[PATCH bpf] bpf: add schedule point in htab_init_buckets()

[Eric Dumazet]

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

We noticed that with a LOCKDEP enabled kernel,
allocating a hash table with 65536 buckets would
use more than 60ms.

htab_init_buckets() runs from process context,
it is safe to schedule to avoid latency spikes.

Fixes: c50eb518e262 ("bpf: Use separate lockdep class for each hashtab")
Signed-off-by: Eric Dumazet <eduma...@google.com>
Reported-By: John Sperbeck <jsperb...@google.com>
Cc: Song Liu <songliubrav...@fb.com>
---
 kernel/bpf/hashtab.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/bpf/hashtab.c b/kernel/bpf/hashtab.c
index 
7e848200cd268a0f9ed063f0b641d3c355787013..c1ac7f964bc997925fd427f5192168829d812e5d
 100644
--- a/kernel/bpf/hashtab.c
+++ b/kernel/bpf/hashtab.c
@@ -152,6 +152,7 @@ static void htab_init_buckets(struct bpf_htab *htab)
                        lockdep_set_class(&htab->buckets[i].lock,
                                          &htab->lockdep_key);
                }
+               cond_resched();
        }
 }
 
-- 
2.29.2.729.g45daf8777d-goog