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| author | Paul E. McKenney <paulmck@linux.ibm.com> | 2019-05-21 17:28:41 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.ibm.com> | 2019-08-13 23:35:49 +0200 |
| commit | c035280f1761b3336f4dad336906c19735d7ba5f (patch) | |
| tree | 85ad343275c09506e944585ea78b5f4056aa3d9f /kernel/rcu | |
| parent | rcu/nocb: Remove obsolete nocb_head and nocb_tail fields (diff) | |
| download | linux-c035280f1761b3336f4dad336906c19735d7ba5f.tar.xz linux-c035280f1761b3336f4dad336906c19735d7ba5f.zip | |
rcu/nocb: Remove obsolete nocb_q_count and nocb_q_count_lazy fields
This commit removes the obsolete nocb_q_count and nocb_q_count_lazy
fields, also removing rcu_get_n_cbs_nocb_cpu(), adjusting
rcu_get_n_cbs_cpu(), and making rcutree_migrate_callbacks() once again
disable the ->cblist fields of offline CPUs.
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree.c | 6 | ||||
| -rw-r--r-- | kernel/rcu/tree.h | 3 | ||||
| -rw-r--r-- | kernel/rcu/tree_plugin.h | 14 |
3 files changed, 3 insertions, 20 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 054418d2d960..e5f30b364276 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -210,10 +210,9 @@ static long rcu_get_n_cbs_cpu(int cpu) { struct rcu_data *rdp = per_cpu_ptr(&rcu_data, cpu); - if (rcu_segcblist_is_enabled(&rdp->cblist) && - !rcu_segcblist_is_offloaded(&rdp->cblist)) /* Online normal CPU? */ + if (rcu_segcblist_is_enabled(&rdp->cblist)) return rcu_segcblist_n_cbs(&rdp->cblist); - return rcu_get_n_cbs_nocb_cpu(rdp); /* Works for offline, too. */ + return 0; } void rcu_softirq_qs(void) @@ -3181,6 +3180,7 @@ void rcutree_migrate_callbacks(int cpu) needwake = rcu_advance_cbs(my_rnp, rdp) || rcu_advance_cbs(my_rnp, my_rdp); rcu_segcblist_merge(&my_rdp->cblist, &rdp->cblist); + rcu_segcblist_disable(&rdp->cblist); WARN_ON_ONCE(rcu_segcblist_empty(&my_rdp->cblist) != !rcu_segcblist_n_cbs(&my_rdp->cblist)); if (rcu_segcblist_is_offloaded(&my_rdp->cblist)) { diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h index 74e3a4ab8095..d1df192272fb 100644 --- a/kernel/rcu/tree.h +++ b/kernel/rcu/tree.h @@ -194,8 +194,6 @@ struct rcu_data { /* 5) Callback offloading. */ #ifdef CONFIG_RCU_NOCB_CPU - atomic_long_t nocb_q_count; /* # CBs waiting for nocb */ - atomic_long_t nocb_q_count_lazy; /* invocation (all stages). */ struct rcu_head *nocb_cb_head; /* CBs ready to invoke. */ struct rcu_head **nocb_cb_tail; struct swait_queue_head nocb_cb_wq; /* For nocb kthreads to sleep on. */ @@ -437,7 +435,6 @@ static void rcu_nocb_unlock_irqrestore(struct rcu_data *rdp, #ifdef CONFIG_RCU_NOCB_CPU static void __init rcu_organize_nocb_kthreads(void); #endif /* #ifdef CONFIG_RCU_NOCB_CPU */ -static unsigned long rcu_get_n_cbs_nocb_cpu(struct rcu_data *rdp); static void rcu_bind_gp_kthread(void); static bool rcu_nohz_full_cpu(void); static void rcu_dynticks_task_enter(void); diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 838e0caaf53a..458838c63a6c 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -2040,15 +2040,6 @@ void rcu_bind_current_to_nocb(void) } EXPORT_SYMBOL_GPL(rcu_bind_current_to_nocb); -/* - * Return the number of RCU callbacks still queued from the specified - * CPU, which must be a nocbs CPU. - */ -static unsigned long rcu_get_n_cbs_nocb_cpu(struct rcu_data *rdp) -{ - return atomic_long_read(&rdp->nocb_q_count); -} - #else /* #ifdef CONFIG_RCU_NOCB_CPU */ /* No ->nocb_lock to acquire. */ @@ -2108,11 +2099,6 @@ static void __init rcu_spawn_nocb_kthreads(void) { } -static unsigned long rcu_get_n_cbs_nocb_cpu(struct rcu_data *rdp) -{ - return 0; -} - #endif /* #else #ifdef CONFIG_RCU_NOCB_CPU */ /* |