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Mon, 2 Feb 2026 10:58:57 -0500 (EST) From: Kiryl Shutsemau To: Andrew Morton , Muchun Song , David Hildenbrand , Matthew Wilcox , Usama Arif , Frank van der Linden Cc: Oscar Salvador , Mike Rapoport , Vlastimil Babka , Lorenzo Stoakes , Zi Yan , Baoquan He , Michal Hocko , Johannes Weiner , Jonathan Corbet , Huacai Chen , WANG Xuerui , Palmer Dabbelt , Paul Walmsley , Albert Ou , Alexandre Ghiti , kernel-team@meta.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, loongarch@lists.linux.dev, linux-riscv@lists.infradead.org, Kiryl Shutsemau Subject: [PATCHv6 17/17] mm/slab: Use compound_head() in page_slab() Date: Mon, 2 Feb 2026 15:56:33 +0000 Message-ID: <20260202155634.650837-18-kas@kernel.org> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20260202155634.650837-1-kas@kernel.org> References: <20260202155634.650837-1-kas@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 76E4F18000E X-Stat-Signature: mci5tofeapou488g8cnu8eaxhwytojb1 X-Rspam-User: X-HE-Tag: 1770047941-171472 X-HE-Meta: U2FsdGVkX18dd/QsQOJr/Os1XvIc+l2EPRekl47yMav3SzNJVMlKvM/19Gkm7n3Z/xeGLk2BUB2XQjQOYR51UwCzCGjz80PRc74a/eqEwIoaMEQX8F3Fuh9wHGDcJYjMREoNHYnWoStwN5mZaa7BgTh4zNM8guV9z/hnzwamQOZpkgz3Z4EwjUyKEefynJNgOe71/4xq67O675v6gGSiHzkVNucamgoD/PDVE6xGmi9eRxcWVaumJtO3kWRtjJay7K9nQBKNr9hZkwsoquGs5ANBOs5XTm2dFfmOV4MPTLKHVKEQTPJGePvPOWU3Dw302NvA77dh5egJwZtIAFn3z7mtbMnfu0ihfdcVYC26ALXj8V+P0s1vDctJwU4o32x7MKXc/fIrWKOKoKwqAYUhEXsujBAptCvmu7AloDHSYh0xQY6HDH2Mc65FDkzUgQxJO5/smAWxjyY9n3WovGPtccOVzsU7DaoYmaqTbyL6EpQul20luFETjDx8DGbEIl6sfeJYHneFCcZmA6WgYaI7P5B+PsiOpQ8MxmIvi8IpZs4AVXiZTVc99bBOFsbtuuDmb2DrR/RkDP5J+a0cuRHD0lUgv5peExn1YNwa1swS4KW0vIrb+7Q3ehn5PAP7sZRM51cF3qFIn0bUQV8KrDjLZlnHR3njnY9iSWDqzXR9EGFJjmnnKlURbVCsHZvylwLix6NSG3ylKDk7P8j4BFc5Kr75AX+FEMkPm7xQUTUkBVCujWrmF2ZeVLp3iTgCMjjP2okbjhGwY9NeP7xdZj2lFIYyQVR1zyM0CazXWr9HlkdCojL72bpovPrwASQk77Nhrj1MPYsQkaDZHui+M14GNqI8SWXSTFdxxYe040pfrFrHWfe0aYYdv46hHA9XMSSyscKqapxMs+lzJ35RZW1yGrsS7IeGk1A/qv9yzRxNuK9Ql9fpdMMZ+LcSOPuXpb20ESafntu/BdYeBwoE3/+ WE3hO7yK InAaCMlQaFWgCbV4hE5ZRAnjO/PvBIm8E/CX0r+y4O0CPJfo/n4zkCAoSiqaTl1x5wLHicRr2TvDR/1suf2sUHEhScWwJ76L3geklKOukp7gkJQLeY57R5UE9Mlsc8zW57cjR0wjIzhQn1yIMa+l31ZEvCcMFkt3siwj36XtvuT8QmgQwGY/g5c6vYi4hbLAJSDazoetmvnZAwmM9ohD4nLixuKfcWRtxkQ6flh3V+MLHdYmj7C0ll+hN+KEGdgMl1Nrrzs5BnWgibZbYw6wVtyBWC2ldv0UnICIBMPn/IMVC36FPiTZXG7zm2A== 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: page_slab() contained an open-coded implementation of compound_head(). Replace the duplicated code with a direct call to compound_head(). Signed-off-by: Kiryl Shutsemau --- I am not sure if this open-coded version is intentional and required for memdesc transition. Drop the patch if it is. --- mm/slab.h | 14 +------------- 1 file changed, 1 insertion(+), 13 deletions(-) diff --git a/mm/slab.h b/mm/slab.h index f68c3ac8126f..970a13ac5b8e 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -137,19 +137,7 @@ static_assert(IS_ALIGNED(offsetof(struct slab, freelist), sizeof(struct freelist */ static inline struct slab *page_slab(const struct page *page) { - unsigned long info; - - info = READ_ONCE(page->compound_info); - if (info & 1) { - /* See compound_head() */ - if (compound_info_has_mask()) { - unsigned long p = (unsigned long)page; - page = (struct page *)(p & info); - } else { - page = (struct page *)(info - 1); - } - } - + page = compound_head(page); if (data_race(page->page_type >> 24) != PGTY_slab) page = NULL; -- 2.51.2