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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko Subject: [PATCH 08/14] mm/sparse: remove sparse_decode_mem_map() Date: Tue, 17 Mar 2026 17:56:46 +0100 Message-ID: <20260317165652.99114-9-david@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260317165652.99114-1-david@kernel.org> References: <20260317165652.99114-1-david@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 352B1100003 X-Rspamd-Server: rspam07 X-Stat-Signature: shn9rnh1k8jtqb3dx7hna9g4d7xiibox X-Rspam-User: X-HE-Tag: 1773766654-991972 X-HE-Meta: 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 I1rcLxcC geU/FPU/QBYiJRelMJHqveYW4zUImTk6XOKBn7agPl7v1k7qM+5yk5OWpJBYxvdUQd+TDb7fh/tP/Lw7oI5TzPTOOisrK3fOOovFm4xC9jSPspZ+IOI4HipFLm9/VijQ+5/vqmhIQdLRtsBOde04/sKt23GBhq2sNVHClL7FlFt22ZQOP3VKm/tZIBFYnxXRRkkHqBFyRe+nz0Hwxj1S3gSMjrfLXROZR7+ZqL1/eOgrZdVg899BwQJjMaA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: section_deactivate() applies to CONFIG_SPARSEMEM_VMEMMAP only. So we can just use pfn_to_page() (after making sure we have the start PFN of the section), and remove sparse_decode_mem_map(). Signed-off-by: David Hildenbrand (Arm) --- include/linux/memory_hotplug.h | 2 -- mm/sparse.c | 16 +--------------- 2 files changed, 1 insertion(+), 17 deletions(-) diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h index e77ef3d7ff73..815e908c4135 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -308,8 +308,6 @@ extern int sparse_add_section(int nid, unsigned long pfn, struct dev_pagemap *pgmap); extern void sparse_remove_section(unsigned long pfn, unsigned long nr_pages, struct vmem_altmap *altmap); -extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, - unsigned long pnum); extern struct zone *zone_for_pfn_range(enum mmop online_type, int nid, struct memory_group *group, unsigned long start_pfn, unsigned long nr_pages); diff --git a/mm/sparse.c b/mm/sparse.c index 636a4a0f1199..2a1f662245bc 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -274,18 +274,6 @@ static unsigned long sparse_encode_mem_map(struct page *mem_map, unsigned long p return coded_mem_map; } -#ifdef CONFIG_MEMORY_HOTPLUG -/* - * Decode mem_map from the coded memmap - */ -struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum) -{ - /* mask off the extra low bits of information */ - coded_mem_map &= SECTION_MAP_MASK; - return ((struct page *)coded_mem_map) + section_nr_to_pfn(pnum); -} -#endif /* CONFIG_MEMORY_HOTPLUG */ - static void __meminit sparse_init_one_section(struct mem_section *ms, unsigned long pnum, struct page *mem_map, struct mem_section_usage *usage, unsigned long flags) @@ -758,8 +746,6 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages, empty = is_subsection_map_empty(ms); if (empty) { - unsigned long section_nr = pfn_to_section_nr(pfn); - /* * Mark the section invalid so that valid_section() * return false. This prevents code from dereferencing @@ -778,7 +764,7 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages, kfree_rcu(ms->usage, rcu); WRITE_ONCE(ms->usage, NULL); } - memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); + memmap = pfn_to_page(SECTION_ALIGN_DOWN(pfn)); } /* -- 2.43.0