C++ clear_bit函数代码示例

static int qlcnic_set_led(struct net_device *dev,
			  enum ethtool_phys_id_state state)
{
	struct qlcnic_adapter *adapter = netdev_priv(dev);
	int max_sds_rings = adapter->max_sds_rings;
	int err = -EIO, active = 1;

	if (adapter->ahw->op_mode == QLCNIC_NON_PRIV_FUNC) {
		netdev_warn(dev, "LED test not supported for non "
				"privilege function\n");
		return -EOPNOTSUPP;
	}

	switch (state) {
	case ETHTOOL_ID_ACTIVE:
		if (test_and_set_bit(__QLCNIC_LED_ENABLE, &adapter->state))
			return -EBUSY;

		if (test_bit(__QLCNIC_RESETTING, &adapter->state))
			break;

		if (!test_bit(__QLCNIC_DEV_UP, &adapter->state)) {
			if (qlcnic_diag_alloc_res(dev, QLCNIC_LED_TEST))
				break;
			set_bit(__QLCNIC_DIAG_RES_ALLOC, &adapter->state);
		}

		if (adapter->nic_ops->config_led(adapter, 1, 0xf) == 0) {
			err = 0;
			break;
		}

		dev_err(&adapter->pdev->dev,
			"Failed to set LED blink state.\n");
		break;

	case ETHTOOL_ID_INACTIVE:
		active = 0;

		if (test_bit(__QLCNIC_RESETTING, &adapter->state))
			break;

		if (!test_bit(__QLCNIC_DEV_UP, &adapter->state)) {
			if (qlcnic_diag_alloc_res(dev, QLCNIC_LED_TEST))
				break;
			set_bit(__QLCNIC_DIAG_RES_ALLOC, &adapter->state);
		}

		if (adapter->nic_ops->config_led(adapter, 0, 0xf))
			dev_err(&adapter->pdev->dev,
				"Failed to reset LED blink state.\n");

		break;

	default:
		return -EINVAL;
	}

	if (test_and_clear_bit(__QLCNIC_DIAG_RES_ALLOC, &adapter->state))
		qlcnic_diag_free_res(dev, max_sds_rings);

	if (!active || err)
		clear_bit(__QLCNIC_LED_ENABLE, &adapter->state);

	return err;
}

void __destroy_context(unsigned long ctx)
{
	clear_bit(ctx, context_map);
}

static void enable_lguest_irq(unsigned int irq)
{
	clear_bit(irq, lguest_data.blocked_interrupts);
}

/***************************************
 * bt_close - close handle to the device
 ***************************************/
static int bt_close(struct hci_dev *hdev)
{
	PRIN_LOG("HCI PAL: bt_close - enter\n");
	clear_bit(HCI_RUNNING, &hdev->flags);
	return 0;
}

static int start_usb_playback(struct ua101 *ua)
{
	unsigned int i, frames;
	struct urb *urb;
	int err = 0;

	if (test_bit(DISCONNECTED, &ua->states))
		return -ENODEV;

	if (test_bit(USB_PLAYBACK_RUNNING, &ua->states))
		return 0;

	kill_stream_urbs(&ua->playback);
	tasklet_kill(&ua->playback_tasklet);

	err = enable_iso_interface(ua, INTF_PLAYBACK);
	if (err < 0)
		return err;

	clear_bit(PLAYBACK_URB_COMPLETED, &ua->states);
	ua->playback.urbs[0]->urb.complete =
		first_playback_urb_complete;
	spin_lock_irq(&ua->lock);
	INIT_LIST_HEAD(&ua->ready_playback_urbs);
	spin_unlock_irq(&ua->lock);

	/*
	 * We submit the initial URBs all at once, so we have to wait for the
	 * packet size FIFO to be full.
	 */
	wait_event(ua->rate_feedback_wait,
		   ua->rate_feedback_count >= ua->playback.queue_length ||
		   !test_bit(USB_CAPTURE_RUNNING, &ua->states) ||
		   test_bit(DISCONNECTED, &ua->states));
	if (test_bit(DISCONNECTED, &ua->states)) {
		stop_usb_playback(ua);
		return -ENODEV;
	}
	if (!test_bit(USB_CAPTURE_RUNNING, &ua->states)) {
		stop_usb_playback(ua);
		return -EIO;
	}

	for (i = 0; i < ua->playback.queue_length; ++i) {
		/* all initial URBs contain silence */
		spin_lock_irq(&ua->lock);
		frames = ua->rate_feedback[ua->rate_feedback_start];
		add_with_wraparound(ua, &ua->rate_feedback_start, 1);
		ua->rate_feedback_count--;
		spin_unlock_irq(&ua->lock);
		urb = &ua->playback.urbs[i]->urb;
		urb->iso_frame_desc[0].length =
			frames * ua->playback.frame_bytes;
		memset(urb->transfer_buffer, 0,
		       urb->iso_frame_desc[0].length);
	}

	set_bit(USB_PLAYBACK_RUNNING, &ua->states);
	err = submit_stream_urbs(ua, &ua->playback);
	if (err < 0)
		stop_usb_playback(ua);
	return err;
}

/**
 * Return the data stream that will be used
 */
int select_data_stream(FF_PKT *ff_pkt, bool compatible)
{
    int stream;

    /* This is a plugin special restore object */
    if (ff_pkt->type == FT_RESTORE_FIRST) {
        clear_all_bits(FO_MAX, ff_pkt->flags);
        return STREAM_FILE_DATA;
    }

    /*
     * Fix all incompatible options
     */

    /**
     * No sparse option for encrypted data
     */
    if (bit_is_set(FO_ENCRYPT, ff_pkt->flags)) {
        clear_bit(FO_SPARSE, ff_pkt->flags);
    }

    /*
     * Note, no sparse option for win32_data
     */
    if (!is_portable_backup(&ff_pkt->bfd)) {
        stream = STREAM_WIN32_DATA;
        clear_bit(FO_SPARSE, ff_pkt->flags);
    } else if (bit_is_set(FO_SPARSE, ff_pkt->flags)) {
        stream = STREAM_SPARSE_DATA;
    } else {
        stream = STREAM_FILE_DATA;
    }
    if (bit_is_set(FO_OFFSETS, ff_pkt->flags)) {
        stream = STREAM_SPARSE_DATA;
    }

    /*
     * Encryption is only supported for file data
     */
    if (stream != STREAM_FILE_DATA &&
            stream != STREAM_WIN32_DATA &&
            stream != STREAM_MACOS_FORK_DATA) {
        clear_bit(FO_ENCRYPT, ff_pkt->flags);
    }

    /*
     * Compression is not supported for Mac fork data
     */
    if (stream == STREAM_MACOS_FORK_DATA) {
        clear_bit(FO_COMPRESS, ff_pkt->flags);
    }

    /*
     * Handle compression and encryption options
     */
    if (bit_is_set(FO_COMPRESS, ff_pkt->flags)) {
        if (compatible && ff_pkt->Compress_algo == COMPRESS_GZIP) {
            switch (stream) {
            case STREAM_WIN32_DATA:
                stream = STREAM_WIN32_GZIP_DATA;
                break;
            case STREAM_SPARSE_DATA:
                stream = STREAM_SPARSE_GZIP_DATA;
                break;
            case STREAM_FILE_DATA:
                stream = STREAM_GZIP_DATA;
                break;
            default:
                /**
                 * All stream types that do not support compression should clear out
                 * FO_COMPRESS above, and this code block should be unreachable.
                 */
                ASSERT(!bit_is_set(FO_COMPRESS, ff_pkt->flags));
                return STREAM_NONE;
            }
        } else {
            switch (stream) {
            case STREAM_WIN32_DATA:
                stream = STREAM_WIN32_COMPRESSED_DATA;
                break;
            case STREAM_SPARSE_DATA:
                stream = STREAM_SPARSE_COMPRESSED_DATA;
                break;
            case STREAM_FILE_DATA:
                stream = STREAM_COMPRESSED_DATA;
                break;
            default:
                /*
                 * All stream types that do not support compression should clear out
                 * FO_COMPRESS above, and this code block should be unreachable.
                 */
                ASSERT(!bit_is_set(FO_COMPRESS, ff_pkt->flags));
                return STREAM_NONE;
            }
        }
    }

//.........这里部分代码省略.........

static int
startup(struct async_struct *info)
{
	unsigned long flags;
	int	retval=0;
	irqreturn_t (*handler)(int, void *, struct pt_regs *);
	struct serial_state *state= info->state;
	unsigned long page;

	page = get_zeroed_page(GFP_KERNEL);
	if (!page)
		return -ENOMEM;

	local_irq_save(flags);

	if (info->flags & ASYNC_INITIALIZED) {
		free_page(page);
		goto errout;
	}

	if (!state->port || !state->type) {
		if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags);
		free_page(page);
		goto errout;
	}
	if (info->xmit.buf)
		free_page(page);
	else
		info->xmit.buf = (unsigned char *) page;

#ifdef SIMSERIAL_DEBUG
	printk("startup: ttys%d (irq %d)...", info->line, state->irq);
#endif

	/*
	 * Allocate the IRQ if necessary
	 */
	if (state->irq && (!IRQ_ports[state->irq] ||
			  !IRQ_ports[state->irq]->next_port)) {
		if (IRQ_ports[state->irq]) {
			retval = -EBUSY;
			goto errout;
		} else
			handler = rs_interrupt_single;

		retval = request_irq(state->irq, handler, IRQ_T(info), "simserial", NULL);
		if (retval) {
			if (capable(CAP_SYS_ADMIN)) {
				if (info->tty)
					set_bit(TTY_IO_ERROR,
						&info->tty->flags);
				retval = 0;
			}
			goto errout;
		}
	}

	/*
	 * Insert serial port into IRQ chain.
	 */
	info->prev_port = 0;
	info->next_port = IRQ_ports[state->irq];
	if (info->next_port)
		info->next_port->prev_port = info;
	IRQ_ports[state->irq] = info;

	if (info->tty) clear_bit(TTY_IO_ERROR, &info->tty->flags);

	info->xmit.head = info->xmit.tail = 0;

#if 0
	/*
	 * Set up serial timers...
	 */
	timer_table[RS_TIMER].expires = jiffies + 2*HZ/100;
	timer_active |= 1 << RS_TIMER;
#endif

	/*
	 * Set up the tty->alt_speed kludge
	 */
	if (info->tty) {
		if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
			info->tty->alt_speed = 57600;
		if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
			info->tty->alt_speed = 115200;
		if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
			info->tty->alt_speed = 230400;
		if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
			info->tty->alt_speed = 460800;
	}

	info->flags |= ASYNC_INITIALIZED;
	local_irq_restore(flags);
	return 0;

errout:
	local_irq_restore(flags);
	return retval;
}

/*
 * run through the list of inodes in the FS that need
 * defragging
 */
int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info)
{
	struct inode_defrag *defrag;
	struct btrfs_root *inode_root;
	struct inode *inode;
	struct rb_node *n;
	struct btrfs_key key;
	struct btrfs_ioctl_defrag_range_args range;
	u64 first_ino = 0;
	u64 root_objectid = 0;
	int num_defrag;
	int defrag_batch = 1024;

	memset(&range, 0, sizeof(range));
	range.len = (u64)-1;

	atomic_inc(&fs_info->defrag_running);
	spin_lock(&fs_info->defrag_inodes_lock);
	while(1) {
		n = NULL;

		/* find an inode to defrag */
		defrag = btrfs_find_defrag_inode(fs_info, root_objectid,
						 first_ino, &n);
		if (!defrag) {
			if (n) {
				defrag = rb_entry(n, struct inode_defrag,
						  rb_node);
			} else if (root_objectid || first_ino) {
				root_objectid = 0;
				first_ino = 0;
				continue;
			} else {
				break;
			}
		}

		/* remove it from the rbtree */
		first_ino = defrag->ino + 1;
		root_objectid = defrag->root;
		rb_erase(&defrag->rb_node, &fs_info->defrag_inodes);

		if (btrfs_fs_closing(fs_info))
			goto next_free;

		spin_unlock(&fs_info->defrag_inodes_lock);

		/* get the inode */
		key.objectid = defrag->root;
		btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
		key.offset = (u64)-1;
		inode_root = btrfs_read_fs_root_no_name(fs_info, &key);
		if (IS_ERR(inode_root))
			goto next;

		key.objectid = defrag->ino;
		btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
		key.offset = 0;

		inode = btrfs_iget(fs_info->sb, &key, inode_root, NULL);
		if (IS_ERR(inode))
			goto next;

		/* do a chunk of defrag */
		clear_bit(BTRFS_INODE_IN_DEFRAG, &BTRFS_I(inode)->runtime_flags);
		range.start = defrag->last_offset;
		num_defrag = btrfs_defrag_file(inode, NULL, &range, defrag->transid,
					       defrag_batch);
		/*
		 * if we filled the whole defrag batch, there
		 * must be more work to do.  Queue this defrag
		 * again
		 */
		if (num_defrag == defrag_batch) {
			defrag->last_offset = range.start;
			__btrfs_add_inode_defrag(inode, defrag);
			/*
			 * we don't want to kfree defrag, we added it back to
			 * the rbtree
			 */
			defrag = NULL;
		} else if (defrag->last_offset && !defrag->cycled) {
			/*
			 * we didn't fill our defrag batch, but
			 * we didn't start at zero.  Make sure we loop
			 * around to the start of the file.
			 */
			defrag->last_offset = 0;
			defrag->cycled = 1;
			__btrfs_add_inode_defrag(inode, defrag);
			defrag = NULL;
		}

		iput(inode);
next:
		spin_lock(&fs_info->defrag_inodes_lock);
//.........这里部分代码省略.........

static int clamp_thread(void *arg)
{
	int cpunr = (unsigned long)arg;
	DEFINE_TIMER(wakeup_timer, noop_timer, 0, 0);
	static const struct sched_param param = {
		.sched_priority = MAX_USER_RT_PRIO/2,
	};
	unsigned int count = 0;
	unsigned int target_ratio;

	set_bit(cpunr, cpu_clamping_mask);
	set_freezable();
	init_timer_on_stack(&wakeup_timer);
	sched_setscheduler(current, SCHED_FIFO, &param);

	while (true == clamping && !kthread_should_stop() &&
		cpu_online(cpunr)) {
		int sleeptime;
		unsigned long target_jiffies;
		unsigned int guard;
		unsigned int compensation = 0;
		int interval; /* jiffies to sleep for each attempt */
		unsigned int duration_jiffies = msecs_to_jiffies(duration);
		unsigned int window_size_now;

		try_to_freeze();
		/*
		 * make sure user selected ratio does not take effect until
		 * the next round. adjust target_ratio if user has changed
		 * target such that we can converge quickly.
		 */
		target_ratio = set_target_ratio;
		guard = 1 + target_ratio/20;
		window_size_now = window_size;
		count++;

		/*
		 * systems may have different ability to enter package level
		 * c-states, thus we need to compensate the injected idle ratio
		 * to achieve the actual target reported by the HW.
		 */
		compensation = get_compensation(target_ratio);
		interval = duration_jiffies*100/(target_ratio+compensation);

		/* align idle time */
		target_jiffies = roundup(jiffies, interval);
		sleeptime = target_jiffies - jiffies;
		if (sleeptime <= 0)
			sleeptime = 1;
		schedule_timeout_interruptible(sleeptime);
		/*
		 * only elected controlling cpu can collect stats and update
		 * control parameters.
		 */
		if (cpunr == control_cpu && !(count%window_size_now)) {
			should_skip =
				powerclamp_adjust_controls(target_ratio,
							guard, window_size_now);
			smp_mb();
		}

		if (should_skip)
			continue;

		target_jiffies = jiffies + duration_jiffies;
		mod_timer(&wakeup_timer, target_jiffies);
		if (unlikely(local_softirq_pending()))
			continue;
		/*
		 * stop tick sched during idle time, interrupts are still
		 * allowed. thus jiffies are updated properly.
		 */
		preempt_disable();
		tick_nohz_idle_enter();
		/* mwait until target jiffies is reached */
		while (time_before(jiffies, target_jiffies)) {
			unsigned long ecx = 1;
			unsigned long eax = target_mwait;

			/*
			 * REVISIT: may call enter_idle() to notify drivers who
			 * can save power during cpu idle. same for exit_idle()
			 */
			local_touch_nmi();
			stop_critical_timings();
			mwait_idle_with_hints(eax, ecx);
			start_critical_timings();
			atomic_inc(&idle_wakeup_counter);
		}
		tick_nohz_idle_exit();
		preempt_enable_no_resched();
	}
	del_timer_sync(&wakeup_timer);
	clear_bit(cpunr, cpu_clamping_mask);

	return 0;
}

/*
 * 1 HZ polling while clamping is active, useful for userspace
//.........这里部分代码省略.........

int iwl_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
{
	int cmd_idx;
	int ret;

	BUG_ON(cmd->flags & CMD_ASYNC);

	 /* A synchronous command can not have a callback set. */
	BUG_ON(cmd->callback);

	IWL_DEBUG_INFO(priv, "Attempting to send sync command %s\n",
			get_cmd_string(cmd->id));
	mutex_lock(&priv->sync_cmd_mutex);

	set_bit(STATUS_HCMD_ACTIVE, &priv->status);
	IWL_DEBUG_INFO(priv, "Setting HCMD_ACTIVE for command %s\n",
			get_cmd_string(cmd->id));

	cmd_idx = iwl_enqueue_hcmd(priv, cmd);
	if (cmd_idx < 0) {
		ret = cmd_idx;
		IWL_ERR(priv, "Error sending %s: enqueue_hcmd failed: %d\n",
			  get_cmd_string(cmd->id), ret);
		goto out;
	}

	ret = wait_event_interruptible_timeout(priv->wait_command_queue,
			!test_bit(STATUS_HCMD_ACTIVE, &priv->status),
			HOST_COMPLETE_TIMEOUT);
	if (!ret) {
		if (test_bit(STATUS_HCMD_ACTIVE, &priv->status)) {
			IWL_ERR(priv,
				"Error sending %s: time out after %dms.\n",
				get_cmd_string(cmd->id),
				jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));

			clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
			IWL_DEBUG_INFO(priv, "Clearing HCMD_ACTIVE for command %s\n",
				       get_cmd_string(cmd->id));
			ret = -ETIMEDOUT;
			goto cancel;
		}
	}

	if (test_bit(STATUS_RF_KILL_HW, &priv->status)) {
		IWL_ERR(priv, "Command %s aborted: RF KILL Switch\n",
			       get_cmd_string(cmd->id));
		ret = -ECANCELED;
		goto fail;
	}
	if (test_bit(STATUS_FW_ERROR, &priv->status)) {
		IWL_ERR(priv, "Command %s failed: FW Error\n",
			       get_cmd_string(cmd->id));
		ret = -EIO;
		goto fail;
	}
	if ((cmd->flags & CMD_WANT_SKB) && !cmd->reply_page) {
		IWL_ERR(priv, "Error: Response NULL in '%s'\n",
			  get_cmd_string(cmd->id));
		ret = -EIO;
		goto cancel;
	}

	ret = 0;
	goto out;

cancel:
	if (cmd->flags & CMD_WANT_SKB) {
		/*
		 * Cancel the CMD_WANT_SKB flag for the cmd in the
		 * TX cmd queue. Otherwise in case the cmd comes
		 * in later, it will possibly set an invalid
		 * address (cmd->meta.source).
		 */
		priv->txq[IWL_CMD_QUEUE_NUM].meta[cmd_idx].flags &=
							~CMD_WANT_SKB;
	}
fail:
	if (cmd->reply_page) {
		iwl_free_pages(priv, cmd->reply_page);
		cmd->reply_page = 0;
	}
out:
	mutex_unlock(&priv->sync_cmd_mutex);
	return ret;
}

static long wdog_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	void __user *argp = (void __user *)arg;
	int __user *p = argp;
	int new_heartbeat;
	int status;
	int options;
	uint32_t remaining;

	struct watchdog_info ident = {
		.options =		WDIOF_SETTIMEOUT|
					WDIOF_MAGICCLOSE|
					WDIOF_KEEPALIVEPING,
		.firmware_version =	1,
		.identity =		"BCM2708",
	};

	switch (cmd) {
	case WDIOC_GETSUPPORT:
		return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
	case WDIOC_GETSTATUS:
		status = wdog_get_status();
		return put_user(status, p);
	case WDIOC_GETBOOTSTATUS:
		return put_user(0, p);
	case WDIOC_KEEPALIVE:
		wdog_ping();
		return 0;
	case WDIOC_SETTIMEOUT:
		if (get_user(new_heartbeat, p))
			return -EFAULT;
		if (wdog_set_heartbeat(new_heartbeat))
			return -EINVAL;
		wdog_ping();
		/* Fall */
	case WDIOC_GETTIMEOUT:
		return put_user(heartbeat, p);
	case WDIOC_GETTIMELEFT:
		remaining = WDOG_TICKS_TO_SECS(wdog_get_remaining());
		return put_user(remaining, p);
	case WDIOC_SETOPTIONS:
		if (get_user(options, p))
			return -EFAULT;
		if (options & WDIOS_DISABLECARD)
			wdog_stop();
		if (options & WDIOS_ENABLECARD)
			wdog_start(wdog_ticks);
		return 0;
	default:
		return -ENOTTY;
	}
}

/**
 *	@inode: inode of device
 *	@file: file handle to device
 *
 *	The watchdog device has been opened. The watchdog device is single
 *	open and on opening we load the counters.
 */

static int wdog_open(struct inode *inode, struct file *file)
{
	if (test_and_set_bit(0, &wdog_is_open))
		return -EBUSY;
	/*
	 *	Activate
	 */
	wdog_start(wdog_ticks);
	return nonseekable_open(inode, file);
}

/**
 *	@inode: inode to board
 *	@file: file handle to board
 *
 *	The watchdog has a configurable API. There is a religious dispute
 *	between people who want their watchdog to be able to shut down and
 *	those who want to be sure if the watchdog manager dies the machine
 *	reboots. In the former case we disable the counters, in the latter
 *	case you have to open it again very soon.
 */

static int wdog_release(struct inode *inode, struct file *file)
{
	if (expect_close == 42) {
		wdog_stop();
	} else {
		printk(KERN_CRIT
		 "wdt: WDT device closed unexpectedly.  WDT will not stop!\n");
		wdog_ping();
	}
	clear_bit(0, &wdog_is_open);
	expect_close = 0;
	return 0;
}

/**
 *	@this: our notifier block
 *	@code: the event being reported
//.........这里部分代码省略.........

static int maxiradio_exclusive_release(struct file *file)
{
	clear_bit(0, &in_use);
	return 0;
}

static int wafwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
	     unsigned long arg)
{
	int new_timeout;
	void __user *argp = (void __user *)arg;
	int __user *p = argp;
	static struct watchdog_info ident = {
		.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
		.firmware_version = 1,
		.identity = "Wafer 5823 WDT",
	};

	switch (cmd) {
	case WDIOC_GETSUPPORT:
		if (copy_to_user(argp, &ident, sizeof (ident)))
			return -EFAULT;
		break;

	case WDIOC_GETSTATUS:
	case WDIOC_GETBOOTSTATUS:
		return put_user(0, p);

	case WDIOC_KEEPALIVE:
		wafwdt_ping();
		break;

	case WDIOC_SETTIMEOUT:
		if (get_user(new_timeout, p))
			return -EFAULT;
		if ((new_timeout < 1) || (new_timeout > 255))
			return -EINVAL;
		timeout = new_timeout;
		wafwdt_stop();
		wafwdt_start();
		/* Fall */
	case WDIOC_GETTIMEOUT:
		return put_user(timeout, p);

	case WDIOC_SETOPTIONS:
	{
		int options, retval = -EINVAL;

		if (get_user(options, p))
			return -EFAULT;

		if (options & WDIOS_DISABLECARD) {
			wafwdt_start();
			retval = 0;
		}

		if (options & WDIOS_ENABLECARD) {
			wafwdt_stop();
			retval = 0;
		}

		return retval;
	}

	default:
		return -ENOIOCTLCMD;
	}
	return 0;
}

static int wafwdt_open(struct inode *inode, struct file *file)
{
	if (test_and_set_bit(0, &wafwdt_is_open))
		return -EBUSY;

	/*
	 *      Activate
	 */
	wafwdt_start();
	return nonseekable_open(inode, file);
}

static int
wafwdt_close(struct inode *inode, struct file *file)
{
	if (expect_close == 42) {
		wafwdt_stop();
	} else {
		printk(KERN_CRIT PFX "WDT device closed unexpectedly.  WDT will not stop!\n");
		wafwdt_ping();
	}
	clear_bit(0, &wafwdt_is_open);
	expect_close = 0;
	return 0;
}

/*
 *	Notifier for system down
 */

static int wafwdt_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
{
	if (code == SYS_DOWN || code == SYS_HALT) {
		/* Turn the WDT off */
		wafwdt_stop();
	}
//.........这里部分代码省略.........

static int qlcnic_loopback_test(struct net_device *netdev, u8 mode)
{
	struct qlcnic_adapter *adapter = netdev_priv(netdev);
	int max_sds_rings = adapter->max_sds_rings;
	struct qlcnic_host_sds_ring *sds_ring;
	int loop = 0;
	int ret;

	if (!(adapter->ahw->capabilities &
	      QLCNIC_FW_CAPABILITY_MULTI_LOOPBACK)) {
		netdev_info(netdev, "Firmware is not loopback test capable\n");
		return -EOPNOTSUPP;
	}

	QLCDB(adapter, DRV, "%s loopback test in progress\n",
		   mode == QLCNIC_ILB_MODE ? "internal" : "external");
	if (adapter->ahw->op_mode == QLCNIC_NON_PRIV_FUNC) {
		netdev_warn(netdev, "Loopback test not supported for non "
				"privilege function\n");
		return 0;
	}

	if (test_and_set_bit(__QLCNIC_RESETTING, &adapter->state))
		return -EBUSY;

	ret = qlcnic_diag_alloc_res(netdev, QLCNIC_LOOPBACK_TEST);
	if (ret)
		goto clear_it;

	sds_ring = &adapter->recv_ctx->sds_rings[0];

	ret = qlcnic_set_lb_mode(adapter, mode);
	if (ret)
		goto free_res;

	adapter->ahw->diag_cnt = 0;
	do {
		msleep(500);
		qlcnic_process_rcv_ring_diag(sds_ring);
		if (loop++ > QLCNIC_ILB_MAX_RCV_LOOP) {
			netdev_info(netdev, "firmware didnt respond to loopback"
				" configure request\n");
			ret = -QLCNIC_FW_NOT_RESPOND;
			goto free_res;
		} else if (adapter->ahw->diag_cnt) {
			ret = adapter->ahw->diag_cnt;
			goto free_res;
		}
	} while (!QLCNIC_IS_LB_CONFIGURED(adapter->ahw->loopback_state));

	ret = qlcnic_do_lb_test(adapter, mode);

	qlcnic_clear_lb_mode(adapter);

 free_res:
	qlcnic_diag_free_res(netdev, max_sds_rings);

 clear_it:
	adapter->max_sds_rings = max_sds_rings;
	clear_bit(__QLCNIC_RESETTING, &adapter->state);
	return ret;
}

int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
{
	int nr = kvmppc_get_gpr(vcpu, 11);
	int r;
	unsigned long __maybe_unused param1 = kvmppc_get_gpr(vcpu, 3);
	unsigned long __maybe_unused param2 = kvmppc_get_gpr(vcpu, 4);
	unsigned long __maybe_unused param3 = kvmppc_get_gpr(vcpu, 5);
	unsigned long __maybe_unused param4 = kvmppc_get_gpr(vcpu, 6);
	unsigned long r2 = 0;

	if (!(kvmppc_get_msr(vcpu) & MSR_SF)) {
		/* 32 bit mode */
		param1 &= 0xffffffff;
		param2 &= 0xffffffff;
		param3 &= 0xffffffff;
		param4 &= 0xffffffff;
	}

	switch (nr) {
	case KVM_HCALL_TOKEN(KVM_HC_PPC_MAP_MAGIC_PAGE):
	{
#if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_KVM_BOOK3S_PR_POSSIBLE)
		/* Book3S can be little endian, find it out here */
		int shared_big_endian = true;
		if (vcpu->arch.intr_msr & MSR_LE)
			shared_big_endian = false;
		if (shared_big_endian != vcpu->arch.shared_big_endian)
			kvmppc_swab_shared(vcpu);
		vcpu->arch.shared_big_endian = shared_big_endian;
#endif

		if (!(param2 & MAGIC_PAGE_FLAG_NOT_MAPPED_NX)) {
			/*
			 * Older versions of the Linux magic page code had
			 * a bug where they would map their trampoline code
			 * NX. If that's the case, remove !PR NX capability.
			 */
			vcpu->arch.disable_kernel_nx = true;
			kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
		}

		vcpu->arch.magic_page_pa = param1 & ~0xfffULL;
		vcpu->arch.magic_page_ea = param2 & ~0xfffULL;

#ifdef CONFIG_PPC_64K_PAGES
		/*
		 * Make sure our 4k magic page is in the same window of a 64k
		 * page within the guest and within the host's page.
		 */
		if ((vcpu->arch.magic_page_pa & 0xf000) !=
		    ((ulong)vcpu->arch.shared & 0xf000)) {
			void *old_shared = vcpu->arch.shared;
			ulong shared = (ulong)vcpu->arch.shared;
			void *new_shared;

			shared &= PAGE_MASK;
			shared |= vcpu->arch.magic_page_pa & 0xf000;
			new_shared = (void*)shared;
			memcpy(new_shared, old_shared, 0x1000);
			vcpu->arch.shared = new_shared;
		}
#endif

		r2 = KVM_MAGIC_FEAT_SR | KVM_MAGIC_FEAT_MAS0_TO_SPRG7;

		r = EV_SUCCESS;
		break;
	}
	case KVM_HCALL_TOKEN(KVM_HC_FEATURES):
		r = EV_SUCCESS;
#if defined(CONFIG_PPC_BOOK3S) || defined(CONFIG_KVM_E500V2)
		r2 |= (1 << KVM_FEATURE_MAGIC_PAGE);
#endif

		/* Second return value is in r4 */
		break;
	case EV_HCALL_TOKEN(EV_IDLE):
		r = EV_SUCCESS;
		kvm_vcpu_block(vcpu);
		clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
		break;
	default:
		r = EV_UNIMPLEMENTED;
		break;
	}

	kvmppc_set_gpr(vcpu, 4, r2);

	return r;
}