[PATCH net-next 1/2] netconsole: do not warn when the best-effort skb allocation fails

[Breno Leitao]

find_skb() allocates the skb with GFP_ATOMIC as a best-effort attempt:
on failure it falls back to the preallocated skb pool and, failing that,
polls the device and retries. The allocation failing is therefore an
expected and fully handled condition, but without __GFP_NOWARN the page
allocator still emits a warn_alloc() splat with a full stack trace on
every miss, which then consumes the whole SKB pool, that would be useful
printing the real issue rather than the memory failure.

Pass __GFP_NOWARN so the best-effort allocation stays quiet and lets the
existing fallback path do its job.

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

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 862001d09aa84..c1812a98365b7 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -1737,7 +1737,7 @@ static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve)
 	netpoll_zap_completion_queue();
 repeat:
 
-	skb = alloc_skb(len, GFP_ATOMIC);
+	skb = alloc_skb(len, GFP_ATOMIC | __GFP_NOWARN);
 	if (!skb)
 		skb = netcons_skb_pop(np, len);
 

-- 
2.53.0-Meta