unsigned int cpuset_mems_cookie;
int reserve_flags;
- /*
- * In the slowpath, we sanity check order to avoid ever trying to
- * reclaim >= MAX_ORDER areas which will never succeed. Callers may
- * be using allocators in order of preference for an area that is
- * too large.
- */
- if (order >= MAX_ORDER) {
- WARN_ON_ONCE(!(gfp_mask & __GFP_NOWARN));
- return NULL;
- }
-
/*
* We also sanity check to catch abuse of atomic reserves being used by
* callers that are not in atomic context.
gfp_t alloc_mask; /* The gfp_t that was actually used for allocation */
struct alloc_context ac = { };
+ /*
+ * There are several places where we assume that the order value is sane
+ * so bail out early if the request is out of bound.
+ */
+ if (unlikely(order >= MAX_ORDER)) {
+ WARN_ON_ONCE(!(gfp_mask & __GFP_NOWARN));
+ return NULL;
+ }
+
gfp_mask &= gfp_allowed_mask;
alloc_mask = gfp_mask;
if (!prepare_alloc_pages(gfp_mask, order, preferred_nid, nodemask, &ac, &alloc_mask, &alloc_flags))
unsigned long size)
{
struct pglist_data *pgdat = zone->zone_pgdat;
+ int zone_idx = zone_idx(zone) + 1;
- pgdat->nr_zones = zone_idx(zone) + 1;
+ if (zone_idx > pgdat->nr_zones)
+ pgdat->nr_zones = zone_idx;
zone->zone_start_pfn = zone_start_pfn;
if (PageReserved(page))
goto unmovable;
+ /*
+ * If the zone is movable and we have ruled out all reserved
+ * pages then it should be reasonably safe to assume the rest
+ * is movable.
+ */
+ if (zone_idx(zone) == ZONE_MOVABLE)
+ continue;
+
/*
* Hugepages are not in LRU lists, but they're movable.
* We need not scan over tail pages bacause we don't