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mm/sparse: remove section_map_size()

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section_map_size() no longer provides any shared logic.

After the sparse-vmemmap changes, its only remaining user is the
!CONFIG_SPARSEMEM_VMEMMAP path in __populate_section_memmap(), which can
compute the size inline with PAGE_ALIGN(sizeof(struct page) *
PAGES_PER_SECTION).

Remove section_map_size() and inline the remaining calculation.

Link: https://lore.kernel.org/20260910063256.64386-14-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: David Laight <david.laight.linux@gmail.com>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Qi Zheng <qi.zheng@linux.dev>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
This commit is contained in:
Muchun Song 2026-09-10 14:32:52 +08:00 committed by Andrew Morton
parent 1269621f9a
commit 7d55d0a118
2 changed files with 2 additions and 14 deletions
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1
include/linux/mm.h
View File

@ -5140,7 +5140,6 @@ static inline void print_vma_addr(char *prefix, unsigned long rip)
}
#endif
unsigned long section_map_size(void);
struct page * __populate_section_memmap(unsigned long pfn,
unsigned long nr_pages, int nid, struct vmem_altmap *altmap,
struct dev_pagemap *pgmap);

15
mm/sparse.c
View File

@ -208,23 +208,12 @@ void __init sparse_sections_init(void)
memory_present(nid, start, end);
}
#ifdef CONFIG_SPARSEMEM_VMEMMAP
unsigned long __init section_map_size(void)
{
return ALIGN(sizeof(struct page) * PAGES_PER_SECTION, PMD_SIZE);
}
#else
unsigned long __init section_map_size(void)
{
return PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION);
}
#ifndef CONFIG_SPARSEMEM_VMEMMAP
struct page __init *__populate_section_memmap(unsigned long pfn,
unsigned long nr_pages, int nid, struct vmem_altmap *altmap,
struct dev_pagemap *pgmap)
{
unsigned long size = section_map_size();
const unsigned long size = PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION);
return memmap_alloc(size, size, __pa(MAX_DMA_ADDRESS), nid, false);
}