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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-08-07 05:43:02 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-10-08 01:02:49 +0200 |
| commit | 83c2c735e78da1a0d994911f730f6e1d36c88d7a (patch) | |
| tree | 45f75af44aca5b616a34e93a1c3caf4559c4acd2 | |
| parent | rcu: Switch synchronize_sched_expedited() to IPI (diff) | |
| download | linux-83c2c735e78da1a0d994911f730f6e1d36c88d7a.tar.xz linux-83c2c735e78da1a0d994911f730f6e1d36c88d7a.zip | |
rcu: Stop silencing lockdep false positive for expedited grace periods
This reverts commit af859beaaba4 (rcu: Silence lockdep false positive
for expedited grace periods). Because synchronize_rcu_expedited()
no longer invokes synchronize_sched_expedited(), ->exp_funnel_mutex
acquisition is no longer nested, so the false positive no longer happens.
This commit therefore removes the extra lockdep data structures, as they
are no longer needed.
| -rw-r--r-- | kernel/rcu/tree.c | 17 | ||||
| -rw-r--r-- | kernel/rcu/tree.h | 8 |
2 files changed, 2 insertions, 23 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index a42168911941..15b19baaade5 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -71,7 +71,6 @@ MODULE_ALIAS("rcutree"); static struct lock_class_key rcu_node_class[RCU_NUM_LVLS]; static struct lock_class_key rcu_fqs_class[RCU_NUM_LVLS]; static struct lock_class_key rcu_exp_class[RCU_NUM_LVLS]; -static struct lock_class_key rcu_exp_sched_class[RCU_NUM_LVLS]; /* * In order to export the rcu_state name to the tracing tools, it @@ -4095,7 +4094,6 @@ static void rcu_init_new_rnp(struct rcu_node *rnp_leaf) static void __init rcu_boot_init_percpu_data(int cpu, struct rcu_state *rsp) { - static struct lock_class_key rcu_exp_sched_rdp_class; unsigned long flags; struct rcu_data *rdp = per_cpu_ptr(rsp->rda, cpu); struct rcu_node *rnp = rcu_get_root(rsp); @@ -4111,10 +4109,6 @@ rcu_boot_init_percpu_data(int cpu, struct rcu_state *rsp) mutex_init(&rdp->exp_funnel_mutex); rcu_boot_init_nocb_percpu_data(rdp); raw_spin_unlock_irqrestore(&rnp->lock, flags); - if (rsp == &rcu_sched_state) - lockdep_set_class_and_name(&rdp->exp_funnel_mutex, - &rcu_exp_sched_rdp_class, - "rcu_data_exp_sched"); } /* @@ -4340,7 +4334,6 @@ static void __init rcu_init_one(struct rcu_state *rsp, static const char * const buf[] = RCU_NODE_NAME_INIT; static const char * const fqs[] = RCU_FQS_NAME_INIT; static const char * const exp[] = RCU_EXP_NAME_INIT; - static const char * const exp_sched[] = RCU_EXP_SCHED_NAME_INIT; static u8 fl_mask = 0x1; int levelcnt[RCU_NUM_LVLS]; /* # nodes in each level. */ @@ -4400,14 +4393,8 @@ static void __init rcu_init_one(struct rcu_state *rsp, INIT_LIST_HEAD(&rnp->blkd_tasks); rcu_init_one_nocb(rnp); mutex_init(&rnp->exp_funnel_mutex); - if (rsp == &rcu_sched_state) - lockdep_set_class_and_name( - &rnp->exp_funnel_mutex, - &rcu_exp_sched_class[i], exp_sched[i]); - else - lockdep_set_class_and_name( - &rnp->exp_funnel_mutex, - &rcu_exp_class[i], exp[i]); + lockdep_set_class_and_name(&rnp->exp_funnel_mutex, + &rcu_exp_class[i], exp[i]); } } diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h index 1b969cef8fe4..6f3b63b68886 100644 --- a/kernel/rcu/tree.h +++ b/kernel/rcu/tree.h @@ -70,8 +70,6 @@ # define RCU_NODE_NAME_INIT { "rcu_node_0" } # define RCU_FQS_NAME_INIT { "rcu_node_fqs_0" } # define RCU_EXP_NAME_INIT { "rcu_node_exp_0" } -# define RCU_EXP_SCHED_NAME_INIT \ - { "rcu_node_exp_sched_0" } #elif NR_CPUS <= RCU_FANOUT_2 # define RCU_NUM_LVLS 2 # define NUM_RCU_LVL_0 1 @@ -81,8 +79,6 @@ # define RCU_NODE_NAME_INIT { "rcu_node_0", "rcu_node_1" } # define RCU_FQS_NAME_INIT { "rcu_node_fqs_0", "rcu_node_fqs_1" } # define RCU_EXP_NAME_INIT { "rcu_node_exp_0", "rcu_node_exp_1" } -# define RCU_EXP_SCHED_NAME_INIT \ - { "rcu_node_exp_sched_0", "rcu_node_exp_sched_1" } #elif NR_CPUS <= RCU_FANOUT_3 # define RCU_NUM_LVLS 3 # define NUM_RCU_LVL_0 1 @@ -93,8 +89,6 @@ # define RCU_NODE_NAME_INIT { "rcu_node_0", "rcu_node_1", "rcu_node_2" } # define RCU_FQS_NAME_INIT { "rcu_node_fqs_0", "rcu_node_fqs_1", "rcu_node_fqs_2" } # define RCU_EXP_NAME_INIT { "rcu_node_exp_0", "rcu_node_exp_1", "rcu_node_exp_2" } -# define RCU_EXP_SCHED_NAME_INIT \ - { "rcu_node_exp_sched_0", "rcu_node_exp_sched_1", "rcu_node_exp_sched_2" } #elif NR_CPUS <= RCU_FANOUT_4 # define RCU_NUM_LVLS 4 # define NUM_RCU_LVL_0 1 @@ -106,8 +100,6 @@ # define RCU_NODE_NAME_INIT { "rcu_node_0", "rcu_node_1", "rcu_node_2", "rcu_node_3" } # define RCU_FQS_NAME_INIT { "rcu_node_fqs_0", "rcu_node_fqs_1", "rcu_node_fqs_2", "rcu_node_fqs_3" } # define RCU_EXP_NAME_INIT { "rcu_node_exp_0", "rcu_node_exp_1", "rcu_node_exp_2", "rcu_node_exp_3" } -# define RCU_EXP_SCHED_NAME_INIT \ - { "rcu_node_exp_sched_0", "rcu_node_exp_sched_1", "rcu_node_exp_sched_2", "rcu_node_exp_sched_3" } #else # error "CONFIG_RCU_FANOUT insufficient for NR_CPUS" #endif /* #if (NR_CPUS) <= RCU_FANOUT_1 */ |