linux-kernel - Re: [PATCH net] net: page_pool: use in

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Date:   Wed, 1 Feb 2023 22:01:05 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Qingfang DENG <dqfext@...il.com>
Cc:     Jesper Dangaard Brouer <hawk@...nel.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: page_pool: use in_softirq() instead

On Thu,  2 Feb 2023 10:44:17 +0800 Qingfang DENG wrote:
> From: Qingfang DENG <qingfang.deng@...lower.com.cn>
> 
> 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.

LGTM, but I don't think this qualifies as a fix.
It's just a missed optimization, right?