stat-Signature: 3xttc5jdxscdswb1cgnu3nj3rkfrhik5 X-Rspam-User: X-HE-Tag: 1755806870-554376 X-HE-Meta: U2FsdGVkX19E3GeYbCTN9giUWpBlBgrs8spp6lOdJtjUEnnJP+WDJC0esvXzMzPLsqsfhEgb+tr3KDG0u5B5syDIVXOXt+b9uFjESIE0VzdSWmZqFAXHCwPrrKbb2gqEm2yijVhaHUkCey7dyrD4NbPJA8sNTVgw5U5B2Jc6OjqNLmN+M/gaPKZ1N9sYWw5YIuoZzET8XPXGLMkrGzawtLIeL91thGKvwLcbngfJ/Be8gDmZSkl58+g8Pr7HDewHb9xzbf1RXMKpQTo3QYuRgco683rvxcnNvrCYEFGVSLgXn4lP2a5eZe1yjoaPRA9TxVO4pslcT2d3kM5FgBJQnmIf15pMEem/goA/n2fIJbFtgCim5xMUQ2WxnfO+sht+f2FDqGrwIZTeO6ZGhy+hupzLmYxpe/e3f0QsbI2bveCXAyKEVknQJa8LazSTJJh898khHr7pERVO8O24QdQJE6K5CX+OsKgRhKKvMSRGzCKS+eS8m8cPNvDBlLiTdIDsvTAB8Yh4+gwSv0Hj67ahs2FnPWJ4YFuHea7ESpezB55u6FIotE0nXQJ5P5T4lWqyTsQRkA0E8wOVHl7cCiJFSx89963lHaOjiir803vUBH1HqwJLS1nZKUVWM5H8xsDMqqWgjVKRXTTZgr1RGqwLLgohvwmJbZffs7Ko+XnaOdk71u9ut0HGCK49LXeQ7sjxP/z2dwdcPo1Q80YRTgDOIRpU/WjRSJGjBFlK24im+gMnY9majYQtH9oU/i32VPVJOpp/Fu+pFGSpKw775kxZ0hrtzHl7YaVDA178kbULvOyjO3zpm1IbRHZvtWujleCupu0Q94JF29VHgm4Oo0ZTEdU+fZEp9mUAcUitCzS1BcAaP74F5+N+B6Nq+edfwEMuG0EEXgjCAr3WbM/+DDsShxAVoBuma4lK5PHhh5NHNWT8vI+9fltlaS5vgI3IGWZ/Ekho5OEy2FJRsdudxLI kAvz+iAU 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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: We're allocating a higher-order page from the buddy. For these pages (that are guaranteed to not exceed a single memory section) there is no need to use nth_page(). Signed-off-by: David Hildenbrand --- mm/percpu-km.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/percpu-km.c b/mm/percpu-km.c index fe31aa19db81a..4efa74a495cb6 100644 --- a/mm/percpu-km.c +++ b/mm/percpu-km.c @@ -69,7 +69,7 @@ static struct pcpu_chunk *pcpu_create_chunk(gfp_t gfp) } for (i = 0; i < nr_pages; i++) - pcpu_set_page_chunk(nth_page(pages, i), chunk); + pcpu_set_page_chunk(pages + i, chunk); chunk->data = pages; chunk->base_addr = page_address(pages); -- 2.50.1