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hc

2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/include/linux/frontswap.h
..
..
@@ -7,6 +7,13 @@
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 #include <linux/bitops.h>
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 #include <linux/jump_label.h>
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+/*
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+ * Return code to denote that requested number of
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+ * frontswap pages are unused(moved to page cache).
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+ * Used in shmem_unuse and try_to_unuse.
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+ */
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+#define FRONTSWAP_PAGES_UNUSED	2
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+
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 struct frontswap_ops {
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 	void (*init)(unsigned); /* this swap type was just swapon'ed */
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 	int (*store)(unsigned, pgoff_t, struct page *); /* store a page */