mm/page_alloc: remove VM_BUG_ON()s from pindex helpers

Vlastimil pointed out that the VM_BUG_ON()s have fallen out of favour, so
remove them.

Link: https://lore.kernel.org/20260526-page_alloc-unmapped-prep-v2-1-412f4d486115@google.com
Signed-off-by: Brendan Jackman <jackmanb@google.com>
Suggested-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Link: https://lore.kernel.org/all/4074a816-9e75-45a6-8141-25459bcc106b@kernel.org/
Reviewed-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 7e3c79e79e5b832998f587eda8fa7c5f32303e0f..97cb958205923eb255f2845cb497be178989deaf 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -653,13 +653,8 @@ static inline unsigned int order_to_pindex(int migratetype, int order)
        if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) {
                bool movable = migratetype == MIGRATE_MOVABLE;
 
-               if (order > PAGE_ALLOC_COSTLY_ORDER) {
-                       VM_BUG_ON(!is_pmd_order(order));
-
+               if (order > PAGE_ALLOC_COSTLY_ORDER)
                        return NR_LOWORDER_PCP_LISTS + movable;
-               }
-       } else {
-               VM_BUG_ON(order > PAGE_ALLOC_COSTLY_ORDER);
        }
 
        return (MIGRATE_PCPTYPES * order) + migratetype;
@@ -672,8 +667,6 @@ static inline int pindex_to_order(unsigned int pindex)
        if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) {
                if (pindex >= NR_LOWORDER_PCP_LISTS)
                        order = HPAGE_PMD_ORDER;
-       } else {
-               VM_BUG_ON(order > PAGE_ALLOC_COSTLY_ORDER);
        }
 
        return order;