mm: fix swapped Movable and Reclaimable in /proc/pagetypeinfo

Commit 016c13d ("mm, page_alloc: use masks and shifts when
converting GFP flags to migrate types") has swapped MIGRATE_MOVABLE and
MIGRATE_RECLAIMABLE in the enum definition.  However, migratetype_names
wasn't updated to reflect that.

As a result, the file /proc/pagetypeinfo shows the counts for Movable as
Reclaimable and vice versa.

Additionally, commit 0aaa29a ("mm, page_alloc: reserve pageblocks
for high-order atomic allocations on demand") introduced
MIGRATE_HIGHATOMIC, but did not add a letter to distinguish it into
show_migration_types(), so it doesn't appear in the listing of free
areas during page alloc failures or oom kills.

This patch fixes both problems.  The atomic reserves will show with a
letter 'H' in the free areas listings.

Fixes: 016c13d ("mm, page_alloc: use masks and shifts when converting GFP flags to migrate types")
Fixes: 0aaa29a ("mm, page_alloc: reserve pageblocks for high-order atomic allocations on demand")
Signed-off-by: Vlastimil Babka <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

mm/page_alloc.c

@@ -3647,8 +3647,9 @@ static void show_migration_types(unsigned char type)
 {
 	static const char types[MIGRATE_TYPES] = {
 		[MIGRATE_UNMOVABLE]	= 'U',
-		[MIGRATE_RECLAIMABLE]	= 'E',
 		[MIGRATE_MOVABLE]	= 'M',
+		[MIGRATE_RECLAIMABLE]	= 'E',
+		[MIGRATE_HIGHATOMIC]	= 'H',
 #ifdef CONFIG_CMA
 		[MIGRATE_CMA]		= 'C',
 #endif

mm/vmstat.c

@@ -921,8 +921,8 @@ static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat,
 #ifdef CONFIG_PROC_FS
 static char * const migratetype_names[MIGRATE_TYPES] = {
 	"Unmovable",
-	"Reclaimable",
 	"Movable",
+	"Reclaimable",
 	"HighAtomic",
 #ifdef CONFIG_CMA
 	"CMA",