[PATCH net-next 2/2] netpoll: do not warn when the best-effort pool refill fails

[Breno Leitao]

refill_skbs() tops up the per-netpoll skb pool with GFP_ATOMIC and
simply stops on the first allocation failure, leaving the pool partially
filled; a later refill tops it up once memory frees up. The allocation
failing is therefore an expected and fully handled condition, but
without __GFP_NOWARN the page allocator emits a warn_alloc() splat with
a full stack trace on every miss.

Pass __GFP_NOWARN so the best-effort refill stays quiet, mirroring the
same change in netconsole's find_skb().

Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx>
---
 net/core/netpoll.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 229dde818ab33..85aa513508811 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -221,7 +221,7 @@ static void refill_skbs(struct netpoll *np)
 	skb_pool = &np->skb_pool;
 
 	while (READ_ONCE(skb_pool->qlen) < MAX_SKBS) {
-		skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC);
+		skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC | __GFP_NOWARN);
 		if (!skb)
 			break;
 

-- 
2.53.0-Meta