Quelle bootmem_info.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_BOOTMEM_INFO_H
#define __LINUX_BOOTMEM_INFO_H

#include <linux/mm.h>
#include <linux/kmemleak.h>

/*
* Types for free bootmem stored in the low bits of page->private.
*/
enum bootmem_type {
MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 1,
SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
MIX_SECTION_INFO,
NODE_INFO,
MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
};

#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
void register_page_bootmem_memmap(unsigned long section_nr, struct page *map,
      unsigned long nr_pages);

void get_page_bootmem(unsigned long info, struct page *page,
  enum bootmem_type type);
void put_page_bootmem(struct page *page);

static inline enum bootmem_type bootmem_type(const struct page *page)
{
return (unsigned long)page->private & 0xf;
}

static inline unsigned long bootmem_info(const struct page *page)
{
return (unsigned long)page->private >> 4;
}

/*
* Any memory allocated via the memblock allocator and not via the
* buddy will be marked reserved already in the memmap. For those
* pages, we can call this function to free it to buddy allocator.
*/
static inline void free_bootmem_page(struct page *page)
{
enum bootmem_type type = bootmem_type(page);

/*
* The reserve_bootmem_region sets the reserved flag on bootmem
* pages.
*/
VM_BUG_ON_PAGE(page_ref_count(page) != 2, page);

if (type == SECTION_INFO || type == MIX_SECTION_INFO)
  put_page_bootmem(page);
else
  VM_BUG_ON_PAGE(1, page);
}
#else
static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
{
}

static inline void register_page_bootmem_memmap(unsigned long section_nr,
  struct page *map, unsigned long nr_pages)
{
}

static inline void put_page_bootmem(struct page *page)
{
}

static inline enum bootmem_type bootmem_type(const struct page *page)
{
return SECTION_INFO;
}

static inline unsigned long bootmem_info(const struct page *page)
{
return 0;
}

static inline void get_page_bootmem(unsigned long info, struct page *page,
        enum bootmem_type type)
{
}

static inline void free_bootmem_page(struct page *page)
{
kmemleak_free_part_phys(PFN_PHYS(page_to_pfn(page)), PAGE_SIZE);
free_reserved_page(page);
}
#endif

#endif /* __LINUX_BOOTMEM_INFO_H */

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