netdev - Re: [net-next v2 8/8] i40e: Remove scheduling while atomic possibility

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Message-ID: <20200623175913.529619f0@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Tue, 23 Jun 2020 17:59:13 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:     davem@...emloft.net,
        Aleksandr Loktionov <aleksandr.loktionov@...el.com>,
        netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
        Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
        Andrew Bowers <andrewx.bowers@...el.com>
Subject: Re: [net-next v2 8/8] i40e: Remove scheduling while atomic
 possibility

On Tue, 23 Jun 2020 17:22:52 -0700 Jeff Kirsher wrote:
> From: Aleksandr Loktionov <aleksandr.loktionov@...el.com>
> 
> In some occasions task held spinlock, 

Which spin lock?

> while being rescheduled due to mutex_lock. 

Which mutex?

> Moved function call outside of atomic context.

What function?

> Without this patch there is a race condition, which might result in
> scheduling while atomic.

What is the race condition?