From 0126574fca2ce0f0d5beb9dade6efb823ff7407b Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bvanassche@acm.org>
Date: Sun, 3 Mar 2019 10:19:01 -0800
Subject: [PATCH] locking/lockdep: Only call init_rcu_head() after RCU has been
initialized
init_data_structures_once() is called for the first time before RCU has
been initialized. Make sure that init_rcu_head() is called before the
RCU head is used and after RCU has been initialized.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Cc: longman@redhat.com
Link: https://lkml.kernel.org/r/c20aa0f0-42ab-a884-d931-7d4ec2bf0cdc@acm.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/locking/lockdep.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 35a144dfddf5b..34cdcbedda492 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -982,15 +982,22 @@ static inline void check_data_structures(void) { }
*/
static void init_data_structures_once(void)
{
- static bool initialization_happened;
+ static bool ds_initialized, rcu_head_initialized;
int i;
- if (likely(initialization_happened))
+ if (likely(rcu_head_initialized))
return;
- initialization_happened = true;
+ if (system_state >= SYSTEM_SCHEDULING) {
+ init_rcu_head(&delayed_free.rcu_head);
+ rcu_head_initialized = true;
+ }
+
+ if (ds_initialized)
+ return;
+
+ ds_initialized = true;
- init_rcu_head(&delayed_free.rcu_head);
INIT_LIST_HEAD(&delayed_free.pf[0].zapped);
INIT_LIST_HEAD(&delayed_free.pf[1].zapped);
--
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