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hc

2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/include/linux/page_ext.h
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@@ -17,9 +17,15 @@
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 #ifdef CONFIG_PAGE_EXTENSION
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 enum page_ext_flags {
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-	PAGE_EXT_DEBUG_GUARD,
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 	PAGE_EXT_OWNER,
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-#if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT)
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+	PAGE_EXT_OWNER_ALLOCATED,
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+#if defined(CONFIG_PAGE_PINNER)
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+	/* page refcount was increased by GUP or follow_page(FOLL_GET) */
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+	PAGE_EXT_GET,
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+	/* page migration failed */
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+	PAGE_EXT_PINNER_MIGRATION_FAILED,
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+#endif
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+#if defined(CONFIG_PAGE_IDLE_FLAG) && !defined(CONFIG_64BIT)
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 	PAGE_EXT_YOUNG,
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 	PAGE_EXT_IDLE,
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 #endif
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@@ -36,6 +42,7 @@
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 	unsigned long flags;
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 };
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+extern unsigned long page_ext_size;
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 extern void pgdat_page_ext_init(struct pglist_data *pgdat);
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 #ifdef CONFIG_SPARSEMEM
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@@ -43,14 +50,26 @@
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 {
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 }
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 extern void page_ext_init(void);
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+static inline void page_ext_init_flatmem_late(void)
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+{
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+}
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 #else
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 extern void page_ext_init_flatmem(void);
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+extern void page_ext_init_flatmem_late(void);
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 static inline void page_ext_init(void)
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 {
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 }
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 #endif
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-
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 struct page_ext *lookup_page_ext(const struct page *page);
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+extern struct page_ext *page_ext_get(struct page *page);
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+extern void page_ext_put(struct page_ext *page_ext);
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+
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+static inline struct page_ext *page_ext_next(struct page_ext *curr)
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+{
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+	void *next = curr;
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+	next += page_ext_size;
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+	return next;
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+}
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 #else /* !CONFIG_PAGE_EXTENSION */
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 struct page_ext;
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@@ -59,17 +78,25 @@
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 {
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 }
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-static inline struct page_ext *lookup_page_ext(const struct page *page)
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-{
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-	return NULL;
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-}
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-
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 static inline void page_ext_init(void)
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 {
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 }
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+static inline void page_ext_init_flatmem_late(void)
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+{
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+}
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+
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 static inline void page_ext_init_flatmem(void)
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 {
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 }
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+
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+static inline struct page_ext *page_ext_get(struct page *page)
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+{
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+	return NULL;
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+}
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+
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+static inline void page_ext_put(struct page_ext *page_ext)
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+{
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+}
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 #endif /* CONFIG_PAGE_EXTENSION */
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 #endif /* __LINUX_PAGE_EXT_H */