From 32ae8a0669392248a92d7545a7363004543f3932 Mon Sep 17 00:00:00 2001
From: Weizhao Ouyang <o451686892@gmail.com>
Date: Fri, 23 Jul 2021 15:50:08 -0700
Subject: [PATCH] kfence: defer kfence_test_init to ensure that kunit debugfs
is created
kfence_test_init and kunit_init both use the same level late_initcall,
which means if kfence_test_init linked ahead of kunit_init,
kfence_test_init will get a NULL debugfs_rootdir as parent dentry, then
kfence_test_init and kfence_debugfs_init both create a debugfs node
named "kfence" under debugfs_mount->mnt_root, and it will throw out
"debugfs: Directory 'kfence' with parent '/' already present!" with
EEXIST. So kfence_test_init should be deferred.
Link: https://lkml.kernel.org/r/20210714113140.2949995-1-o451686892@gmail.com
Signed-off-by: Weizhao Ouyang <o451686892@gmail.com>
Tested-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
mm/kfence/kfence_test.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/kfence/kfence_test.c b/mm/kfence/kfence_test.c
index 7f24b9bcb2ec5..942cbc16ad26b 100644
--- a/mm/kfence/kfence_test.c
+++ b/mm/kfence/kfence_test.c
@@ -852,7 +852,7 @@ static void kfence_test_exit(void)
tracepoint_synchronize_unregister();
}
-late_initcall(kfence_test_init);
+late_initcall_sync(kfence_test_init);
module_exit(kfence_test_exit);
MODULE_LICENSE("GPL v2");
--
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