From 374fb014fc5b15e420faa00af036868a635eadd3 Mon Sep 17 00:00:00 2001
From: John Fastabend <john.fastabend@gmail.com>
Date: Fri, 8 Sep 2017 14:01:10 -0700
Subject: [PATCH] bpf: devmap, use cond_resched instead of cpu_relax
Be a bit more friendly about waiting for flush bits to complete.
Replace the cpu_relax() with a cond_resched().
Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
kernel/bpf/devmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c
index ecf9f99ecc579..959c9a07f318b 100644
--- a/kernel/bpf/devmap.c
+++ b/kernel/bpf/devmap.c
@@ -159,7 +159,7 @@ static void dev_map_free(struct bpf_map *map)
unsigned long *bitmap = per_cpu_ptr(dtab->flush_needed, cpu);
while (!bitmap_empty(bitmap, dtab->map.max_entries))
- cpu_relax();
+ cond_resched();
}
for (i = 0; i < dtab->map.max_entries; i++) {
--
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