[PATCH 1/8] rhashtable: silence RCU warning in rhashtable_test.

[NeilBrown]

print_ht in rhashtable_test calls rht_dereference() with neither
RCU protection or the mutex.  This triggers an RCU warning.
So take the mutex to silence the warning.

Signed-off-by: NeilBrown <ne...@suse.com>
---
 lib/test_rhashtable.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/test_rhashtable.c b/lib/test_rhashtable.c
index f4000c137dbe..bf92b7aa2a49 100644
--- a/lib/test_rhashtable.c
+++ b/lib/test_rhashtable.c
@@ -499,6 +499,8 @@ static unsigned int __init print_ht(struct rhltable *rhlt)
        unsigned int i, cnt = 0;
 
        ht = &rhlt->ht;
+       /* Take the mutex to avoid RCU warning */
+       mutex_lock(&ht->mutex);
        tbl = rht_dereference(ht->tbl, ht);
        for (i = 0; i < tbl->size; i++) {
                struct rhash_head *pos, *next;
@@ -532,6 +534,7 @@ static unsigned int __init print_ht(struct rhltable *rhlt)
                }
        }
        printk(KERN_ERR "\n---- ht: ----%s\n-------------\n", buff);
+       mutex_unlock(&ht->mutex);
 
        return cnt;
 }