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e73aeb8a41
mem_section_usage_size() is only needed by sparsemem implementation code
after commit ae751d567b ("mm/bootmem_info: stop marking
mem_section_usage as MIX_SECTION_INFO"), so keeping the declaration in
mmzone.h now exposes the helper to all mmzone.h users for no reason.
Move the helper to sparse.h so sparse.c and sparse-vmemmap.c can share it
through the internal header. While doing so, calculate the allocation
size with struct_size_t(), which ties the expression to the
pageblock_flags trailing array instead of open-coding the struct header
plus bitmap size.
Link: https://lore.kernel.org/20260805022536.1206575-1-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* sparse.h:
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*
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* mm/ internal sparse and sparse-vmemmap declarations
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*/
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#ifndef __MM_SPARSE_H
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#define __MM_SPARSE_H
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#include <linux/mmzone.h>
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/*
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* mm/sparse.c
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*/
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#ifdef CONFIG_SPARSEMEM
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void sparse_init(void);
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int sparse_index_init(unsigned long section_nr, int nid);
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static inline void sparse_init_one_section(struct mem_section *ms,
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unsigned long pnum, struct page *mem_map,
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struct mem_section_usage *usage, unsigned long flags)
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{
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unsigned long coded_mem_map;
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BUILD_BUG_ON(SECTION_MAP_LAST_BIT > PFN_SECTION_SHIFT);
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/*
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* We encode the start PFN of the section into the mem_map such that
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* page_to_pfn() on !CONFIG_SPARSEMEM_VMEMMAP can simply subtract it
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* from the page pointer to obtain the PFN.
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*/
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coded_mem_map = (unsigned long)(mem_map - section_nr_to_pfn(pnum));
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VM_WARN_ON_ONCE(coded_mem_map & ~SECTION_MAP_MASK);
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ms->section_mem_map &= ~SECTION_MAP_MASK;
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ms->section_mem_map |= coded_mem_map;
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ms->section_mem_map |= flags | SECTION_HAS_MEM_MAP;
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ms->usage = usage;
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}
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static inline void __section_mark_present(struct mem_section *ms,
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unsigned long section_nr)
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{
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if (section_nr > __highest_present_section_nr)
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__highest_present_section_nr = section_nr;
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ms->section_mem_map |= SECTION_MARKED_PRESENT;
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}
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static inline size_t mem_section_usage_size(void)
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{
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return struct_size_t(struct mem_section_usage, pageblock_flags,
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BITS_TO_LONGS(SECTION_BLOCKFLAGS_BITS));
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}
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#else
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static inline void sparse_init(void) {}
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#endif /* CONFIG_SPARSEMEM */
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/*
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* mm/sparse-vmemmap.c
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*/
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#ifdef CONFIG_SPARSEMEM_VMEMMAP
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void sparse_init_subsection_map(void);
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#else
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static inline void sparse_init_subsection_map(void) {}
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#endif /* CONFIG_SPARSEMEM_VMEMMAP */
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#endif /* __MM_SPARSE_H */
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