mm/page_alloc.c: change the array-length to MIGRATE_PCPTYPES
Earlier, in commit 1dd214b8f21c ("mm: page_alloc: avoid merging non-fallbackable pageblocks with others"), migrate type MIGRATE_CMA and MIGRATE_ISOLATE are removed from fallbacks list since they are never used. Later on, in commit ("aa02d3c174ab mm/page_alloc: reduce fallbacks to (MIGRATE_PCPTYPES - 1)"), the array column size is reduced to 'MIGRATE_PCPTYPES - 1'. In fact, the array row size need be reduced to MIGRATE_PCPTYPES too since it's only covering rows of the number MIGRATE_PCPTYPES. Even though the current code has handled cases when the migratetype is CMA, HIGHATOMIC and MEMORY_ISOLATION, making the row size right is still good to avoid future error and confusion. Link: https://lkml.kernel.org/r/20240326061134.1055295-8-bhe@redhat.com Signed-off-by: Baoquan He <bhe@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Cc: "Mike Rapoport (IBM)" <rppt@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -1542,7 +1542,7 @@ struct page *__rmqueue_smallest(struct zone *zone, unsigned int order,
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*
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* The other migratetypes do not have fallbacks.
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*/
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static int fallbacks[MIGRATE_TYPES][MIGRATE_PCPTYPES - 1] = {
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static int fallbacks[MIGRATE_PCPTYPES][MIGRATE_PCPTYPES - 1] = {
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[MIGRATE_UNMOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_MOVABLE },
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[MIGRATE_MOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE },
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[MIGRATE_RECLAIMABLE] = { MIGRATE_UNMOVABLE, MIGRATE_MOVABLE },
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