linux-kernel - Re: [PATCH 1/3] rtmutex: comments update

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Date:   Thu, 13 Apr 2017 12:00:46 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Alex Shi <alex.shi@...aro.org>
Cc:     peterz@...radead.org, mingo@...hat.com, corbet@....net,
        linux-kernel@...r.kernel.org (open list:LOCKING PRIMITIVES),
        linux-doc@...r.kernel.org (open list:DOCUMENTATION),
        Sebastian Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/3] rtmutex: comments update

On Thu, 13 Apr 2017 22:02:52 +0800
Alex Shi <alex.shi@...aro.org> wrote:

> The rt-mutex documents didn't gotten meaningful update from its first
> version. Even after owner's pending bit was removed in commit 8161239a8bcc
> ("rtmutex: Simplify PI algorithm and make highest prio task get lock")
> and priority list 'plist' changed to rbtree. So the documents are far
> late of real code.

BTW, there is still technically a "Pending Owner", it's just not called
that anymore. The pending owner happens to be the top_waiter of a lock
that has no owner and has been woken up to grab the lock. This change
simplified the code. The document should reflect this point.

-- Steve