linux-kernel - Re: [PATCH 2/3] led-triggers: use atomic kzalloc during led trigger registering

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Message-ID: <CACRpkdYvfzrdAC1vjT5WD4rk0ozpbXkPtkQpBVMv_WYhdkg7ag@mail.gmail.com>
Date:	Mon, 12 Mar 2012 20:37:44 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Bryan Wu <bryan.wu@...onical.com>
Cc:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Ming Lei <ming.lei@...onical.com>, rpurdie@...ys.net,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux@....linux.org.uk
Subject: Re: [PATCH 2/3] led-triggers: use atomic kzalloc during led trigger registering

2012/3/10 Bryan Wu <bryan.wu@...onical.com>:
> 2012/3/8 Uwe Kleine-König <u.kleine-koenig@...gutronix.de>:
>> On Thu, Mar 08, 2012 at 05:11:02PM +0800, Bryan Wu wrote:
>>> kzalloc might cause sleep and will generate some warning detected by lockdep,
>>> when call led_trigger_register_simple on each cpu cores in SMP. This patch fix
>>> this.
>> The obvious (and IMHO better) alternative is to call
>> led_trigger_register_simple from non-atomic context.
>>
>> For registering this should be OK, shouldn't it?
>>
> Thanks Uwe, it's my bad. I think I should not use on_each_cpu() API to
> run led_trigger_register_simple. on_each_cpu() will disable interrupt.

It might have been my mistake even so not your fault ... :-)

Thanks,
Linus Walleij
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