linux-kernel - [PATCH tip/core/rcu 34/52] rcu: Remove rsp parameter from rcu_print_detail_task

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Date:   Wed, 29 Aug 2018 15:38:36 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org
Cc:     mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com, joel@...lfernandes.org,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 34/52] rcu: Remove rsp parameter from rcu_print_detail_task_stall()

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_print_detail_task_stall().

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 kernel/rcu/tree.c        | 2 +-
 kernel/rcu/tree.h        | 2 +-
 kernel/rcu/tree_plugin.h | 6 +++---
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 6183c2889a9f..e484ee95a192 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1359,7 +1359,7 @@ static void print_other_cpu_stall(unsigned long gp_seq)
 		rcu_dump_cpu_stacks();
 
 		/* Complain about tasks blocking the grace period. */
-		rcu_print_detail_task_stall(rsp);
+		rcu_print_detail_task_stall();
 	} else {
 		if (rcu_seq_current(&rsp->gp_seq) != gp_seq) {
 			pr_err("INFO: Stall ended before state dump start\n");
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index d60304f1ef56..00d268cb4d04 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -452,7 +452,7 @@ static int rcu_preempt_blocked_readers_cgp(struct rcu_node *rnp);
 #ifdef CONFIG_HOTPLUG_CPU
 static bool rcu_preempt_has_tasks(struct rcu_node *rnp);
 #endif /* #ifdef CONFIG_HOTPLUG_CPU */
-static void rcu_print_detail_task_stall(struct rcu_state *rsp);
+static void rcu_print_detail_task_stall(void);
 static int rcu_print_task_stall(struct rcu_node *rnp);
 static int rcu_print_task_exp_stall(struct rcu_node *rnp);
 static void rcu_preempt_check_blocked_tasks(struct rcu_state *rsp,
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index c678c76a754e..1d8148b0d4e5 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -683,12 +683,12 @@ static void rcu_print_detail_task_stall_rnp(struct rcu_node *rnp)
  * Dump detailed information for all tasks blocking the current RCU
  * grace period.
  */
-static void rcu_print_detail_task_stall(struct rcu_state *rsp)
+static void rcu_print_detail_task_stall(void)
 {
 	struct rcu_node *rnp = rcu_get_root();
 
 	rcu_print_detail_task_stall_rnp(rnp);
-	rcu_for_each_leaf_node(rsp, rnp)
+	rcu_for_each_leaf_node(&rcu_state, rnp)
 		rcu_print_detail_task_stall_rnp(rnp);
 }
 
@@ -1005,7 +1005,7 @@ static void rcu_preempt_deferred_qs(struct task_struct *t) { }
  * Because preemptible RCU does not exist, we never have to check for
  * tasks blocked within RCU read-side critical sections.
  */
-static void rcu_print_detail_task_stall(struct rcu_state *rsp)
+static void rcu_print_detail_task_stall(void)
 {
 }
 
-- 
2.17.1