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rcu: Fix missing task information during rcu-preempt stall 

The first item list_for_each_entry_continue(alist) iterates over is
alist->next, rather than alist itself. Consequently,
rcu_print_detail_task_stall_rnp() skips the task referenced by gp_tasks.

Use gp_tasks->prev as the argument to list_for_each_entry_continue()
instead.

Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Patrick Daly 2015-04-07 15:12:07 -07:00 committed by Paul E. McKenney
parent a76ff6884b
commit 82efed06d5
1 changed files with 2 additions and 2 deletions
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4
kernel/rcu/tree_plugin.h
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@ -395,7 +395,7 @@ static void rcu_print_detail_task_stall_rnp(struct rcu_node *rnp)
raw_spin_unlock_irqrestore(&rnp->lock, flags); raw_spin_unlock_irqrestore(&rnp->lock, flags);
return; return;
} }
t = list_entry(rnp->gp_tasks, t = list_entry(rnp->gp_tasks->prev,
struct task_struct, rcu_node_entry); struct task_struct, rcu_node_entry);
list_for_each_entry_continue(t, &rnp->blkd_tasks, rcu_node_entry) list_for_each_entry_continue(t, &rnp->blkd_tasks, rcu_node_entry)
sched_show_task(t); sched_show_task(t);
@ -452,7 +452,7 @@ static int rcu_print_task_stall(struct rcu_node *rnp)
if (!rcu_preempt_blocked_readers_cgp(rnp)) if (!rcu_preempt_blocked_readers_cgp(rnp))
return 0; return 0;
rcu_print_task_stall_begin(rnp); rcu_print_task_stall_begin(rnp);
t = list_entry(rnp->gp_tasks, t = list_entry(rnp->gp_tasks->prev,
struct task_struct, rcu_node_entry); struct task_struct, rcu_node_entry);
list_for_each_entry_continue(t, &rnp->blkd_tasks, rcu_node_entry) { list_for_each_entry_continue(t, &rnp->blkd_tasks, rcu_node_entry) {
pr_cont(" P%d", t->pid); pr_cont(" P%d", t->pid);