Commit-ID: 0126574fca2ce0f0d5beb9dade6efb823ff7407b Gitweb: https://git.kernel.org/tip/0126574fca2ce0f0d5beb9dade6efb823ff7407b Author: Bart Van Assche <bvanass...@acm.org> AuthorDate: Sun, 3 Mar 2019 10:19:01 -0800 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Sat, 9 Mar 2019 14:15:51 +0100
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 <bvanass...@acm.org> Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Andy Lutomirski <l...@kernel.org> Cc: Borislav Petkov <b...@alien8.de> Cc: Dave Hansen <dave.han...@linux.intel.com> Cc: H. Peter Anvin <h...@zytor.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Paul E. McKenney <paul...@linux.vnet.ibm.com> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Rik van Riel <r...@surriel.com> Cc: Thomas Gleixner <t...@linutronix.de> Cc: Will Deacon <will.dea...@arm.com> Cc: long...@redhat.com Link: https://lkml.kernel.org/r/c20aa0f0-42ab-a884-d931-7d4ec2bf0...@acm.org Signed-off-by: Ingo Molnar <mi...@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 35a144dfddf5..34cdcbedda49 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);
