linux-kernel - Re: [PATCH 2/8] PM: suspend_block: Add driver to access suspend blockers from user-space

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Date:	Wed, 28 Apr 2010 15:31:03 -0700
From:	Arve Hjønnevåg <arve@...roid.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Alan Stern <stern@...land.harvard.edu>,
	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>,
	Jim Collar <jim.collar@...are.net>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Avi Kivity <avi@...hat.com>, Len Brown <len.brown@...el.com>,
	Pavel Machek <pavel@....cz>, Magnus Damm <damm@...l.co.jp>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Nigel Cunningham <nigel@...onice.net>,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH 2/8] PM: suspend_block: Add driver to access suspend 
	blockers from user-space

2010/4/28 Rafael J. Wysocki <rjw@...k.pl>:
> On Wednesday 28 April 2010, Arve Hjønnevåg wrote:
>> Add a misc device, "suspend_blocker", that allows user-space processes
>> to block auto suspend. The device has ioctls to create a suspend_blocker,
>> and to block and unblock suspend. To delete the suspend_blocker, close
>> the device.
>>
>> Signed-off-by: Arve Hjønnevåg <arve@...roid.com>
> ...
>> +
>> +#include <linux/fs.h>
>> +#include <linux/miscdevice.h>
>> +#include <linux/module.h>
>> +#include <linux/uaccess.h>
>> +#include <linux/slab.h>
>> +#include <linux/suspend_blocker.h>
>> +#include <linux/suspend_block_dev.h>
>> +
>> +enum {
>> +     DEBUG_FAILURE   = BIT(0),
>> +};
>> +static int debug_mask = DEBUG_FAILURE;
>
> What's the exact purpose of this?

To show errors returned to user space. I can turn it off by default if you want.

>
>> +module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
>> +
>> +static DEFINE_MUTEX(ioctl_lock);
>> +
>> +struct user_suspend_blocker {
>> +     struct suspend_blocker  blocker;
>> +     char                    name[0];
>> +};
>
> Why is this not in a header?

It's private to this file.

>
> Rafael
> --
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-- 
Arve Hjønnevåg
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