[PATCH] workqueue: show the pool ID of the default pwq's pool in the pool_ids file

[Lai Jiangshan]

It seems incomplete if the pool_ids file doesn't include the default
pwq's pool.  Add it and the result:

# cat pool_ids 
0:9 1:10
default:8

rcu_read_lock_sched() is also changed to mutex_lock(&wq->mutex)
for accessing the default pwq.

Signed-off-by: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
---
 kernel/workqueue.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 5dbe22a..6af95210 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -3004,7 +3004,7 @@ static ssize_t wq_pool_ids_show(struct device *dev,
 	const char *delim = "";
 	int node, written = 0;
 
-	rcu_read_lock_sched();
+	mutex_lock(&wq->mutex);
 	for_each_node(node) {
 		written += scnprintf(buf + written, PAGE_SIZE - written,
 				     "%s%d:%d", delim, node,
@@ -3012,7 +3012,9 @@ static ssize_t wq_pool_ids_show(struct device *dev,
 		delim = " ";
 	}
 	written += scnprintf(buf + written, PAGE_SIZE - written, "\n");
-	rcu_read_unlock_sched();
+	written += scnprintf(buf + written, PAGE_SIZE - written,
+			     "default:%d\n", wq->dfl_pwq->pool->id);
+	mutex_unlock(&wq->mutex);
 
 	return written;
 }
-- 
1.7.4.4

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