linux-kernel - Re: [RFC][PATCH 4/4] Rename lock_cpu_hotplug/unlock_cpu

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Date:	Tue, 29 Aug 2006 12:31:02 -0700
From:	Paul Jackson <pj@....com>
To:	paulmck@...ibm.com
Cc:	ego@...ibm.com, mingo@...e.hu, nickpiggin@...oo.com.au,
	arjan@...radead.org, rusty@...tcorp.com.au, torvalds@...l.org,
	akpm@...l.org, linux-kernel@...r.kernel.org, arjan@...el.linux.com,
	davej@...hat.com, dipankar@...ibm.com, vatsa@...ibm.com,
	ashok.raj@...el.com
Subject: Re: [RFC][PATCH 4/4] Rename lock_cpu_hotplug/unlock_cpu_hotplug

Paul E. McKenney wrtoe:
> Can the locusts reasonably take a return value from the acquisition
> primitive and feed it to the release primitive?

Yes - the locusts typically do:

    mutex_lock(&callback_mutex);
    ... a line or two to read or write cpusets ...
    mutex_unlock(&callback_mutex);

The lock and unlock are just a few lines apart.  I could easily pass
a value from the lock (acquisition) to the unlock (release).

Why do you ask?

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@....com> 1.925.600.0401
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