diff mbox series

mm: add more BUILD_BUG_ONs to gfp_migratetype()

Message ID 20220726230241.3770532-1-pcc@google.com (mailing list archive)
State New
Headers show
Series mm: add more BUILD_BUG_ONs to gfp_migratetype() | expand

Commit Message

Peter Collingbourne July 26, 2022, 11:02 p.m. UTC 
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 <pcc@google.com>
---
 include/linux/gfp.h | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index f314be58fa77..ea6cb9399152 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -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;