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Wed, 28 Jan 2026 08:57:25 -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: [PATCHv5 17/17] mm/slab: Use compound_head() in page_slab() Date: Wed, 28 Jan 2026 13:54:58 +0000 Message-ID: <20260128135500.22121-18-kas@kernel.org> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20260128135500.22121-1-kas@kernel.org> References: <20260128135500.22121-1-kas@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam11 X-Stat-Signature: sgfue55eqardn4p3i3kqwkpb8ijs6t3k X-Rspam-User: X-Rspamd-Queue-Id: 14747100005 X-HE-Tag: 1769608649-667506 X-HE-Meta: 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 pdvUOcQO 81P5yZ6cWPbyGbJQiztFDFUx9ffZ9ji66f12BlBX08KBZ4uLRcfxH2uc7YkD+AL6Gtk6YhUks6wYP5da2zjFopVvc5gOg0dbh1ezD9hg2bO+VG9mh7VvF/GNdeRzW57mqUfB4A9K6yC1KvG0Io+3l6i7MiXLXPAgV/25mvAIMSiZEOy4pr9ruDoXooRF9oj2q5yaZlyMS/3A98AYCm+exuJOExICRUF08dtYMqDCuBNMimwnenOEIdGddwCBRTP24ilOLVzTlNgTWc+mAVo7pVDZPnFv/6ngQRBF7397juHOmvtm+JFUF13QpHw== 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