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Fri, 27 Feb 2026 14:31:00 -0500 (EST) From: "Kiryl Shutsemau (Meta)" 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 , "David Hildenbrand (Arm)" Subject: [PATCHv7 18/18] mm/slab: Use compound_head() in page_slab() Date: Fri, 27 Feb 2026 19:30:19 +0000 Message-ID: <20260227193030.272078-18-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-Queue-Id: 1A37140015 X-Rspamd-Server: rspam07 X-Stat-Signature: nq4u4wwtbwpm3frz9zn7n8jhrrrwpc5j X-Rspam-User: X-HE-Tag: 1772220663-170526 X-HE-Meta: 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 8JiQqCm2 mHTD714wJCwDoVJ1KjvCADo0eo6POqp2+xg7c8+U88ol6C3s5F1Q2XkBZ1zfxmraKNSk67Oi24Whe1W6ht8csS2HJivMZq1xiitAlmyMiXe5Vla2izlfbwcQmvbHlUW8KnbYaTIhHlmBhJKQn4czjpSCtsnIMxAIKvEyIuSztVIYukfIXHGmaJLx5M5B5xs29nzR/4q4wphnbR1MSpuZnVotFj6CTseli8hQdRbVRGwI9Fmrs0tvQ5WlKys/WznTOFtNy4ohgNYNUCbSZcxowss8ugj+S6CObj1QQ5PRw40Dq/l889lcAKAj6kw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Kiryl Shutsemau 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 Acked-by: David Hildenbrand (Arm) Reviewed-by: Vlastimil Babka --- mm/slab.h | 14 +------------- 1 file changed, 1 insertion(+), 13 deletions(-) diff --git a/mm/slab.h b/mm/slab.h index 1a1b3758df05..7d3b929019ae 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -131,19 +131,7 @@ 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