1 files changed, 98 insertions, 0 deletions
diff --git a/include/linux/pageblock-flags.h b/include/linux/pageblock-flags.h
new file mode 100644
index 000000000..e83c4c095
--- /dev/null
+++ b/include/linux/pageblock-flags.h
@@ -0,0 +1,98 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Macros for manipulating and testing flags related to a
+ * pageblock_nr_pages number of pages.
+ *
+ * Copyright (C) IBM Corporation, 2006
+ *
+ * Original author, Mel Gorman
+ * Major cleanups and reduction of bit operations, Andy Whitcroft
+ */
+#ifndef PAGEBLOCK_FLAGS_H
+#define PAGEBLOCK_FLAGS_H
+
+#include <linux/types.h>
+
+#define PB_migratetype_bits 3
+/* Bit indices that affect a whole block of pages */
+enum pageblock_bits {
+	PB_migrate,
+	PB_migrate_end = PB_migrate + PB_migratetype_bits - 1,
+			/* 3 bits required for migrate types */
+	PB_migrate_skip,/* If set the block is skipped by compaction */
+
+	/*
+	 * Assume the bits will always align on a word. If this assumption
+	 * changes then get/set pageblock needs updating.
+	 */
+	NR_PAGEBLOCK_BITS
+};
+
+#ifdef CONFIG_HUGETLB_PAGE
+
+#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
+
+/* Huge page sizes are variable */
+extern unsigned int pageblock_order;
+
+#else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
+
+/*
+ * Huge pages are a constant size, but don't exceed the maximum allocation
+ * granularity.
+ */
+#define pageblock_order		min_t(unsigned int, HUGETLB_PAGE_ORDER, MAX_ORDER)
+
+#endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
+
+#else /* CONFIG_HUGETLB_PAGE */
+
+/* If huge pages are not used, group by MAX_ORDER_NR_PAGES */
+#define pageblock_order		MAX_ORDER
+
+#endif /* CONFIG_HUGETLB_PAGE */
+
+#define pageblock_nr_pages	(1UL << pageblock_order)
+#define pageblock_align(pfn)	ALIGN((pfn), pageblock_nr_pages)
+#define pageblock_aligned(pfn)	IS_ALIGNED((pfn), pageblock_nr_pages)
+#define pageblock_start_pfn(pfn)	ALIGN_DOWN((pfn), pageblock_nr_pages)
+#define pageblock_end_pfn(pfn)		ALIGN((pfn) + 1, pageblock_nr_pages)
+
+/* Forward declaration */
+struct page;
+
+unsigned long get_pfnblock_flags_mask(const struct page *page,
+				unsigned long pfn,
+				unsigned long mask);
+
+void set_pfnblock_flags_mask(struct page *page,
+				unsigned long flags,
+				unsigned long pfn,
+				unsigned long mask);
+
+/* Declarations for getting and setting flags. See mm/page_alloc.c */
+#ifdef CONFIG_COMPACTION
+#define get_pageblock_skip(page) \
+	get_pfnblock_flags_mask(page, page_to_pfn(page),	\
+			(1 << (PB_migrate_skip)))
+#define clear_pageblock_skip(page) \
+	set_pfnblock_flags_mask(page, 0, page_to_pfn(page),	\
+			(1 << PB_migrate_skip))
+#define set_pageblock_skip(page) \
+	set_pfnblock_flags_mask(page, (1 << PB_migrate_skip),	\
+			page_to_pfn(page),			\
+			(1 << PB_migrate_skip))
+#else
+static inline bool get_pageblock_skip(struct page *page)
+{
+	return false;
+}
+static inline void clear_pageblock_skip(struct page *page)
+{
+}
+static inline void set_pageblock_skip(struct page *page)
+{
+}
+#endif /* CONFIG_COMPACTION */
+
+#endif	/* PAGEBLOCK_FLAGS_H */