[linux-block.git] / include / linux / bootmem_info.h

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

#include <linux/mm.h>

/*
 * Types for free bootmem stored in page->lru.next. These have to be in
 * some random range in unsigned long space for debugging purposes.
 */
enum {
	MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
	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 get_page_bootmem(unsigned long info, struct page *page,
		      unsigned long type);
void put_page_bootmem(struct page *page);

/*
 * 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)
{
	unsigned long magic = page->index;

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

	if (magic == SECTION_INFO || magic == 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 put_page_bootmem(struct page *page)
{
}

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

static inline void free_bootmem_page(struct page *page)
{
	free_reserved_page(page);
}
#endif

#endif /* __LINUX_BOOTMEM_INFO_H */
Commit	Line	Data
426e5c42 MS	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	#ifndef __LINUX_BOOTMEM_INFO_H
	3	#define __LINUX_BOOTMEM_INFO_H
	4
f41f2ed4	5	#include <linux/mm.h>
426e5c42 MS	6
	7	/*
	8	* Types for free bootmem stored in page->lru.next. These have to be in
	9	* some random range in unsigned long space for debugging purposes.
	10	*/
	11	enum {
	12	MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
	13	SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
	14	MIX_SECTION_INFO,
	15	NODE_INFO,
	16	MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
	17	};
	18
	19	#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
	20	void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
	21
	22	void get_page_bootmem(unsigned long info, struct page *page,
	23	unsigned long type);
	24	void put_page_bootmem(struct page *page);
f41f2ed4 MS	25
	26	/*
	27	* Any memory allocated via the memblock allocator and not via the
	28	* buddy will be marked reserved already in the memmap. For those
	29	* pages, we can call this function to free it to buddy allocator.
	30	*/
	31	static inline void free_bootmem_page(struct page *page)
	32	{
c5e97ed1	33	unsigned long magic = page->index;
f41f2ed4 MS	34
	35	/*
	36	* The reserve_bootmem_region sets the reserved flag on bootmem
	37	* pages.
	38	*/
	39	VM_BUG_ON_PAGE(page_ref_count(page) != 2, page);
	40
	41	if (magic == SECTION_INFO \|\| magic == MIX_SECTION_INFO)
	42	put_page_bootmem(page);
	43	else
	44	VM_BUG_ON_PAGE(1, page);
	45	}
426e5c42 MS	46	#else
	47	static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
	48	{
	49	}
	50
	51	static inline void put_page_bootmem(struct page *page)
	52	{
	53	}
	54
	55	static inline void get_page_bootmem(unsigned long info, struct page *page,
	56	unsigned long type)
	57	{
	58	}
f41f2ed4 MS	59
	60	static inline void free_bootmem_page(struct page *page)
	61	{
	62	free_reserved_page(page);
	63	}
426e5c42 MS	64	#endif
	65
	66	#endif /* __LINUX_BOOTMEM_INFO_H */