linux-kernel - Re: [RFC 09/15] PM / Hibernate: user, implement user

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Message-ID: <4BAA86E8.5090108@gmail.com>
Date:	Wed, 24 Mar 2010 22:40:56 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Pavel Machek <pavel@....cz>
CC:	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Nigel Cunningham <ncunningham@...a.org.au>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [RFC 09/15] PM / Hibernate: user, implement user_ops writer

On 03/24/2010 09:42 PM, Pavel Machek wrote:
>> +	if (test_bit(TODO_CLOSED, to_do_flags))
>> +		return -EIO;
>> +
>> +	to_do_buf = buf;
>> +	wmb();
>> +	set_bit(TODO_WORK, to_do_flags);
>> +	wake_up_interruptible(&to_do_wait);
> 
> Uhuh, open-coded barriers... these need to be commented, and I guess
> you just should not play this kind of trickery.

It's just to ensure the to_do_buf store is not reordered with the
set_bit. I wanted to avoid locks as too heavy tools here.

thanks,
-- 
js
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