We use BH context only for synchronization, so we don't care if it's
actually serving softirq or not.

As a side node, in case of threaded NAPI, in_serving_softirq() will
return false because it's in process context with BH off, making
page_pool_recycle_in_cache() unreachable.
Signed-off-by: NQingfang DENG <qingfang.deng@siflower.com.cn>
Tested-by: NFelix Fietkau <nbd@nbd.name>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>