linux-kernel - Re: [PATCH] CPU hotplug, freezer: Fix bugs in CPU hotplug call path

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Message-ID: <1317636215.12973.16.camel@twins>
Date:	Mon, 03 Oct 2011 12:03:35 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, pavel@....cz,
	len.brown@...el.com, mingo@...e.hu, akpm@...ux-foundation.org,
	suresh.b.siddha@...el.com, lucas.demarchi@...fusion.mobi,
	linux-pm@...ts.linux-foundation.org, rusty@...tcorp.com.au,
	vatsa@...ux.vnet.ibm.com, ashok.raj@...el.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] CPU hotplug, freezer: Fix bugs in CPU hotplug call path

On Mon, 2011-10-03 at 01:14 +0530, Srivatsa S. Bhat wrote:
> +static atomic_t tasks_frozen = ATOMIC_INIT(0);
> +
> +void set_tasks_frozen_flag(void)
> +{
> +       atomic_set(&tasks_frozen, 1);
> +}
> +
> +void clear_tasks_frozen_flag(void)
> +{
> +       atomic_set(&tasks_frozen, 0);
> +}
> +
> +int tasks_are_frozen(void)
> +{
> +       int ret;
> +       ret = atomic_read(&tasks_frozen);
> +       return ret;
> +} 

What's the point of using atomic_t here? Neither set nor read are
actually atomic ops.
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