[PATCH stable 4.9 v2 07/29] rhashtable: add schedule points

[Florian Fainelli]

From: Eric Dumazet <eduma...@google.com>

Rehashing and destroying large hash table takes a lot of time,
and happens in process context. It is safe to add cond_resched()
in rhashtable_rehash_table() and rhashtable_free_and_destroy()

Signed-off-by: Eric Dumazet <eduma...@google.com>
Acked-by: Herbert Xu <herb...@gondor.apana.org.au>
Signed-off-by: David S. Miller <da...@davemloft.net>
(cherry picked from commit ae6da1f503abb5a5081f9f6c4a6881de97830f3e)
---
 lib/rhashtable.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index 101dac085c62..fdffd6232365 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -251,8 +251,10 @@ static int rhashtable_rehash_table(struct rhashtable *ht)
        if (!new_tbl)
                return 0;
 
-       for (old_hash = 0; old_hash < old_tbl->size; old_hash++)
+       for (old_hash = 0; old_hash < old_tbl->size; old_hash++) {
                rhashtable_rehash_chain(ht, old_hash);
+               cond_resched();
+       }
 
        /* Publish the new table pointer. */
        rcu_assign_pointer(ht->tbl, new_tbl);
@@ -993,6 +995,7 @@ void rhashtable_free_and_destroy(struct rhashtable *ht,
                for (i = 0; i < tbl->size; i++) {
                        struct rhash_head *pos, *next;
 
+                       cond_resched();
                        for (pos = rht_dereference(tbl->buckets[i], ht),
                             next = !rht_is_a_nulls(pos) ?
                                        rht_dereference(pos->next, ht) : NULL;
-- 
2.17.1