summaryrefslogtreecommitdiff
path: root/mm/kfence/core.c
diff options
context:
space:
mode:
Diffstat (limited to 'mm/kfence/core.c')
-rw-r--r--mm/kfence/core.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/mm/kfence/core.c b/mm/kfence/core.c
index 2623ff401a10..575c685aa642 100644
--- a/mm/kfence/core.c
+++ b/mm/kfence/core.c
@@ -741,6 +741,15 @@ void *__kfence_alloc(struct kmem_cache *s, size_t size, gfp_t flags)
return NULL;
/*
+ * Skip allocations from non-default zones, including DMA. We cannot
+ * guarantee that pages in the KFENCE pool will have the requested
+ * properties (e.g. reside in DMAable memory).
+ */
+ if ((flags & GFP_ZONEMASK) ||
+ (s->flags & (SLAB_CACHE_DMA | SLAB_CACHE_DMA32)))
+ return NULL;
+
+ /*
* allocation_gate only needs to become non-zero, so it doesn't make
* sense to continue writing to it and pay the associated contention
* cost, in case we have a large number of concurrent allocations.