Release 4.11 drivers/input/evdev.c

/*
 * Event char devices, giving access to raw input device events.
 *
 * Copyright (c) 1999-2002 Vojtech Pavlik
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt


#define EVDEV_MINOR_BASE	64

#define EVDEV_MINORS		32

#define EVDEV_MIN_BUFFER_SIZE	64U

#define EVDEV_BUF_PACKETS	8

#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input/mt.h>
#include <linux/major.h>
#include <linux/device.h>
#include <linux/cdev.h>
#include "input-compat.h"


enum evdev_clock_type {
	
EV_CLK_REAL = 0,
	
EV_CLK_MONO,
	
EV_CLK_BOOT,
	
EV_CLK_MAX
};


struct evdev {
	
int open;
	
struct input_handle handle;
	
wait_queue_head_t wait;
	
struct evdev_client __rcu *grab;
	
struct list_head client_list;
	
spinlock_t client_lock; /* protects client_list */
	
struct mutex mutex;
	
struct device dev;
	
struct cdev cdev;
	
bool exist;
};


struct evdev_client {
	
unsigned int head;
	
unsigned int tail;
	
unsigned int packet_head; /* [future] position of the first element of next packet */
	
spinlock_t buffer_lock; /* protects access to buffer, head and tail */
	
struct fasync_struct *fasync;
	
struct evdev *evdev;
	
struct list_head node;
	
unsigned int clk_type;
	
bool revoked;
	
unsigned long *evmasks[EV_CNT];
	
unsigned int bufsize;
	
struct input_event buffer[];
};



static size_t evdev_get_mask_cnt(unsigned int type)
{
	static const size_t counts[EV_CNT] = {
		/* EV_SYN==0 is EV_CNT, _not_ SYN_CNT, see EVIOCGBIT */
		[EV_SYN]	= EV_CNT,
		[EV_KEY]	= KEY_CNT,
		[EV_REL]	= REL_CNT,
		[EV_ABS]	= ABS_CNT,
		[EV_MSC]	= MSC_CNT,
		[EV_SW]		= SW_CNT,
		[EV_LED]	= LED_CNT,
		[EV_SND]	= SND_CNT,
		[EV_FF]		= FF_CNT,
        };

	return (type < EV_CNT) ? counts[type] : 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Herrmann
89
100.00%
1
100.00%
Total
89
100.00%
1
100.00%

/* requires the buffer lock to be held */


static bool __evdev_is_filtered(struct evdev_client *client,
				unsigned int type,
				unsigned int code)
{
	unsigned long *mask;
	size_t cnt;

	/* EV_SYN and unknown codes are never filtered */
	if (type == EV_SYN || type >= EV_CNT)
		return false;

	/* first test whether the type is filtered */
	mask = client->evmasks[0];
	if (mask && !test_bit(type, mask))
		return true;

	/* unknown values are never filtered */
	cnt = evdev_get_mask_cnt(type);
	if (!cnt || code >= cnt)
		return false;

	mask = client->evmasks[type];
	return mask && !test_bit(code, mask);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Herrmann
106
100.00%
1
100.00%
Total
106
100.00%
1
100.00%

/* flush queued events of type @type, caller must hold client->buffer_lock */


static void __evdev_flush_queue(struct evdev_client *client, unsigned int type)
{
	unsigned int i, head, num;
	unsigned int mask = client->bufsize - 1;
	bool is_report;
	struct input_event *ev;

	BUG_ON(type == EV_SYN);

	head = client->tail;
	client->packet_head = client->tail;

	/* init to 1 so a leading SYN_REPORT will not be dropped */
	num = 1;

	for (i = client->tail; i != client->head; i = (i + 1) & mask) {
		ev = &client->buffer[i];
		is_report = ev->type == EV_SYN && ev->code == SYN_REPORT;

		if (ev->type == type) {
			/* drop matched entry */
			continue;
		} else if (is_report && !num) {
			/* drop empty SYN_REPORT groups */
			continue;
		} else if (head != i) {
			/* move entry to fill the gap */
			client->buffer[head].time = ev->time;
			client->buffer[head].type = ev->type;
			client->buffer[head].code = ev->code;
			client->buffer[head].value = ev->value;
		}

		num++;
		head = (head + 1) & mask;

		if (is_report) {
			num = 0;
			client->packet_head = head;
		}
	}

	client->head = head;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Herrmann
238
100.00%
1
100.00%
Total
238
100.00%
1
100.00%



static void __evdev_queue_syn_dropped(struct evdev_client *client)
{
	struct input_event ev;
	ktime_t time;

	time = client->clk_type == EV_CLK_REAL ?
			ktime_get_real() :
			client->clk_type == EV_CLK_MONO ?
				ktime_get() :
				ktime_get_boottime();

	ev.time = ktime_to_timeval(time);
	ev.type = EV_SYN;
	ev.code = SYN_DROPPED;
	ev.value = 0;

	client->buffer[client->head++] = ev;
	client->head &= client->bufsize - 1;

	if (unlikely(client->head == client->tail)) {
		/* drop queue but keep our SYN_DROPPED event */
		client->tail = (client->head - 1) & (client->bufsize - 1);
		client->packet_head = client->tail;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Herrmann
115
85.82%
1
25.00%
Aniroop Mathur
12
8.96%
1
25.00%
Thomas Gleixner
5
3.73%
1
25.00%
Dmitry Torokhov
2
1.49%
1
25.00%
Total
134
100.00%
4
100.00%



static void evdev_queue_syn_dropped(struct evdev_client *client)
{
	unsigned long flags;

	spin_lock_irqsave(&client->buffer_lock, flags);
	__evdev_queue_syn_dropped(client);
	spin_unlock_irqrestore(&client->buffer_lock, flags);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
29
72.50%
1
50.00%
David Herrmann
11
27.50%
1
50.00%
Total
40
100.00%
2
100.00%



static int evdev_set_clk_type(struct evdev_client *client, unsigned int clkid)
{
	unsigned long flags;
	unsigned int clk_type;

	switch (clkid) {

	case CLOCK_REALTIME:
		clk_type = EV_CLK_REAL;
		break;
	case CLOCK_MONOTONIC:
		clk_type = EV_CLK_MONO;
		break;
	case CLOCK_BOOTTIME:
		clk_type = EV_CLK_BOOT;
		break;
	default:
		return -EINVAL;
	}

	if (client->clk_type != clk_type) {
		client->clk_type = clk_type;

		/*
                 * Flush pending events and queue SYN_DROPPED event,
                 * but only if the queue is not empty.
                 */
		spin_lock_irqsave(&client->buffer_lock, flags);

		if (client->head != client->tail) {
			client->packet_head = client->head = client->tail;
			__evdev_queue_syn_dropped(client);
		}

		spin_unlock_irqrestore(&client->buffer_lock, flags);
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Anshul Garg
59
46.46%
1
33.33%
Dmitry Torokhov
48
37.80%
1
33.33%
Aniroop Mathur
20
15.75%
1
33.33%
Total
127
100.00%
3
100.00%



static void __pass_event(struct evdev_client *client,
			 const struct input_event *event)
{
	client->buffer[client->head++] = *event;
	client->head &= client->bufsize - 1;

	if (unlikely(client->head == client->tail)) {
		/*
                 * This effectively "drops" all unconsumed events, leaving
                 * EV_SYN/SYN_DROPPED plus the newest event in the queue.
                 */
		client->tail = (client->head - 2) & (client->bufsize - 1);

		client->buffer[client->tail].time = event->time;
		client->buffer[client->tail].type = EV_SYN;
		client->buffer[client->tail].code = SYN_DROPPED;
		client->buffer[client->tail].value = 0;

		client->packet_head = client->tail;
	}

	if (event->type == EV_SYN && event->code == SYN_REPORT) {
		client->packet_head = client->head;
		kill_fasync(&client->fasync, SIGIO, POLL_IN);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jeff Brown
101
58.05%
2
28.57%
Dmitry Torokhov
50
28.74%
1
14.29%
Henrik Rydberg
15
8.62%
3
42.86%
Adam Jackson
8
4.60%
1
14.29%
Total
174
100.00%
7
100.00%



static void evdev_pass_values(struct evdev_client *client,
			const struct input_value *vals, unsigned int count,
			ktime_t *ev_time)
{
	struct evdev *evdev = client->evdev;
	const struct input_value *v;
	struct input_event event;
	bool wakeup = false;

	if (client->revoked)
		return;

	event.time = ktime_to_timeval(ev_time[client->clk_type]);

	/* Interrupts are disabled, just acquire the lock. */
	spin_lock(&client->buffer_lock);

	for (v = vals; v != vals + count; v++) {
		if (__evdev_is_filtered(client, v->type, v->code))
			continue;

		if (v->type == EV_SYN && v->code == SYN_REPORT) {
			/* drop empty SYN_REPORT */
			if (client->packet_head == client->head)
				continue;

			wakeup = true;
		}

		event.type = v->type;
		event.code = v->code;
		event.value = v->value;
		__pass_event(client, &event);
	}

	spin_unlock(&client->buffer_lock);

	if (wakeup)
		wake_up_interruptible(&evdev->wait);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Henrik Rydberg
126
64.29%
1
20.00%
David Herrmann
55
28.06%
2
40.00%
Jeff Brown
9
4.59%
1
20.00%
Aniroop Mathur
6
3.06%
1
20.00%
Total
196
100.00%
5
100.00%

/*
 * Pass incoming events to all connected clients.
 */


static void evdev_events(struct input_handle *handle,
			 const struct input_value *vals, unsigned int count)
{
	struct evdev *evdev = handle->private;
	struct evdev_client *client;
	ktime_t ev_time[EV_CLK_MAX];

	ev_time[EV_CLK_MONO] = ktime_get();
	ev_time[EV_CLK_REAL] = ktime_mono_to_real(ev_time[EV_CLK_MONO]);
	ev_time[EV_CLK_BOOT] = ktime_mono_to_any(ev_time[EV_CLK_MONO],
						 TK_OFFS_BOOT);

	rcu_read_lock();

	client = rcu_dereference(evdev->grab);

	if (client)
		evdev_pass_values(client, vals, count, ev_time);
	else
		list_for_each_entry_rcu(client, &evdev->client_list, node)
			evdev_pass_values(client, vals, count, ev_time);

	rcu_read_unlock();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Aniroop Mathur
33
25.98%
1
10.00%
Linus Torvalds (pre-git)
29
22.83%
1
10.00%
Dmitry Torokhov
23
18.11%
3
30.00%
Henrik Rydberg
16
12.60%
1
10.00%
Zephaniah E. Hull
11
8.66%
1
10.00%
John Stultz
9
7.09%
1
10.00%
Vojtech Pavlik
5
3.94%
1
10.00%
Thomas Gleixner
1
0.79%
1
10.00%
Total
127
100.00%
10
100.00%

/*
 * Pass incoming event to all connected clients.
 */


static void evdev_event(struct input_handle *handle,
			unsigned int type, unsigned int code, int value)
{
	struct input_value vals[] = { { type, code, value } };

	evdev_events(handle, vals, 1);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Henrik Rydberg
40
86.96%
1
33.33%
Linus Torvalds (pre-git)
4
8.70%
1
33.33%
Dmitry Torokhov
2
4.35%
1
33.33%
Total
46
100.00%
3
100.00%



static int evdev_fasync(int fd, struct file *file, int on)
{
	struct evdev_client *client = file->private_data;

	return fasync_helper(fd, file, on, &client->fasync);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
37
90.24%
1
33.33%
Dmitry Torokhov
3
7.32%
1
33.33%
Jonathan Corbet
1
2.44%
1
33.33%
Total
41
100.00%
3
100.00%



static int evdev_flush(struct file *file, fl_owner_t id)
{
	struct evdev_client *client = file->private_data;
	struct evdev *evdev = client->evdev;

	mutex_lock(&evdev->mutex);

	if (evdev->exist && !client->revoked)
		input_flush_device(&evdev->handle, file);

	mutex_unlock(&evdev->mutex);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
32
44.44%
2
28.57%
Vojtech Pavlik
30
41.67%
2
28.57%
Takashi Iwai
4
5.56%
1
14.29%
David Herrmann
3
4.17%
1
14.29%
Miklos Szeredi
3
4.17%
1
14.29%
Total
72
100.00%
7
100.00%



static void evdev_free(struct device *dev)
{
	struct evdev *evdev = container_of(dev, struct evdev, dev);

	input_put_device(evdev->handle.dev);
	kfree(evdev);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
32
80.00%
3
75.00%
Christoph Hellwig
8
20.00%
1
25.00%
Total
40
100.00%
4
100.00%

/*
 * Grabs an event device (along with underlying input device).
 * This function is called with evdev->mutex taken.
 */


static int evdev_grab(struct evdev *evdev, struct evdev_client *client)
{
	int error;

	if (evdev->grab)
		return -EBUSY;

	error = input_grab_device(&evdev->handle);
	if (error)
		return error;

	rcu_assign_pointer(evdev->grab, client);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
55
94.83%
1
50.00%
Christoph Hellwig
3
5.17%
1
50.00%
Total
58
100.00%
2
100.00%



static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client)
{
	struct evdev_client *grab = rcu_dereference_protected(evdev->grab,
					lockdep_is_held(&evdev->mutex));

	if (grab != client)
		return  -EINVAL;

	rcu_assign_pointer(evdev->grab, NULL);
	synchronize_rcu();
	input_release_device(&evdev->handle);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
67
97.10%
3
75.00%
Christoph Hellwig
2
2.90%
1
25.00%
Total
69
100.00%
4
100.00%



static void evdev_attach_client(struct evdev *evdev,
				struct evdev_client *client)
{
	spin_lock(&evdev->client_lock);
	list_add_tail_rcu(&client->node, &evdev->client_list);
	spin_unlock(&evdev->client_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
43
95.56%
1
50.00%
Christoph Hellwig
2
4.44%
1
50.00%
Total
45
100.00%
2
100.00%



static void evdev_detach_client(struct evdev *evdev,
				struct evdev_client *client)
{
	spin_lock(&evdev->client_lock);
	list_del_rcu(&client->node);
	spin_unlock(&evdev->client_lock);
	synchronize_rcu();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
43
100.00%
2
100.00%
Total
43
100.00%
2
100.00%



static int evdev_open_device(struct evdev *evdev)
{
	int retval;

	retval = mutex_lock_interruptible(&evdev->mutex);
	if (retval)
		return retval;

	if (!evdev->exist)
		retval = -ENODEV;
	else if (!evdev->open++) {
		retval = input_open_device(&evdev->handle);
		if (retval)
			evdev->open--;
	}

	mutex_unlock(&evdev->mutex);
	return retval;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
73
86.90%
1
50.00%
Oliver Neukum
11
13.10%
1
50.00%
Total
84
100.00%
2
100.00%



static void evdev_close_device(struct evdev *evdev)
{
	mutex_lock(&evdev->mutex);

	if (evdev->exist && !--evdev->open)
		input_close_device(&evdev->handle);

	mutex_unlock(&evdev->mutex);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
47
100.00%
1
100.00%
Total
47
100.00%
1
100.00%

/*
 * Wake up users waiting for IO so they can disconnect from
 * dead device.
 */


static void evdev_hangup(struct evdev *evdev)
{
	struct evdev_client *client;

	spin_lock(&evdev->client_lock);
	list_for_each_entry(client, &evdev->client_list, node)
		kill_fasync(&client->fasync, SIGIO, POLL_HUP);
	spin_unlock(&evdev->client_lock);

	wake_up_interruptible(&evdev->wait);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
57
95.00%
1
50.00%
Christoph Hellwig
3
5.00%
1
50.00%
Total
60
100.00%
2
100.00%



static int evdev_release(struct inode *inode, struct file *file)
{
	struct evdev_client *client = file->private_data;
	struct evdev *evdev = client->evdev;
	unsigned int i;

	mutex_lock(&evdev->mutex);
	evdev_ungrab(evdev, client);
	mutex_unlock(&evdev->mutex);

	evdev_detach_client(evdev, client);

	for (i = 0; i < EV_CNT; ++i)
		kfree(client->evmasks[i]);

	kvfree(client);

	evdev_close_device(evdev);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Herrmann
37
35.58%
1
16.67%
Dmitry Torokhov
31
29.81%
2
33.33%
Linus Torvalds (pre-git)
27
25.96%
1
16.67%
Zephaniah E. Hull
7
6.73%
1
16.67%
Vojtech Pavlik
2
1.92%
1
16.67%
Total
104
100.00%
6
100.00%



static unsigned int evdev_compute_buffer_size(struct input_dev *dev)
{
	unsigned int n_events =
		max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS,
		    EVDEV_MIN_BUFFER_SIZE);

	return roundup_pow_of_two(n_events);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Henrik Rydberg
33
100.00%
2
100.00%
Total
33
100.00%
2
100.00%



static int evdev_open(struct inode *inode, struct file *file)
{
	struct evdev *evdev = container_of(inode->i_cdev, struct evdev, cdev);
	unsigned int bufsize = evdev_compute_buffer_size(evdev->handle.dev);
	unsigned int size = sizeof(struct evdev_client) +
					bufsize * sizeof(struct input_event);
	struct evdev_client *client;
	int error;

	client = kzalloc(size, GFP_KERNEL | __GFP_NOWARN);
	if (!client)
		client = vzalloc(size);
	if (!client)
		return -ENOMEM;

	client->bufsize = bufsize;
	spin_lock_init(&client->buffer_lock);
	client->evdev = evdev;
	evdev_attach_client(evdev, client);

	error = evdev_open_device(evdev);
	if (error)
		goto err_free_client;

	file->private_data = client;
	nonseekable_open(inode, file);

	return 0;

 err_free_client:
	evdev_detach_client(evdev, client);
	kvfree(client);
	return error;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
75
42.13%
6
50.00%
Linus Torvalds (pre-git)
44
24.72%
2
16.67%
Daniel Stone
31
17.42%
1
8.33%
Henrik Rydberg
25
14.04%
1
8.33%
Vojtech Pavlik
2
1.12%
1
8.33%
Andrew Morton
1
0.56%
1
8.33%
Total
178
100.00%
12
100.00%



static ssize_t evdev_write(struct file *file, const char __user *buffer,
			   size_t count, loff_t *ppos)
{
	struct evdev_client *client = file->private_data;
	struct evdev *evdev = client->evdev;
	struct input_event event;
	int retval = 0;

	if (count != 0 && count < input_event_size())
		return -EINVAL;

	retval = mutex_lock_interruptible(&evdev->mutex);
	if (retval)
		return retval;

	if (!evdev->exist || client->revoked) {
		retval = -ENODEV;
		goto out;
	}

	while (retval + input_event_size() <= count) {

		if (input_event_from_user(buffer + retval, &event)) {
			retval = -EFAULT;
			goto out;
		}
		retval += input_event_size();

		input_inject_event(&evdev->handle,
				   event.type, event.code, event.value);
	}

 out:
	mutex_unlock(&evdev->mutex);
	return retval;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
147
84.00%
5
50.00%
Peter Korsgaard
17
9.71%
1
10.00%
Juergen Kreileder
4
2.29%
1
10.00%
David Herrmann
4
2.29%
1
10.00%
Heiko Stübner
2
1.14%
1
10.00%
Philip Langdale
1
0.57%
1
10.00%
Total
175
100.00%
10
100.00%



static int evdev_fetch_next_event(struct evdev_client *client,
				  struct input_event *event)
{
	int have_event;

	spin_lock_irq(&client->buffer_lock);

	have_event = client->packet_head != client->tail;
	if (have_event) {
		*event = client->buffer[client->tail++];
		client->tail &= client->bufsize - 1;
	}

	spin_unlock_irq(&client->buffer_lock);

	return have_event;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
73
94.81%
1
33.33%
Henrik Rydberg
3
3.90%
1
33.33%
Dima Zavin
1
1.30%
1
33.33%
Total
77
100.00%
3
100.00%



static ssize_t evdev_read(struct file *file, char __user *buffer,
			  size_t count, loff_t *ppos)
{
	struct evdev_client *client = file->private_data;
	struct evdev *evdev = client->evdev;
	struct input_event event;
	size_t read = 0;
	int error;

	if (count != 0 && count < input_event_size())
		return -EINVAL;

	for (;;) {
		if (!evdev->exist || client->revoked)
			return -ENODEV;

		if (client->packet_head == client->tail &&
		    (file->f_flags & O_NONBLOCK))
			return -EAGAIN;

		/*
                 * count == 0 is special - no IO is done but we check
                 * for error conditions (see above).
                 */
		if (count == 0)
			break;

		while (read + input_event_size() <= count &&
		       evdev_fetch_next_event(client, &event)) {

			if (input_event_to_user(buffer + read, &event))
				return -EFAULT;

			read += input_event_size();
		}

		if (read)
			break;

		if (!(file->f_flags & O_NONBLOCK)) {
			error = wait_event_interruptible(evdev->wait,
					client->packet_head != client->tail ||
					!evdev->exist || client->revoked);
			if (error)
				return error;
		}
	}

	return read;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
147
68.69%
4
36.36%
Juergen Kreileder
39
18.22%
1
9.09%
Dima Zavin
13
6.07%
2
18.18%
David Herrmann
8
3.74%
1
9.09%
Philip Langdale
4
1.87%
1
9.09%
Heiko Stübner
2
0.93%
1
9.09%
Jeff Brown
1
0.47%
1
9.09%
Total
214
100.00%
11
100.00%

/* No kernel lock - fine */


static unsigned int evdev_poll(struct file *file, poll_table *wait)
{
	struct evdev_client *client = file->private_data;
	struct evdev *evdev = client->evdev;
	unsigned int mask;

	poll_wait(file, &evdev->wait, wait);

	if (evdev->exist && !client->revoked)
		mask = POLLOUT | POLLWRNORM;
	else
		mask = POLLHUP | POLLERR;

	if (client->packet_head != client->tail)
		mask |= POLLIN | POLLRDNORM;

	return mask;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Torokhov
36
38.71%
2
33.33%
Juergen Kreileder
26
27.96%
1
16.67%
Linus Torvalds (pre-git)
16
17.20%
1
16.67%
David Herrmann
14
15.05%
1
16.67%
Jeff Brown
1
1.08%
1
16.67%
Total
93
100.00%
6
100.00%

#ifdef CONFIG_COMPAT


#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)

#define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)

#ifdef __BIG_ENDIAN


static int bits_to_user(unsigned long *bits, unsigned int maxbit,
			unsigned int maxlen, void __user *p, int compat)
{
	int len, i;

	if (compat) {
		len = BITS_TO_LONGS_COMPAT(maxbit)