kmemleak: Allow kmemleak metadata allocations to fail

This patch adds __GFP_NORETRY and __GFP_NOMEMALLOC flags to the kmemleak
metadata allocations so that it has a smaller effect on the users of the
kernel slab allocator. Since kmemleak allocations can now fail more
often, this patch also reduces the verbosity by passing __GFP_NOWARN and
not dumping the stack trace when a kmemleak allocation fails.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Toralf Förster <toralf.foerster@gmx.de>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Ted Ts'o <tytso@mit.edu>

1 files changed, 8 insertions, 5 deletions

diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index bd9bc214091b..84225f3b7190 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -113,7 +113,9 @@
 #define BYTES_PER_POINTER       sizeof(void *)
 
 /* GFP bitmask for kmemleak internal allocations */
-#define GFP_KMEMLEAK_MASK       (GFP_KERNEL | GFP_ATOMIC)
+#define gfp_kmemleak_mask(gfp)  (((gfp) & (GFP_KERNEL | GFP_ATOMIC)) | \
+                                 __GFP_NORETRY | __GFP_NOMEMALLOC | \
+                                 __GFP_NOWARN)
 
 /* scanning area inside a memory block */
 struct kmemleak_scan_area {
@@ -511,9 +513,10 @@ static struct kmemleak_object *create_object(unsigned long ptr, size_t size,
         struct kmemleak_object *object;
         struct prio_tree_node *node;
 
-        object = kmem_cache_alloc(object_cache, gfp & GFP_KMEMLEAK_MASK);
+        object = kmem_cache_alloc(object_cache, gfp_kmemleak_mask(gfp));
         if (!object) {
-                kmemleak_stop("Cannot allocate a kmemleak_object structure\n");
+                pr_warning("Cannot allocate a kmemleak_object structure\n");
+                kmemleak_disable();
                 return NULL;
         }
 
@@ -734,9 +737,9 @@ static void add_scan_area(unsigned long ptr, size_t size, gfp_t gfp)
                 return;
         }
 
-        area = kmem_cache_alloc(scan_area_cache, gfp & GFP_KMEMLEAK_MASK);
+        area = kmem_cache_alloc(scan_area_cache, gfp_kmemleak_mask(gfp));
         if (!area) {
-                kmemleak_warn("Cannot allocate a scan area\n");
+                pr_warning("Cannot allocate a scan area\n");
                 goto out;
         }