Release 4.16 include/linux/page_ext.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_PAGE_EXT_H

#define __LINUX_PAGE_EXT_H

#include <linux/types.h>
#include <linux/stacktrace.h>
#include <linux/stackdepot.h>

struct pglist_data;

struct page_ext_operations {
	
size_t offset;
	
size_t size;
	
bool (*need)(void);
	
void (*init)(void);
};

#ifdef CONFIG_PAGE_EXTENSION

/*
 * page_ext->flags bits:
 *
 * PAGE_EXT_DEBUG_POISON is set for poisoned pages. This is used to
 * implement generic debug pagealloc feature. The pages are filled with
 * poison patterns and set this flag after free_pages(). The poisoned
 * pages are verified whether the patterns are not corrupted and clear
 * the flag before alloc_pages().
 */


enum page_ext_flags {
	
PAGE_EXT_DEBUG_POISON,		/* Page is poisoned */
	
PAGE_EXT_DEBUG_GUARD,
	
PAGE_EXT_OWNER,
#if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT)
	
PAGE_EXT_YOUNG,
	
PAGE_EXT_IDLE,
#endif
};

/*
 * Page Extension can be considered as an extended mem_map.
 * A page_ext page is associated with every page descriptor. The
 * page_ext helps us add more information about the page.
 * All page_ext are allocated at boot or memory hotplug event,
 * then the page_ext for pfn always exists.
 */

struct page_ext {
	
unsigned long flags;
};

extern void pgdat_page_ext_init(struct pglist_data *pgdat);

#ifdef CONFIG_SPARSEMEM


static inline void page_ext_init_flatmem(void)
{
}
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extern void page_ext_init(void);
#else
extern void page_ext_init_flatmem(void);


static inline void page_ext_init(void)
{
}
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#endif

struct page_ext *lookup_page_ext(struct page *page);

#else /* !CONFIG_PAGE_EXTENSION */
struct page_ext;



static inline void pgdat_page_ext_init(struct pglist_data *pgdat)
{
}

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static inline struct page_ext *lookup_page_ext(struct page *page)
{
	return NULL;
}

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static inline void page_ext_init(void)
{
}

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static inline void page_ext_init_flatmem(void)
{
}
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#endif /* CONFIG_PAGE_EXTENSION */
#endif /* __LINUX_PAGE_EXT_H */
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Directory: include/linux

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