From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org,
rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com,
fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 51/52] rcu: Eliminate initialization-time use of rsp
Date: Wed, 29 Aug 2018 15:38:53 -0700 [thread overview]
Message-ID: <20180829223854.4055-51-paulmck@linux.vnet.ibm.com> (raw)
In-Reply-To: <20180829223830.GA1800@linux.vnet.ibm.com>
Now that there is only one rcu_state structure, there is less point in
maintaining a pointer to it. This commit therefore replaces rsp with
&rcu_state in rcu_cpu_starting() and rcu_init_one().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
kernel/rcu/tree.c | 25 ++++++++++++-------------
1 file changed, 12 insertions(+), 13 deletions(-)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index e573fb9f0ef8..9c82981d7822 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3454,7 +3454,6 @@ void rcu_cpu_starting(unsigned int cpu)
unsigned long oldmask;
struct rcu_data *rdp;
struct rcu_node *rnp;
- struct rcu_state *rsp = &rcu_state;
if (per_cpu(rcu_cpu_started, cpu))
return;
@@ -3471,10 +3470,10 @@ void rcu_cpu_starting(unsigned int cpu)
oldmask ^= rnp->expmaskinitnext;
nbits = bitmap_weight(&oldmask, BITS_PER_LONG);
/* Allow lockless access for expedited grace periods. */
- smp_store_release(&rsp->ncpus, rsp->ncpus + nbits); /* ^^^ */
+ smp_store_release(&rcu_state.ncpus, rcu_state.ncpus + nbits); /* ^^^ */
rcu_gpnum_ovf(rnp, rdp); /* Offline-induced counter wrap? */
- rdp->rcu_onl_gp_seq = READ_ONCE(rsp->gp_seq);
- rdp->rcu_onl_gp_flags = READ_ONCE(rsp->gp_flags);
+ rdp->rcu_onl_gp_seq = READ_ONCE(rcu_state.gp_seq);
+ rdp->rcu_onl_gp_flags = READ_ONCE(rcu_state.gp_flags);
if (rnp->qsmask & mask) { /* RCU waiting on incoming CPU? */
/* Report QS -after- changing ->qsmaskinitnext! */
rcu_report_qs_rnp(mask, rnp, rnp->gp_seq, flags);
@@ -3666,7 +3665,6 @@ static void __init rcu_init_one(void)
int i;
int j;
struct rcu_node *rnp;
- struct rcu_state *rsp = &rcu_state;
BUILD_BUG_ON(RCU_NUM_LVLS > ARRAY_SIZE(buf)); /* Fix buf[] init! */
@@ -3677,14 +3675,15 @@ static void __init rcu_init_one(void)
/* Initialize the level-tracking arrays. */
for (i = 1; i < rcu_num_lvls; i++)
- rsp->level[i] = rsp->level[i - 1] + num_rcu_lvl[i - 1];
+ rcu_state.level[i] =
+ rcu_state.level[i - 1] + num_rcu_lvl[i - 1];
rcu_init_levelspread(levelspread, num_rcu_lvl);
/* Initialize the elements themselves, starting from the leaves. */
for (i = rcu_num_lvls - 1; i >= 0; i--) {
cpustride *= levelspread[i];
- rnp = rsp->level[i];
+ rnp = rcu_state.level[i];
for (j = 0; j < num_rcu_lvl[i]; j++, rnp++) {
raw_spin_lock_init(&ACCESS_PRIVATE(rnp, lock));
lockdep_set_class_and_name(&ACCESS_PRIVATE(rnp, lock),
@@ -3692,9 +3691,9 @@ static void __init rcu_init_one(void)
raw_spin_lock_init(&rnp->fqslock);
lockdep_set_class_and_name(&rnp->fqslock,
&rcu_fqs_class[i], fqs[i]);
- rnp->gp_seq = rsp->gp_seq;
- rnp->gp_seq_needed = rsp->gp_seq;
- rnp->completedqs = rsp->gp_seq;
+ rnp->gp_seq = rcu_state.gp_seq;
+ rnp->gp_seq_needed = rcu_state.gp_seq;
+ rnp->completedqs = rcu_state.gp_seq;
rnp->qsmask = 0;
rnp->qsmaskinit = 0;
rnp->grplo = j * cpustride;
@@ -3708,7 +3707,7 @@ static void __init rcu_init_one(void)
} else {
rnp->grpnum = j % levelspread[i - 1];
rnp->grpmask = 1UL << rnp->grpnum;
- rnp->parent = rsp->level[i - 1] +
+ rnp->parent = rcu_state.level[i - 1] +
j / levelspread[i - 1];
}
rnp->level = i;
@@ -3722,8 +3721,8 @@ static void __init rcu_init_one(void)
}
}
- init_swait_queue_head(&rsp->gp_wq);
- init_swait_queue_head(&rsp->expedited_wq);
+ init_swait_queue_head(&rcu_state.gp_wq);
+ init_swait_queue_head(&rcu_state.expedited_wq);
rnp = rcu_first_leaf_node();
for_each_possible_cpu(i) {
while (i > rnp->grphi)
--
2.17.1
next prev parent reply other threads:[~2018-08-29 22:40 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-29 22:38 [PATCH tip/core/rcu 0/52] Remove rcu_state pointers for v4.20/v5.0 Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 01/52] rcu: Remove rsp parameter from rcu_report_qs_rnp() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 02/52] rcu: Remove rsp parameter from rcu_report_qs_rsp() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 03/52] rcu: Remove rsp parameter from rcu_report_unblock_qs_rnp() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 04/52] rcu: Remove rsp parameter from rcu_report_qs_rdp() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 05/52] rcu: Remove rsp parameter from rcu_gp_in_progress() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 06/52] rcu: Remove rsp parameter from rcu_get_root() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 07/52] rcu: Remove rsp parameter from record_gp_stall_check_time() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 08/52] rcu: Remove rsp parameter from rcu_check_gp_kthread_starvation() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 09/52] rcu: Remove rsp parameter from rcu_dump_cpu_stacks() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 10/52] rcu: Remove rsp parameter from rcu_stall_kick_kthreads() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 11/52] rcu: Remove rsp parameter from print_other_cpu_stall() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 12/52] rcu: Remove rsp parameter from print_cpu_stall() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 13/52] rcu: Remove rsp parameter from check_cpu_stall() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 14/52] rcu: Remove rsp parameter from rcu_future_gp_cleanup() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 15/52] rcu: Remove rsp parameter from rcu_gp_kthread_wake() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 16/52] rcu: Remove rsp parameter from rcu_accelerate_cbs() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 17/52] rcu: Remove rsp parameter from rcu_accelerate_cbs_unlocked() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 18/52] rcu: Remove rsp parameter from rcu_advance_cbs() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 19/52] rcu: Remove rsp parameter from __note_gp_changes() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 20/52] rcu: Remove rsp parameter from note_gp_changes() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 21/52] rcu: Remove rsp parameter from rcu_gp_slow() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 22/52] rcu: Remove rsp parameter from rcu_gp_kthread() and friends Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 23/52] rcu: Remove rsp parameter from rcu_check_quiescent_state() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 24/52] rcu: Remove rsp parameter from CPU hotplug functions Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 25/52] rcu: Remove rsp parameter from rcu_do_batch() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 26/52] rcu: Remove rsp parameter from force-quiescent-state functions Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 27/52] rcu: Remove rsp parameter from rcu_check_gp_start_stall() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 28/52] rcu: Remove rsp parameter from __rcu_process_callbacks() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 29/52] rcu: Remove rsp parameter from __call_rcu() and friend Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 30/52] rcu: Remove rsp parameter from __rcu_pending() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 31/52] rcu: Remove rsp parameter from _rcu_barrier() and friends Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 32/52] rcu: Remove rsp parameter from rcu_boot_init_percpu_data() " Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 33/52] rcu: Remove rsp parameter from rcu_init_one() " Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 34/52] rcu: Remove rsp parameter from rcu_print_detail_task_stall() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 35/52] rcu: Remove rsp parameter from dump_blkd_tasks() and friend Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 36/52] rcu: Remove rsp parameter from rcu_spawn_one_boost_kthread() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 37/52] rcu: Remove rsp parameter from print_cpu_stall_info() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 38/52] rcu: Remove rsp parameter from no-CBs CPU functions Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 39/52] rcu: Remove rsp parameter from expedited grace-period functions Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 40/52] rcu: Remove rsp parameter from rcu_node tree accessor macros Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 41/52] rcu: Remove rcu_data structure's ->rsp field Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 42/52] rcu: Remove last non-flavor-traversal rsp local variable from tree_plugin.h Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 43/52] rcu: Remove for_each_rcu_flavor() flavor-traversal macro Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 44/52] rcu: Simplify rcutorture_get_gp_data() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 45/52] rcu: Restructure rcu_check_gp_kthread_starvation() Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 46/52] rcu: Eliminate stall-warning use of rsp Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 47/52] rcu: Eliminate grace-period management code " Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 48/52] rcu: Eliminate callback-invocation/invocation " Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 49/52] rcu: Eliminate quiescent-state and grace-period-nonstart " Paul E. McKenney
2018-08-29 22:38 ` [PATCH tip/core/rcu 50/52] rcu: Eliminate RCU-barrier " Paul E. McKenney
2018-08-29 22:38 ` Paul E. McKenney [this message]
2018-08-29 22:38 ` [PATCH tip/core/rcu 52/52] rcu: Fix typo in force_qs_rnp()'s parameter's parameter Paul E. McKenney
2018-08-30 2:00 ` [PATCH tip/core/rcu 0/52] Remove rcu_state pointers for v4.20/v5.0 Steven Rostedt
2018-08-30 3:22 ` Paul E. McKenney
2018-08-30 4:10 ` Paul E. McKenney
2018-08-30 4:20 ` Josh Triplett
2018-08-30 15:42 ` Steven Rostedt
2018-08-30 15:44 ` Steven Rostedt
2018-08-30 17:10 ` Paul E. McKenney
2018-08-30 17:40 ` Steven Rostedt
2018-08-30 18:26 ` Paul E. McKenney
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