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Fri, 27 Feb 2026 14:43:38 -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 Subject: [PATCHv7 18/18] mm/slab: Use compound_head() in page_slab() Date: Fri, 27 Feb 2026 19:42:56 +0000 Message-ID: <20260227194302.274384-19-kas@kernel.org> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20260227194302.274384-1-kas@kernel.org> References: <20260227194302.274384-1-kas@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 25E28100002 X-Stat-Signature: nq4u4wwtbwpm3frz9zn7n8jhrrrwpc5j X-Rspam-User: X-HE-Tag: 1772221420-516941 X-HE-Meta: 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 EtoAOYP9 MlVsece4zvzFtvlOkM2rTK3nrW02POqemzTMOhla60bW+EVRoSakGpUr3NzS6N3n2th2UUHMyQldZyU80thDew5x3f6cS+6uj7oRjyyfqHEVbQAngYEWYYDatl5ai1bhFya7omvHLlsFhmwzFHHSCBpsmWkkYo6cPf+ROt+B1UPCouY4CHvfm8O7sufuuSnSdFnN51co6It8WISL1Ek2EWwlYyc8/4LfXA436cd0IPOK4RQPk37GDi+F/v/Akl9khbn9o4QV1JvJsv8J/ILbQumqv9ipe8nwfr46wC9Rpmgq/ydTNlw2H0fYzTQ== 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