From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001
From: Yuval Adam <_@yuv.al>
Date: Wed, 30 Aug 2017 08:25:59 +0000
Subject: Initial file dump from open source release

---
 include/linux/pageblock-flags.h | 89 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 include/linux/pageblock-flags.h

(limited to 'include/linux/pageblock-flags.h')

diff --git a/include/linux/pageblock-flags.h b/include/linux/pageblock-flags.h
new file mode 100644
index 00000000..be655e4a
--- /dev/null
+++ b/include/linux/pageblock-flags.h
@@ -0,0 +1,89 @@
+/*
+ * Macros for manipulating and testing flags related to a
+ * pageblock_nr_pages number of pages.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation version 2 of the License
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * 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>
+
+/* Bit indices that affect a whole block of pages */
+enum pageblock_bits {
+	PB_migrate,
+	PB_migrate_end = PB_migrate + 3 - 1,
+			/* 3 bits required for migrate types */
+#ifdef CONFIG_COMPACTION
+	PB_migrate_skip,/* If set the block is skipped by compaction */
+#endif /* CONFIG_COMPACTION */
+	NR_PAGEBLOCK_BITS
+};
+
+#ifdef CONFIG_HUGETLB_PAGE
+
+#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
+
+/* Huge page sizes are variable */
+extern int pageblock_order;
+
+#else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
+
+/* Huge pages are a constant size */
+#define pageblock_order		HUGETLB_PAGE_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-1)
+
+#endif /* CONFIG_HUGETLB_PAGE */
+
+#define pageblock_nr_pages	(1UL << pageblock_order)
+
+/* Forward declaration */
+struct page;
+
+/* Declarations for getting and setting flags. See mm/page_alloc.c */
+unsigned long get_pageblock_flags_group(struct page *page,
+					int start_bitidx, int end_bitidx);
+void set_pageblock_flags_group(struct page *page, unsigned long flags,
+					int start_bitidx, int end_bitidx);
+
+#ifdef CONFIG_COMPACTION
+#define get_pageblock_skip(page) \
+			get_pageblock_flags_group(page, PB_migrate_skip,     \
+							PB_migrate_skip)
+#define clear_pageblock_skip(page) \
+			set_pageblock_flags_group(page, 0, PB_migrate_skip,  \
+							PB_migrate_skip)
+#define set_pageblock_skip(page) \
+			set_pageblock_flags_group(page, 1, PB_migrate_skip,  \
+							PB_migrate_skip)
+#endif /* CONFIG_COMPACTION */
+
+#define get_pageblock_flags(page) \
+			get_pageblock_flags_group(page, 0, PB_migrate_end)
+#define set_pageblock_flags(page, flags) \
+			set_pageblock_flags_group(page, flags,	\
+						  0, PB_migrate_end)
+
+#endif	/* PAGEBLOCK_FLAGS_H */
-- 
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