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

Rafael J. Wysocki
2010-04-28T20:58:51Z

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@android.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?

> +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?

Rafael
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