From a2e05ddda11b0bd529f443df9089ab498b2c2642 Mon Sep 17 00:00:00 2001 From: Zhouyi Zhou Date: Wed, 11 Aug 2021 10:59:20 +0800 Subject: [PATCH] lockdep: Improve comments in wait-type checks Comments in wait-type checks be improved by mentioning the PREEPT_RT kernel configure option. Signed-off-by: Zhouyi Zhou Signed-off-by: Peter Zijlstra (Intel) Acked-by: Paul E. McKenney Link: https://lkml.kernel.org/r/20210811025920.20751-1-zhouzhouyi@gmail.com --- include/linux/lockdep_types.h | 2 +- kernel/locking/lockdep.c | 2 +- kernel/rcu/update.c | 4 ++-- 3 files changed, 4 insertions(+), 4 deletions(-) diff --git a/include/linux/lockdep_types.h b/include/linux/lockdep_types.h index 3e726ace5c62..d22430840b53 100644 --- a/include/linux/lockdep_types.h +++ b/include/linux/lockdep_types.h @@ -21,7 +21,7 @@ enum lockdep_wait_type { LD_WAIT_SPIN, /* spin loops, raw_spinlock_t etc.. */ #ifdef CONFIG_PROVE_RAW_LOCK_NESTING - LD_WAIT_CONFIG, /* CONFIG_PREEMPT_LOCK, spinlock_t etc.. */ + LD_WAIT_CONFIG, /* preemptible in PREEMPT_RT, spinlock_t etc.. */ #else LD_WAIT_CONFIG = LD_WAIT_SPIN, #endif diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index bfa0a347f27c..4e6312977ffb 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -4671,7 +4671,7 @@ print_lock_invalid_wait_context(struct task_struct *curr, /* * Verify the wait_type context. * - * This check validates we takes locks in the right wait-type order; that is it + * This check validates we take locks in the right wait-type order; that is it * ensures that we do not take mutexes inside spinlocks and do not attempt to * acquire spinlocks inside raw_spinlocks and the sort. * diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c index c21b38cc25e9..690b0cec7459 100644 --- a/kernel/rcu/update.c +++ b/kernel/rcu/update.c @@ -247,7 +247,7 @@ struct lockdep_map rcu_lock_map = { .name = "rcu_read_lock", .key = &rcu_lock_key, .wait_type_outer = LD_WAIT_FREE, - .wait_type_inner = LD_WAIT_CONFIG, /* XXX PREEMPT_RCU ? */ + .wait_type_inner = LD_WAIT_CONFIG, /* PREEMPT_RT implies PREEMPT_RCU */ }; EXPORT_SYMBOL_GPL(rcu_lock_map); @@ -256,7 +256,7 @@ struct lockdep_map rcu_bh_lock_map = { .name = "rcu_read_lock_bh", .key = &rcu_bh_lock_key, .wait_type_outer = LD_WAIT_FREE, - .wait_type_inner = LD_WAIT_CONFIG, /* PREEMPT_LOCK also makes BH preemptible */ + .wait_type_inner = LD_WAIT_CONFIG, /* PREEMPT_RT makes BH preemptible. */ }; EXPORT_SYMBOL_GPL(rcu_bh_lock_map);