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mm: add more BUILD_BUG_ONs to gfp_migratetype()

PATCH Applied Peter Collingbourne 1 participant 1 message Jul 26, 2022

Subsystems (3)
Memory management MM core Page allocator
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Peter Collingbourne

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PATCH 1/1 mm: add more BUILD_BUG_ONs to gfp_migratetype()

gfp_migratetype() also expects GFP_RECLAIMABLE and GFP_MOVABLE|GFP_RECLAIMABLE to be shiftable into MIGRATE_* enum values, so add some more BUILD_BUG_ONs to reflect this assumption.

Link https://linux-review.googlesource.com/id/Iae64e2182f75c3aca776a486b71a72571d66d83e
Signed-off-by Peter Collingbourne <[email protected]>
---
 include/linux/gfp.h | 3 +++
 1 file changed, 3 insertions(+)
include/linux/gfp.h +3 -0
index f314be58fa77..ea6cb9399152 100644
@@ -18,6 +18,9 @@ static inline int gfp_migratetype(const gfp_t gfp_flags)
 	VM_WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
 	BUILD_BUG_ON((1UL << GFP_MOVABLE_SHIFT) != ___GFP_MOVABLE);
 	BUILD_BUG_ON((___GFP_MOVABLE >> GFP_MOVABLE_SHIFT) != MIGRATE_MOVABLE);
+	BUILD_BUG_ON((___GFP_RECLAIMABLE >> GFP_MOVABLE_SHIFT) != MIGRATE_RECLAIMABLE);
+	BUILD_BUG_ON(((___GFP_MOVABLE | ___GFP_RECLAIMABLE) >>
+		      GFP_MOVABLE_SHIFT) != MIGRATE_HIGHATOMIC);
 
 	if (unlikely(page_group_by_mobility_disabled))
 		return MIGRATE_UNMOVABLE;
Signature · 1 line
2.37.1.455.g008518b4e5-goog