linux-kernel - Re: [PATCH 01/51] CPU hotplug: Provide lockless versions of callback registration functions

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Message-ID: <20140210172751.GA30766@balbir-System-Product-Name>
Date:	Mon, 10 Feb 2014 22:57:51 +0530
From:	Balbir Singh <bsingharora@...il.com>
To:	Gautham R Shenoy <ego@...ux.vnet.ibm.com>
Cc:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Oleg Nesterov <oleg@...hat.com>, paulus@...ba.org,
	rusty@...tcorp.com.au, peterz@...radead.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, mingo@...nel.org,
	paulmck@...ux.vnet.ibm.com, tj@...nel.org, walken@...gle.com,
	linux@....linux.org.uk, linux-kernel@...r.kernel.org,
	Toshi Kani <toshi.kani@...com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH 01/51] CPU hotplug: Provide lockless versions of callback
 registration functions

On Mon, Feb 10, 2014 at 04:21:30PM +0530, Gautham R Shenoy wrote:
> On Mon, Feb 10, 2014 at 02:45:55PM +0530, Srivatsa S. Bhat wrote:
> 
> +	cpuhp_lock_acquire_read();
>  	mutex_lock(&cpu_hotplug.lock);

Don't you want to abstract cpuhp_lock_acquire_read and mutex_lock into a
more useful primitive. Ditto for the unlock bits - specifically if they
will always be used together.

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