rcu: improve RCU CPU stall-warning messages

The existing RCU CPU stall-warning messages can be confusing, especially
in the case where one CPU detects a single other stalled CPU.  In addition,
the console messages did not say which flavor of RCU detected the stall,
which can make it difficult to work out exactly what is causing the stall.
This commit improves these messages.

Requested-by: Dhaval Giani <dhaval.giani@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

1 files changed, 11 insertions, 9 deletions

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index ec6196fcd1f..f391886be8f 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -54,8 +54,8 @@
 
 static struct lock_class_key rcu_node_class[NUM_RCU_LVLS];
 
-#define RCU_STATE_INITIALIZER(name) { \
-        .level = { &name.node[0] }, \
+#define RCU_STATE_INITIALIZER(structname) { \
+        .level = { &structname.node[0] }, \
         .levelcnt = { \
                 NUM_RCU_LVL_0,  /* root of hierarchy. */ \
                 NUM_RCU_LVL_1, \
@@ -66,13 +66,14 @@ static struct lock_class_key rcu_node_class[NUM_RCU_LVLS];
         .signaled = RCU_GP_IDLE, \
         .gpnum = -300, \
         .completed = -300, \
-        .onofflock = __RAW_SPIN_LOCK_UNLOCKED(&name.onofflock), \
+        .onofflock = __RAW_SPIN_LOCK_UNLOCKED(&structname.onofflock), \
         .orphan_cbs_list = NULL, \
-        .orphan_cbs_tail = &name.orphan_cbs_list, \
+        .orphan_cbs_tail = &structname.orphan_cbs_list, \
         .orphan_qlen = 0, \
-        .fqslock = __RAW_SPIN_LOCK_UNLOCKED(&name.fqslock), \
+        .fqslock = __RAW_SPIN_LOCK_UNLOCKED(&structname.fqslock), \
         .n_force_qs = 0, \
         .n_force_qs_ngp = 0, \
+        .name = #structname, \
 }
 
 struct rcu_state rcu_sched_state = RCU_STATE_INITIALIZER(rcu_sched_state);
@@ -483,7 +484,8 @@ static void print_other_cpu_stall(struct rcu_state *rsp)
 
         /* OK, time to rat on our buddy... */
 
-        printk(KERN_ERR "INFO: RCU detected CPU stalls:");
+        printk(KERN_ERR "INFO: %s detected stalls on CPUs/tasks: {",
+               rsp->name);
         rcu_for_each_leaf_node(rsp, rnp) {
                 raw_spin_lock_irqsave(&rnp->lock, flags);
                 rcu_print_task_stall(rnp);
@@ -494,7 +496,7 @@ static void print_other_cpu_stall(struct rcu_state *rsp)
                         if (rnp->qsmask & (1UL << cpu))
                                 printk(" %d", rnp->grplo + cpu);
         }
-        printk(" (detected by %d, t=%ld jiffies)\n",
+        printk("} (detected by %d, t=%ld jiffies)\n",
                smp_processor_id(), (long)(jiffies - rsp->gp_start));
         trigger_all_cpu_backtrace();
 
@@ -510,8 +512,8 @@ static void print_cpu_stall(struct rcu_state *rsp)
         unsigned long flags;
         struct rcu_node *rnp = rcu_get_root(rsp);
 
-        printk(KERN_ERR "INFO: RCU detected CPU %d stall (t=%lu jiffies)\n",
-                        smp_processor_id(), jiffies - rsp->gp_start);
+        printk(KERN_ERR "INFO: %s detected stall on CPU %d (t=%lu jiffies)\n",
+               rsp->name, smp_processor_id(), jiffies - rsp->gp_start);
         trigger_all_cpu_backtrace();
 
         raw_spin_lock_irqsave(&rnp->lock, flags);