From: Eric Dumazet <edumazet@google.com>
Date: Sat, 31 Mar 2018 19:58:48 +0000 (-0700)
Subject: rhashtable: add schedule points
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=ae6da1f503abb5a5081f9f6c4a6881de97830f3e;p=openwrt%2Fstaging%2Fblogic.git

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>
---

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;