linux-kernel - [PATCH tip/core/rcu 3/6] rcu: Change printk() %p to %pK

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Message-Id: <1512157320-23205-3-git-send-email-paulmck@linux.vnet.ibm.com>
Date:   Fri,  1 Dec 2017 11:41:57 -0800
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,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 3/6] rcu: Change printk() %p to %pK

This commit changes the %p printk() in rcutorture to %pK.  This could
be considered irrelevant, given that any user able to start rcutorture
could inflict far heavier damage on the system, but it doesn't hurt to
change it and doing so avoids script-generated noise.

Reported-by: Tobin C. Harding <me@...in.cc>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 kernel/rcu/tree.c        | 4 ++--
 kernel/rcu/tree_plugin.h | 2 +-
 kernel/rcu/update.c      | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index f9c0ca2ccf0c..70c48c279323 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3103,7 +3103,7 @@ __call_rcu(struct rcu_head *head, rcu_callback_t func,
 		 * Use rcu:rcu_callback trace event to find the previous
 		 * time callback was passed to __call_rcu().
 		 */
-		WARN_ONCE(1, "__call_rcu(): Double-freed CB %p->%pF()!!!\n",
+		WARN_ONCE(1, "__call_rcu(): Double-freed CB %pK->%pF()!!!\n",
 			  head, head->func);
 		WRITE_ONCE(head->func, rcu_leak_callback);
 		return;
@@ -3985,7 +3985,7 @@ static void rcu_migrate_callbacks(int cpu, struct rcu_state *rsp)
 	raw_spin_unlock_irqrestore_rcu_node(rnp_root, flags);
 	WARN_ONCE(rcu_segcblist_n_cbs(&rdp->cblist) != 0 ||
 		  !rcu_segcblist_empty(&rdp->cblist),
-		  "rcu_cleanup_dead_cpu: Callbacks on offline CPU %d: qlen=%lu, 1stCB=%p\n",
+		  "rcu_cleanup_dead_cpu: Callbacks on offline CPU %d: qlen=%lu, 1stCB=%pK\n",
 		  cpu, rcu_segcblist_n_cbs(&rdp->cblist),
 		  rcu_segcblist_first_cb(&rdp->cblist));
 }
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index db85ca3975f1..a9807aca69aa 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -1899,7 +1899,7 @@ static bool rcu_nocb_cpu_needs_barrier(struct rcu_state *rsp, int cpu)
 	if (!READ_ONCE(rdp->nocb_kthread) && rhp &&
 	    rcu_scheduler_fully_active) {
 		/* RCU callback enqueued before CPU first came online??? */
-		pr_err("RCU: Never-onlined no-CBs CPU %d has CB %p\n",
+		pr_err("RCU: Never-onlined no-CBs CPU %d has CB %pK\n",
 		       cpu, rhp->func);
 		WARN_ON_ONCE(1);
 	}
diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
index fbd56d6e575b..8d591d8411fe 100644
--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
@@ -696,7 +696,7 @@ static void check_holdout_task(struct task_struct *t,
 		*firstreport = false;
 	}
 	cpu = task_cpu(t);
-	pr_alert("%p: %c%c nvcsw: %lu/%lu holdout: %d idle_cpu: %d/%d\n",
+	pr_alert("%pK: %c%c nvcsw: %lu/%lu holdout: %d idle_cpu: %d/%d\n",
 		 t, ".I"[is_idle_task(t)],
 		 "N."[cpu < 0 || !tick_nohz_full_cpu(cpu)],
 		 t->rcu_tasks_nvcsw, t->nvcsw, t->rcu_tasks_holdout,
-- 
2.5.2