netdev - Re: [patch V2 08/15] Documentation: Add lock ordering and nesting documentation

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Date:   Sat, 21 Mar 2020 11:26:06 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     paulmck@...nel.org
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>, Will Deacon <will@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Logan Gunthorpe <logang@...tatee.com>,
        Kurt Schwemmer <kurt.schwemmer@...rosemi.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        Oleg Nesterov <oleg@...hat.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Michael Ellerman <mpe@...erman.id.au>,
        Arnd Bergmann <arnd@...db.de>, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [patch V2 08/15] Documentation: Add lock ordering and nesting documentation

"Paul E. McKenney" <paulmck@...nel.org> writes:
> On Fri, Mar 20, 2020 at 11:36:03PM +0100, Thomas Gleixner wrote:
>> I agree that what I tried to express is hard to parse, but it's at least
>> halfways correct :)
>
> Apologies!  That is what I get for not looking it up in the source.  :-/
>
> OK, so I am stupid enough not only to get it wrong, but also to try again:
>
>    ... Other types of wakeups would normally unconditionally set the
>    task state to RUNNING, but that does not work here because the task
>    must remain blocked until the lock becomes available.  Therefore,
>    when a non-lock wakeup attempts to awaken a task blocked waiting
>    for a spinlock, it instead sets the saved state to RUNNING.  Then,
>    when the lock acquisition completes, the lock wakeup sets the task
>    state to the saved state, in this case setting it to RUNNING.
>
> Is that better?

Definitely!

Thanks for all the editorial work!

       tglx