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

Commit 016c13daa5c9 ("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 0aaa29a56e4f ("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: 016c13daa5c9 ("mm, page_alloc: use masks and shifts when converting GFP flags to migrate types")
Fixes: 0aaa29a56e4f ("mm, page_alloc: reserve pageblocks for high-order atomic allocations on demand")
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 3 insertions, 2 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 17a3c66639a9..9d666df5ef95 100644
--- a/mm/page_alloc.c
+++ b/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
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 879a2be23325..2ec34342a87b 100644
--- a/mm/vmstat.c
+++ b/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",