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McKenney" 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" Subject: [PATCH tip/core/rcu 36/52] rcu: Remove rsp parameter from rcu_spawn_one_boost_kthread() Date: Wed, 29 Aug 2018 15:38:38 -0700 X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180829223830.GA1800@linux.vnet.ibm.com> References: <20180829223830.GA1800@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18082922-0064-0000-0000-00000344000A X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00009636; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000266; SDB=6.01080744; UDB=6.00557497; IPR=6.00860729; MB=3.00023002; MTD=3.00000008; XFM=3.00000015; UTC=2018-08-29 22:39:02 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18082922-0065-0000-0000-00003A7847CC Message-Id: <20180829223854.4055-36-paulmck@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-08-29_06:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1808290220 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There now is only one rcu_state structure in a given build of the Linux kernel, so there is no need to pass it as a parameter to RCU's functions. This commit therefore removes the rsp parameter from rcu_spawn_one_boost_kthread(). Signed-off-by: Paul E. McKenney --- kernel/rcu/tree.h | 4 ---- kernel/rcu/tree_plugin.h | 13 ++++++------- 2 files changed, 6 insertions(+), 11 deletions(-) diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h index ccdee6bd3919..dc1c337f6da9 100644 --- a/kernel/rcu/tree.h +++ b/kernel/rcu/tree.h @@ -463,10 +463,6 @@ static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags); static void rcu_preempt_boost_start_gp(struct rcu_node *rnp); static void invoke_rcu_callbacks_kthread(void); static bool rcu_is_callbacks_kthread(void); -#ifdef CONFIG_RCU_BOOST -static int rcu_spawn_one_boost_kthread(struct rcu_state *rsp, - struct rcu_node *rnp); -#endif /* #ifdef CONFIG_RCU_BOOST */ static void __init rcu_spawn_boost_kthreads(void); static void rcu_prepare_kthreads(int cpu); static void rcu_cleanup_after_idle(void); diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 9a3d30121815..9a6dea5fab86 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -1290,21 +1290,20 @@ static void rcu_preempt_boost_start_gp(struct rcu_node *rnp) * already exist. We only create this kthread for preemptible RCU. * Returns zero if all is well, a negated errno otherwise. */ -static int rcu_spawn_one_boost_kthread(struct rcu_state *rsp, - struct rcu_node *rnp) +static int rcu_spawn_one_boost_kthread(struct rcu_node *rnp) { - int rnp_index = rnp - &rsp->node[0]; + int rnp_index = rnp - rcu_get_root(); unsigned long flags; struct sched_param sp; struct task_struct *t; - if (&rcu_state != rsp) + if (!IS_ENABLED(CONFIG_PREEMPT_RCU)) return 0; if (!rcu_scheduler_fully_active || rcu_rnp_online_cpus(rnp) == 0) return 0; - rsp->boost = 1; + rcu_state.boost = 1; if (rnp->boost_kthread_task != NULL) return 0; t = kthread_create(rcu_boost_kthread, (void *)rnp, @@ -1430,7 +1429,7 @@ static void __init rcu_spawn_boost_kthreads(void) per_cpu(rcu_cpu_has_work, cpu) = 0; BUG_ON(smpboot_register_percpu_thread(&rcu_cpu_thread_spec)); rcu_for_each_leaf_node(&rcu_state, rnp) - (void)rcu_spawn_one_boost_kthread(&rcu_state, rnp); + (void)rcu_spawn_one_boost_kthread(rnp); } static void rcu_prepare_kthreads(int cpu) @@ -1440,7 +1439,7 @@ static void rcu_prepare_kthreads(int cpu) /* Fire up the incoming CPU's kthread and leaf rcu_node kthread. */ if (rcu_scheduler_fully_active) - (void)rcu_spawn_one_boost_kthread(&rcu_state, rnp); + (void)rcu_spawn_one_boost_kthread(rnp); } #else /* #ifdef CONFIG_RCU_BOOST */ -- 2.17.1