netdev - Re: [RFC net-next 1/2] page_pool: allow caching from safely localized NAPI

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Date:   Thu, 30 Mar 2023 22:15:26 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, edumazet@...gle.com, pabeni@...hat.com,
        hawk@...nel.org, ilias.apalodimas@...aro.org
Subject: Re: [RFC net-next 1/2] page_pool: allow caching from safely
 localized NAPI

On Thu, 30 Mar 2023 21:39:05 -0700 Jakub Kicinski wrote:
> +/* If caller didn't allow direct recycling check if we have other reasons
> + * to believe that the producer and consumer can't race.
> + *
> + * Result is only meaningful in softirq context.
> + */
> +static bool page_pool_safe_producer(struct page_pool *pool)
> +{
> +	struct napi_struct *napi = pool->p.napi;
> +
> +	return napi && READ_ONCE(napi->list_owner) == smp_processor_id();

Herm, this also needs && !in_hardirq()