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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* sparse.h:
*
* mm/ internal sparse and sparse-vmemmap declarations
*/
#ifndef __MM_SPARSE_H
#define __MM_SPARSE_H
#include <linux/mmzone.h>
/*
* mm/sparse.c
*/
#ifdef CONFIG_SPARSEMEM
void sparse_init(void);
int sparse_index_init(unsigned long section_nr, int nid);
static inline void sparse_init_one_section(struct mem_section *ms,
unsigned long pnum, struct page *mem_map,
struct mem_section_usage *usage, unsigned long flags)
{
unsigned long coded_mem_map;
BUILD_BUG_ON(SECTION_MAP_LAST_BIT > PFN_SECTION_SHIFT);
/*
* We encode the start PFN of the section into the mem_map such that
* page_to_pfn() on !CONFIG_SPARSEMEM_VMEMMAP can simply subtract it
* from the page pointer to obtain the PFN.
*/
coded_mem_map = (unsigned long)(mem_map - section_nr_to_pfn(pnum));
VM_WARN_ON_ONCE(coded_mem_map & ~SECTION_MAP_MASK);
ms->section_mem_map &= ~SECTION_MAP_MASK;
ms->section_mem_map |= coded_mem_map;
ms->section_mem_map |= flags | SECTION_HAS_MEM_MAP;
ms->usage = usage;
}
static inline void __section_mark_present(struct mem_section *ms,
unsigned long section_nr)
{
if (section_nr > __highest_present_section_nr)
__highest_present_section_nr = section_nr;
ms->section_mem_map |= SECTION_MARKED_PRESENT;
}
#else
static inline void sparse_init(void) {}
#endif /* CONFIG_SPARSEMEM */
/*
* mm/sparse-vmemmap.c
*/
#ifdef CONFIG_SPARSEMEM_VMEMMAP
void sparse_init_subsection_map(void);
#else
static inline void sparse_init_subsection_map(void) {}
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
#endif /* __MM_SPARSE_H */
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