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-rw-r--r--mm/page_alloc.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 5dac5d8cb148..85759cdd6973 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1446,9 +1446,6 @@ get_page_from_freelist(gfp_t gfp_mask, nodemask_t *nodemask, unsigned int order,
int zlc_active = 0; /* set if using zonelist_cache */
int did_zlc_setup = 0; /* just call zlc_setup() one time */
- if (WARN_ON_ONCE(order >= MAX_ORDER))
- return NULL;
-
classzone_idx = zone_idx(preferred_zone);
zonelist_scan:
/*
@@ -1707,6 +1704,15 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
struct task_struct *p = current;
/*
+ * 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 (WARN_ON_ONCE(order >= MAX_ORDER))
+ return NULL;
+
+ /*
* GFP_THISNODE (meaning __GFP_THISNODE, __GFP_NORETRY and
* __GFP_NOWARN set) should not cause reclaim since the subsystem
* (f.e. slab) using GFP_THISNODE may choose to trigger reclaim