rhashtable: add schedule points

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 <edumazet@google.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index 47de025b6245..2b2b79974b61 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -333,6 +333,7 @@ static int rhashtable_rehash_table(struct rhashtable *ht)
                 err = rhashtable_rehash_chain(ht, old_hash);
                 if (err)
                         return err;
+                cond_resched();
         }
 
         /* Publish the new table pointer. */
@@ -1112,6 +1113,7 @@ 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(*rht_bucket(tbl, i), ht),
                              next = !rht_is_a_nulls(pos) ?
                                         rht_dereference(pos->next, ht) : NULL;