page_alloc: bootmem limit with movablecore_map

Ensure the bootmem will not allocate memory from areas that may be
ZONE_MOVABLE.  The map info is from movablecore_map boot option.

Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Reviewed-by: Wen Congyang <wency@cn.fujitsu.com>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Tested-by: Lin Feng <linfeng@cn.fujitsu.com>
Cc: Wu Jianguo <wujianguo@huawei.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/memblock.h

@@ -42,6 +42,7 @@ struct memblock {
 
 extern struct memblock memblock;
 extern int memblock_debug;
+extern struct movablemem_map movablemem_map;
 
 #define memblock_dbg(fmt, ...) \
 	if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)

mm/memblock.c

@@ -101,6 +101,7 @@ phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
 {
 	phys_addr_t this_start, this_end, cand;
 	u64 i;
+	int curr = movablemem_map.nr_map - 1;
 
 	/* pump up @end */
 	if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
@@ -114,13 +115,28 @@ phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
 		this_start = clamp(this_start, start, end);
 		this_end = clamp(this_end, start, end);
 
-		if (this_end < size)
+restart:
+		if (this_end <= this_start || this_end < size)
 			continue;
 
+		for (; curr >= 0; curr--) {
+			if ((movablemem_map.map[curr].start_pfn << PAGE_SHIFT)
+			    < this_end)
+				break;
+		}
+
 		cand = round_down(this_end - size, align);
+		if (curr >= 0 &&
+		    cand < movablemem_map.map[curr].end_pfn << PAGE_SHIFT) {
+			this_end = movablemem_map.map[curr].start_pfn
+				   << PAGE_SHIFT;
+			goto restart;
+		}
+
 		if (cand >= this_start)
 			return cand;
 	}
+
 	return 0;
 }