netdev - Re: [PATCH net-next 1/9] net: devlink: remove region snapshot ID tracking dependency on devlink->lock

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Message-ID: <YuJVDSTtjyiRLeHn@nanopsycho>
Date:   Thu, 28 Jul 2022 11:21:17 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Moshe Shemesh <moshe@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        Tariq Toukan <tariqt@...dia.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, Jiri Pirko <jiri@...dia.com>,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next 1/9] net: devlink: remove region snapshot ID
 tracking dependency on devlink->lock

Thu, Jul 28, 2022 at 10:46:29AM CEST, jiri@...nulli.us wrote:
>Thu, Jul 28, 2022 at 03:58:51AM CEST, kuba@...nel.org wrote:
>>On Wed, 27 Jul 2022 20:03:28 +0300 Moshe Shemesh wrote:
>>> So resolve this by removing dependency on devlink->lock for region
>>> snapshot ID tracking by using internal xa_lock() to maintain
>>> shapshot_ids xa_array consistency.
>>
>>xa_lock() is a spin lock, right?  s/GFP_KERNEL/GFP_ATOMIC/
>
>Correct, will fix.

Well, from how I read __xa_store(), it should be ok to have GFP_KERNEL
here, but I don't think it has any benefit over GFP_ATOMIC in this
usecase, so I will change it to GFP_ATOMIC.