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From: Darren Hart <dvhart@infradead.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Darren Hart <darren@dvhart.com>,
	Davidlohr Bueso <dave@stgolabs.net>,
	Bhuvanesh_Surachari@mentor.com, Andy Lowe <Andy_Lowe@mentor.com>
Subject: Re: [patch 5/5] futex: Cleanup the goto confusion in requeue_pi()
Date: Sat, 19 Dec 2015 21:46:02 -0800	[thread overview]
Message-ID: <20151220054602.GK7244@malice.jf.intel.com> (raw)
In-Reply-To: <20151220051524.GH7244@malice.jf.intel.com>

On Sat, Dec 19, 2015 at 09:15:24PM -0800, Darren Hart wrote:
> 
> As a follow-on, I think it might be worthwhile to create a symmetrical
> get_pi_state() to the put_pi_state(), rather than handling the atomic_inc
> directly.
> 
> And finally, while the break; in futex_requeue works, that function is quite
> long and an explicit out_put_pi_state: label would make the intention clear and
> also avoid inadvertently breaking the implicit behavior of the break.
> 

And while prototyping these changes, I've changed my mind, neither is a
worthwhile change.

The plist_for_each in futex_requeue really isn't that long and the breaks occur
in a logical way and are now well documented with this series. An inadvertent
change to this behavior seems unlikely.

There is only one open coded atomic_inc in futex.c for the pi_state refcount,
hardly worth a wrapper.

Regards,

-- 
Darren Hart
Intel Open Source Technology Center

  parent reply	other threads:[~2015-12-20  5:46 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-19 20:07 [patch 0/5] futex: Plug a pi_state leak and clarify the refcounting Thomas Gleixner
2015-12-19 20:07 ` [patch 1/5] futex: Drop refcount if requeue_pi() acquired the rtmutex Thomas Gleixner
2015-12-20 13:18   ` [tip:locking/core] " tip-bot for Thomas Gleixner
2015-12-19 20:07 ` [patch 2/5] futex: Rename free_pi_state() to put_pi_state() Thomas Gleixner
2015-12-20 13:19   ` [tip:locking/core] futex: Rename free_pi_state() to put_pi_state( ) tip-bot for Thomas Gleixner
2015-12-19 20:07 ` [patch 3/5] futex: Document pi_state refcounting in requeue code Thomas Gleixner
2015-12-20  7:41   ` Darren Hart
2015-12-20 13:19   ` [tip:locking/core] " tip-bot for Thomas Gleixner
2015-12-19 20:07 ` [patch 4/5] futex: Remove pointless put_pi_state calls in requeue() Thomas Gleixner
2015-12-20 13:19   ` [tip:locking/core] " tip-bot for Thomas Gleixner
2015-12-19 20:07 ` [patch 5/5] futex: Cleanup the goto confusion in requeue_pi() Thomas Gleixner
2015-12-20  5:15   ` Darren Hart
2015-12-20  5:40     ` Mike Galbraith
2015-12-20  7:37       ` Darren Hart
2015-12-20  5:46     ` Darren Hart [this message]
2015-12-20 13:20   ` [tip:locking/core] " tip-bot for Thomas Gleixner

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