1 files changed, 4 insertions, 1 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index 9b7d746d6d62..9ca84189cfc2 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1022,11 +1022,14 @@ void __cleanup_sighand(struct sighand_struct *sighand)
 {
         if (atomic_dec_and_test(&sighand->count)) {
                 signalfd_cleanup(sighand);
+                /*
+                 * sighand_cachep is SLAB_DESTROY_BY_RCU so we can free it
+                 * without an RCU grace period, see __lock_task_sighand().
+                 */
                 kmem_cache_free(sighand_cachep, sighand);
         }
 }
 
-
 /*
  * Initialize POSIX timer handling for a thread group.
  */