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

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Message-Id: <201004292311.27400.rjw@sisk.pl>
Date:	Thu, 29 Apr 2010 23:11:27 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Arve Hjønnevåg <arve@...roid.com>
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

On Thursday 29 April 2010, Arve Hjønnevåg wrote:
> 2010/4/28 Rafael J. Wysocki <rjw@...k.pl>:
> > On Thursday 29 April 2010, Arve Hjønnevåg wrote:
> >> 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.
> >
> > Not necessarily, but why is it a mask?  It looks like a 0/1 thing would be
> > sufficient.
> 
> I may want to add a bit to print all user-space block and unblock calls.

Alternatively, you can add a new parameter for that, which I think I would prefer.

Rafael
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