linux-kernel - Re: [PATCH v4 3/4] futex: Document ordering guarantees

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Date:	Thu, 19 Dec 2013 15:05:14 -0800
From:	Randy Dunlap <rdunlap@...radead.org>
To:	Darren Hart <dvhart@...ux.intel.com>,
	Davidlohr Bueso <davidlohr@...com>
CC:	linux-kernel@...r.kernel.org, mingo@...hat.com,
	peterz@...radead.org, tglx@...utronix.de,
	paulmck@...ux.vnet.ibm.com, efault@....de, jeffm@...e.com,
	torvalds@...ux-foundation.org, jason.low2@...com,
	Waiman.Long@...com, tom.vaden@...com, scott.norton@...com,
	aswin@...com, Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v4 3/4] futex: Document ordering guarantees

On 12/19/13 13:07, Darren Hart wrote:
> On Thu, 2013-12-19 at 13:00 -0800, Davidlohr Bueso wrote:
>> On Thu, 2013-12-19 at 12:51 -0800, Randy Dunlap wrote:
>>> On 12/19/13 12:45, Davidlohr Bueso wrote:
>>>> From: Thomas Gleixner <tglx@...utronix.de>
>>>>
>>>> That's essential, if you want to hack on futexes.
>>>>
>>>> Cc: Ingo Molnar <mingo@...nel.org>
>>>> Cc: Darren Hart <dvhart@...ux.intel.com>
>>>> Acked-by: Peter Zijlstra <peterz@...radead.org>
>>>> Cc: Thomas Gleixner <tglx@...utronix.de>
>>>> Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
>>>> Cc: Mike Galbraith <efault@....de>
>>>> Cc: Jeff Mahoney <jeffm@...e.com>
>>>> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
>>>> Cc: Scott Norton <scott.norton@...com>
>>>> Cc: Tom Vaden <tom.vaden@...com>
>>>> Cc: Aswin Chandramouleeswaran <aswin@...com>
>>>> Cc: Waiman Long <Waiman.Long@...com>
>>>> Cc: Jason Low <jason.low2@...com>
>>>> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
>>>> Signed-off-by: Davidlohr Bueso <davidlohr@...com>
>>>> ---
>>>>  kernel/futex.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>>>>  1 file changed, 57 insertions(+)
>>>>
>>>> diff --git a/kernel/futex.c b/kernel/futex.c
>>>> index 577481d..af1fc31 100644
>>>> --- a/kernel/futex.c
>>>> +++ b/kernel/futex.c
>>>> @@ -69,6 +69,63 @@
>>>>  
>>>>  #include "locking/rtmutex_common.h"
>>>>  
>>>> +/*
>>>> + * Basic futex operation and ordering guarantees:
>>>> + *
>>>> + * The waiter reads the futex value in user space and calls
>>>> + * futex_wait(). It computes the hash bucket and acquires the hash
>>>
>>> does                It
>>> refer to "the waiter" or to futex_wait()?
>>> I read it as referring to the waiter, but ISTM that the comments are using It
>>> to refer to futex_wait()... ???
>>>
>>
>> Yes, it refers to futex_wait(), which IMO in a futex context is pretty
>> clear.
> 
> 
> Agreed.
> 
> 

I'll just have to get by with disagreeing with both of you then.
I say that the pronoun's antecedent is ambiguous (unclear).

-- 
~Randy
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