netdev - Re: Documentation: rw_lock lessons learned

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Message-ID: <4AFD862E.6070105@gmail.com>
Date:	Fri, 13 Nov 2009 11:15:42 -0500
From:	William Allen Simpson <william.allen.simpson@...il.com>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
CC:	Stephen Hemminger <shemminger@...tta.com>, sclark46@...thlink.net,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Developers <linux-kernel@...r.kernel.org>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: Documentation: rw_lock lessons learned

Stefan Richter wrote:
> Stephen Hemminger wrote:
>> On Thu, 12 Nov 2009 14:13:03 -0500
>> Stephen Clark <sclark46@...thlink.net> wrote:
>>> How up to date is this doc?
>>>
>>> http://www.kernel.org/pub/linux/kernel/people/rusty/kernel-locking/index.html
>>>
>> Out of date.
>> 1. Missing mutex's which have largely replaced semaphores.
>>
>> 2. Missing change to lock initialization in later kernels.
>>
>> 3. Missing description of lock dependency checker which should be in same guide.
> 
> 4. The section on atomic reference counting should refer to <linux/kref.h>.

I'd also read that, and that's where I got some of my wrong thinking.  But
that does point to Documentation/spin_locks.txt, which I took to be
authoritative (and followed).  That's the reason spin_locks.txt should be
updated, as others are having the same problems....

Anybody have answers/updates to Linus's concerns about "pretty old and
bogus language"?

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