Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6: (26 commits)
PM: Make suspend_device() static
PCI ACPI: Fix comment describing acpi_pci_choose_state
Hibernation: Handle DEBUG_PAGEALLOC on x86
ACPI: fix build warning
ACPI: TSC breaks atkbd suspend
ACPI: remove is_processor_present prototype
acer-wmi: Add DMI match for mail LED on Acer TravelMate 4200 series
ACPI: sparse fix, replace macro with static function
ACPI: thinkpad-acpi: add tablet-mode reporting
ACPI: thinkpad-acpi: minor hotkey_radio_sw fixes
ACPI: thinkpad-acpi: improve thinkpad-acpi input device documentation
ACPI: thinkpad-acpi: issue input events for tablet swivel events
ACPI: thinkpad-acpi: make the video output feature optional
ACPI: thinkpad-acpi: synchronize input device switches
ACPI: thinkpad-acpi: always track input device open/close
ACPI: thinkpad-acpi: trivial fix to documentation
ACPI: thinkpad-acpi: trivial fix to module_desc typo
intel_menlo: extract return values using PTR_ERR
ACPI video: check for error from thermal_cooling_device_register
ACPI thermal: extract return values using PTR_ERR
...

Documentation/laptops/thinkpad-acpi.txt

···
 procfs: /proc/acpi/ibm/hotkey
 sysfs device attribute: hotkey_*
 
-In a ThinkPad, the ACPI HKEY handler is responsible for comunicating
+In a ThinkPad, the ACPI HKEY handler is responsible for communicating
 some important events and also keyboard hot key presses to the operating
 system.  Enabling the hotkey functionality of thinkpad-acpi signals the
 firmware that such a driver is present, and modifies how the ThinkPad
···
 modified do anything.  Not all hot keys can be individually controlled
 by the mask.  Some models do not support the mask at all, and in those
 models, hot keys cannot be controlled individually.  The behaviour of
-the mask is, therefore, higly dependent on the ThinkPad model.
+the mask is, therefore, highly dependent on the ThinkPad model.
 
 Note that unmasking some keys prevents their default behavior.  For
 example, if Fn+F5 is unmasked, that key will no longer enable/disable
···
 		in ACPI event mode, volume up/down/mute are reported as
 		separate events, but this behaviour may be corrected in
 		future releases of this driver, in which case the
-		ThinkPad volume mixer user interface semanthics will be
+		ThinkPad volume mixer user interface semantics will be
 		enforced.
 
 	hotkey_poll_freq:
···
 		The recommended polling frequency is 10Hz.
 
 	hotkey_radio_sw:
-		if the ThinkPad has a hardware radio switch, this
+		If the ThinkPad has a hardware radio switch, this
 		attribute will read 0 if the switch is in the "radios
-		disabled" postition, and 1 if the switch is in the
+		disabled" position, and 1 if the switch is in the
 		"radios enabled" position.
+
+		This attribute has poll()/select() support.
+
+	hotkey_tablet_mode:
+		If the ThinkPad has tablet capabilities, this attribute
+		will read 0 if the ThinkPad is in normal mode, and
+		1 if the ThinkPad is in tablet mode.
 
 		This attribute has poll()/select() support.
 
···
 	wakeup_hotunplug_complete:
 		Set to 1 if the system was waken up because of an
 		undock or bay ejection request, and that request
-		was sucessfully completed.  At this point, it might
+		was successfully completed.  At this point, it might
 		be useful to send the system back to sleep, at the
 		user's choice.  Refer to HKEY events 0x4003 and
 		0x3003, below.
···
 				Lenovo: battery
 
 0x1004	0x03	FN+F4		Sleep button (ACPI sleep button
-				semanthics, i.e. sleep-to-RAM).
+				semantics, i.e. sleep-to-RAM).
 				It is always generate some kind
 				of event, either the hot key
 				event or a ACPI sleep button
···
 				time passes.
 
 0x1005	0x04	FN+F5		Radio.  Enables/disables
-				the internal BlueTooth hardware
+				the internal Bluetooth hardware
 				and W-WAN card if left in control
 				of the firmware.  Does not affect
 				the WLAN card.
 				Should be used to turn on/off all
-				radios (bluetooth+W-WAN+WLAN),
+				radios (Bluetooth+W-WAN+WLAN),
 				really.
 
 0x1006	0x05	FN+F6		-
···
 				Do you feel lucky today?
 
 0x1008	0x07	FN+F8		IBM: toggle screen expand
-				Lenovo: configure ultranav
+				Lenovo: configure UltraNav
 
 0x1009	0x08	FN+F9		-
 	..	..		..
···
 0x1011	0x10	FN+END		Brightness down.  See brightness
 				up for details.
 
-0x1012	0x11	FN+PGUP		Thinklight toggle.  This key is
+0x1012	0x11	FN+PGUP		ThinkLight toggle.  This key is
 				always handled by the firmware,
 				even when unmasked.
 
···
 				key is always handled by the
 				firmware, even when unmasked.
 
-0x1018	0x17	THINKPAD	Thinkpad/Access IBM/Lenovo key
+0x1018	0x17	THINKPAD	ThinkPad/Access IBM/Lenovo key
 
 0x1019	0x18	unknown
 ..	..	..
···
 includes an scan code.  If a key is mapped to anything else, it will
 generate input device EV_KEY events.
 
+In addition to the EV_KEY events, thinkpad-acpi may also issue EV_SW
+events for switches:
+
+SW_RADIO	T60 and later hardare rfkill rocker switch
+SW_TABLET_MODE	Tablet ThinkPads HKEY events 0x5009 and 0x500A
+
 Non hot-key ACPI HKEY event map:
 0x5001		Lid closed
 0x5002		Lid opened
+0x5009		Tablet swivel: switched to tablet mode
+0x500A		Tablet swivel: switched to normal mode
 0x7000		Radio Switch may have changed state
 
 The above events are not propagated by the driver, except for legacy
···
 
 0x3003		Bay ejection (see 0x2x05) complete, can sleep again
 0x4003		Undocked (see 0x2x04), can sleep again
-0x5009		Tablet swivel: switched to tablet mode
-0x500A		Tablet swivel: switched to normal mode
-0x500B		Tablet pen insterted into its storage bay
+0x500B		Tablet pen inserted into its storage bay
 0x500C		Tablet pen removed from its storage bay
 0x5010		Brightness level changed (newer Lenovo BIOSes)
 
···
 If the hotkey_report_mode module parameter is set to 1 or 2, it cannot
 be changed later through sysfs (any writes will return -EPERM to signal
 that hotkey_report_mode was locked.  On 2.6.23 and later, where
-hotkey_report_mode cannot be changed at all, writes will return -EACES).
+hotkey_report_mode cannot be changed at all, writes will return -EACCES).
 
 hotkey_report_mode set to 1 makes the driver export through the procfs
 ACPI event interface all hot key presses (which are *also* sent to the
···
 		0: disables Bluetooth / Bluetooth is disabled
 		1: enables Bluetooth / Bluetooth is enabled.
 
-	Note: this interface will be probably be superseeded by the
+	Note: this interface will be probably be superseded by the
 	generic rfkill class, so it is NOT to be considered stable yet.
 
 Video output control -- /proc/acpi/ibm/video
···
 	1 - Related to "Volume up" key press
 	2 - Related to "Mute on" key press
 	3 - Related to "Access IBM" key press
-	4 - Related to "LCD brightness up" key pess
+	4 - Related to "LCD brightness up" key press
 	5 - Related to "LCD brightness down" key press
 	11 - Related to "toggle screen expansion" key press/function
 	12 - Related to "ThinkLight on"
 	13 - Related to "ThinkLight off"
-	14 - Related to "ThinkLight" key press (toggle thinklight)
+	14 - Related to "ThinkLight" key press (toggle ThinkLight)
 
 The cmos command interface is prone to firmware split-brain problems, as
 in newer ThinkPads it is just a compatibility layer.  Do not use it, it is
···
 EC and CMOS.  To select which one should be used, use the
 brightness_mode module parameter: brightness_mode=1 selects EC mode,
 brightness_mode=2 selects CMOS mode, brightness_mode=3 selects both EC
-and CMOS.  The driver tries to autodetect which interface to use.
+and CMOS.  The driver tries to auto-detect which interface to use.
 
 When display backlight brightness controls are available through the
 standard ACPI interface, it is best to use it instead of this direct
···
 This feature shows the presence and current state of a W-WAN (Sierra
 Wireless EV-DO) device.
 
-It was tested on a Lenovo Thinkpad X60. It should probably work on other
-Thinkpad models which come with this module installed.
+It was tested on a Lenovo ThinkPad X60. It should probably work on other
+ThinkPad models which come with this module installed.
 
 Procfs notes:
 
···
 		0: disables WWAN card / WWAN card is disabled
 		1: enables WWAN card / WWAN card is enabled.
 
-	Note: this interface will be probably be superseeded by the
+	Note: this interface will be probably be superseded by the
 	generic rfkill class, so it is NOT to be considered stable yet.
 
 Multiple Commands, Module Parameters
···
 The module takes a debug parameter which can be used to selectively
 enable various classes of debugging output, for example:
 
-	 modprobe ibm_acpi debug=0xffff
+	 modprobe thinkpad_acpi debug=0xffff
 
 will enable all debugging output classes.  It takes a bitmask, so
 to enable more than one output class, just add their values.
···
 		NVRAM is compiled out by the user because it is
 		unneeded/undesired in the first place).
 0x020101:	Marker for thinkpad-acpi with hot key NVRAM polling
-		and proper hotkey_mask semanthics (version 8 of the
+		and proper hotkey_mask semantics (version 8 of the
 		NVRAM polling patch).  Some development snapshots of
 		0.18 had an earlier version that did strange things
 		to hotkey_mask.

arch/x86/mm/pageattr.c

···
 	 */
 	cpa_fill_pool();
 }
-#endif
+
+#ifdef CONFIG_HIBERNATION
+
+bool kernel_page_present(struct page *page)
+{
+	unsigned int level;
+	pte_t *pte;
+
+	if (PageHighMem(page))
+		return false;
+
+	pte = lookup_address((unsigned long)page_address(page), &level);
+	return (pte_val(*pte) & _PAGE_PRESENT);
+}
+
+#endif /* CONFIG_HIBERNATION */
+
+#endif /* CONFIG_DEBUG_PAGEALLOC */
 
 /*
  * The testcases use internal knowledge of the implementation that shouldn't

drivers/acpi/ec.c

···
 		boot_ec->command_addr = ecdt_ptr->control.address;
 		boot_ec->data_addr = ecdt_ptr->data.address;
 		boot_ec->gpe = ecdt_ptr->gpe;
-		boot_ec->handle = ACPI_ROOT_OBJECT;
+		if (ACPI_FAILURE(acpi_get_handle(NULL, ecdt_ptr->id,
+				&boot_ec->handle))) {
+			pr_info("Failed to locate handle for boot EC\n");
+			boot_ec->handle = ACPI_ROOT_OBJECT;
+		}
 	} else {
 		/* This workaround is needed only on some broken machines,
 		 * which require early EC, but fail to provide ECDT */

drivers/acpi/executer/exregion.c

···
 	acpi_status status = AE_OK;
 	struct acpi_pci_id *pci_id;
 	u16 pci_register;
+	u32 value32;
 
 	ACPI_FUNCTION_TRACE(ex_pci_config_space_handler);
 
···
 	switch (function) {
 	case ACPI_READ:
 
-		*value = 0;
 		status = acpi_os_read_pci_configuration(pci_id, pci_register,
-							value, bit_width);
+							&value32, bit_width);
+		*value = value32;
 		break;
 
 	case ACPI_WRITE:

drivers/acpi/fan.c

···
 
 	cdev = thermal_cooling_device_register("Fan", device,
 						&fan_cooling_ops);
-	if (cdev)
+	if (IS_ERR(cdev)) {
+		result = PTR_ERR(cdev);
+		goto end;
+	}
+	if (cdev) {
 		printk(KERN_INFO PREFIX
 			"%s is registered as cooling_device%d\n",
 			device->dev.bus_id, cdev->id);
-	else
-		goto end;
-	acpi_driver_data(device) = cdev;
-	result = sysfs_create_link(&device->dev.kobj, &cdev->device.kobj,
-					"thermal_cooling");
-	if (result)
-		return result;
 
-	result = sysfs_create_link(&cdev->device.kobj, &device->dev.kobj,
-                                       "device");
-        if (result)
-                return result;
+		acpi_driver_data(device) = cdev;
+		result = sysfs_create_link(&device->dev.kobj,
+					   &cdev->device.kobj,
+					   "thermal_cooling");
+		if (result)
+			return result;
+
+		result = sysfs_create_link(&cdev->device.kobj,
+					   &device->dev.kobj,
+					   "device");
+		if (result)
+			return result;
+	}
 
 	result = acpi_fan_add_fs(device);
 	if (result)

drivers/acpi/processor_core.c

···
 
 	pr->cdev = thermal_cooling_device_register("Processor", device,
 						&processor_cooling_ops);
-	if (pr->cdev)
+	if (IS_ERR(pr->cdev)) {
+		result = PTR_ERR(pr->cdev);
+		goto end;
+	}
+	if (pr->cdev) {
 		printk(KERN_INFO PREFIX
 			"%s is registered as cooling_device%d\n",
 			device->dev.bus_id, pr->cdev->id);
-	else
-		goto end;
 
-	result = sysfs_create_link(&device->dev.kobj, &pr->cdev->device.kobj,
-					"thermal_cooling");
-	if (result)
-		return result;
-	result = sysfs_create_link(&pr->cdev->device.kobj, &device->dev.kobj,
-					"device");
-	if (result)
-		return result;
+		result = sysfs_create_link(&device->dev.kobj,
+					   &pr->cdev->device.kobj,
+					   "thermal_cooling");
+		if (result)
+			return result;
+		result = sysfs_create_link(&pr->cdev->device.kobj,
+					   &device->dev.kobj,
+					   "device");
+		if (result)
+			return result;
+	}
 
 	if (pr->flags.throttling) {
 		printk(KERN_INFO PREFIX "%s [%s] (supports",
···
 
 	acpi_processor_remove_fs(device);
 
-	sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
-	sysfs_remove_link(&pr->cdev->device.kobj, "device");
-	thermal_cooling_device_unregister(pr->cdev);
-	pr->cdev = NULL;
+	if (pr->cdev) {
+		sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
+		sysfs_remove_link(&pr->cdev->device.kobj, "device");
+		thermal_cooling_device_unregister(pr->cdev);
+		pr->cdev = NULL;
+	}
 
 	processors[pr->id] = NULL;
 
···
 /****************************************************************************
  * 	Acpi processor hotplug support 				       	    *
  ****************************************************************************/
-
-static int is_processor_present(acpi_handle handle);
 
 static int is_processor_present(acpi_handle handle)
 {

drivers/acpi/processor_idle.c

···
 	return 0;
 }
 
-#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC)
+#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
 static int tsc_halts_in_c(int state)
 {
 	switch (boot_cpu_data.x86_vendor) {
···
 		/* Get end time (ticks) */
 		t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
 
-#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC)
+#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
 		/* TSC halts in C2, so notify users */
 		if (tsc_halts_in_c(ACPI_STATE_C2))
 			mark_tsc_unstable("possible TSC halt in C2");
···
 			acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0);
 		}
 
-#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC)
+#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
 		/* TSC halts in C3, so notify users */
 		if (tsc_halts_in_c(ACPI_STATE_C3))
 			mark_tsc_unstable("TSC halts in C3");
···
 	acpi_idle_do_entry(cx);
 	t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
 
-#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC)
+#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
 	/* TSC could halt in idle, so notify users */
 	if (tsc_halts_in_c(cx->type))
 		mark_tsc_unstable("TSC halts in idle");;
···
 		spin_unlock(&c3_lock);
 	}
 
-#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86_TSC)
+#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
 	/* TSC could halt in idle, so notify users */
 	if (tsc_halts_in_c(ACPI_STATE_C3))
 		mark_tsc_unstable("TSC halts in idle");

drivers/acpi/utils.c

···
 /* --------------------------------------------------------------------------
                             Object Evaluation Helpers
    -------------------------------------------------------------------------- */
+static void
+acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s)
+{
 #ifdef ACPI_DEBUG_OUTPUT
-#define acpi_util_eval_error(h,p,s) {\
-	char prefix[80] = {'\0'};\
-	struct acpi_buffer buffer = {sizeof(prefix), prefix};\
-	acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer);\
-	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluate [%s.%s]: %s\n",\
-		(char *) prefix, p, acpi_format_exception(s))); }
+	char prefix[80] = {'\0'};
+	struct acpi_buffer buffer = {sizeof(prefix), prefix};
+	acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer);
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluate [%s.%s]: %s\n",
+		(char *) prefix, p, acpi_format_exception(s)));
 #else
-#define acpi_util_eval_error(h,p,s)
+	return;
 #endif
+}
+
 acpi_status
 acpi_extract_package(union acpi_object *package,
 		     struct acpi_buffer *format, struct acpi_buffer *buffer)

drivers/acpi/video.c

···
 
 		device->cdev = thermal_cooling_device_register("LCD",
 					device->dev, &video_cooling_ops);
+		if (IS_ERR(device->cdev))
+			return;
+
 		if (device->cdev) {
 			printk(KERN_INFO PREFIX
 				"%s is registered as cooling_device%d\n",

drivers/base/power/main.c

···
  *	@dev:	Device.
  *	@state:	Power state device is entering.
  */
-int suspend_device(struct device *dev, pm_message_t state)
+static int suspend_device(struct device *dev, pm_message_t state)
 {
 	int error = 0;
 

drivers/misc/Kconfig

···
 
 	  If you are not sure, say Y here.
 
+config THINKPAD_ACPI_VIDEO
+	bool "Video output control support"
+	depends on THINKPAD_ACPI
+	default y
+	---help---
+	  Allows the thinkpad_acpi driver to provide an interface to control
+	  the various video output ports.
+
+	  This feature often won't work well, depending on ThinkPad model,
+	  display state, video output devices in use, whether there is a X
+	  server running, phase of the moon, and the current mood of
+	  Schroedinger's cat.  If you can use X.org's RandR to control
+	  your ThinkPad's video output ports instead of this feature,
+	  don't think twice: do it and say N here to save some memory.
+
+	  If you are not sure, say Y here.
+
 config THINKPAD_ACPI_HOTKEY_POLL
 	bool "Suport NVRAM polling for hot keys"
 	depends on THINKPAD_ACPI

drivers/misc/acer-wmi.c

···
 	},
 	{
 		.callback = dmi_matched,
+		.ident = "Acer TravelMate 4200",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4200"),
+		},
+		.driver_data = &quirk_acer_travelmate_2490,
+	},
+	{
+		.callback = dmi_matched,
 		.ident = "Medion MD 98300",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "MEDION"),

drivers/misc/intel_menlow.c

···
 
 	cdev = thermal_cooling_device_register("Memory controller", device,
 					       &memory_cooling_ops);
-	acpi_driver_data(device) = cdev;
-	if (!cdev)
-		result = -ENODEV;
-	else {
+	if (IS_ERR(cdev)) {
+		result = PTR_ERR(cdev);
+		goto end;
+	}
+
+	if (cdev) {
+		acpi_driver_data(device) = cdev;
 		result = sysfs_create_link(&device->dev.kobj,
 					&cdev->device.kobj, "thermal_cooling");
 		if (result)

drivers/misc/thinkpad_acpi.c

···
 	u32 hotkey:1;
 	u32 hotkey_mask:1;
 	u32 hotkey_wlsw:1;
+	u32 hotkey_tablet:1;
 	u32 light:1;
 	u32 light_status:1;
 	u32 bright_16levels:1;
···
 	   "^HKEY",		/* R30, R31 */
 	   "HKEY",		/* all others */
 	   );			/* 570 */
+
+TPACPI_HANDLE(vid, root, "\\_SB.PCI.AGP.VGA",	/* 570 */
+	   "\\_SB.PCI0.AGP0.VID0",	/* 600e/x, 770x */
+	   "\\_SB.PCI0.VID0",	/* 770e */
+	   "\\_SB.PCI0.VID",	/* A21e, G4x, R50e, X30, X40 */
+	   "\\_SB.PCI0.AGP.VID",	/* all others */
+	   );				/* R30, R31 */
 
 
 /*************************************************************************
···
 #define HOTKEY_CONFIG_CRITICAL_END
 #endif /* CONFIG_THINKPAD_ACPI_HOTKEY_POLL */
 
+/* HKEY.MHKG() return bits */
+#define TP_HOTKEY_TABLET_MASK (1 << 3)
+
 static int hotkey_get_wlsw(int *status)
 {
 	if (!acpi_evalf(hkey_handle, status, "WLSW", "d"))
 		return -EIO;
 	return 0;
+}
+
+static int hotkey_get_tablet_mode(int *status)
+{
+	int s;
+
+	if (!acpi_evalf(hkey_handle, &s, "MHKG", "d"))
+		return -EIO;
+
+	return ((s & TP_HOTKEY_TABLET_MASK) != 0);
 }
 
 /*
···
 {
 	int wlsw;
 
-	mutex_lock(&tpacpi_inputdev_send_mutex);
-
 	if (tp_features.hotkey_wlsw && !hotkey_get_wlsw(&wlsw)) {
+		mutex_lock(&tpacpi_inputdev_send_mutex);
+
 		input_report_switch(tpacpi_inputdev,
 				    SW_RADIO, !!wlsw);
 		input_sync(tpacpi_inputdev);
-	}
 
-	mutex_unlock(&tpacpi_inputdev_send_mutex);
+		mutex_unlock(&tpacpi_inputdev_send_mutex);
+	}
+}
+
+static void tpacpi_input_send_tabletsw(void)
+{
+	int state;
+
+	if (tp_features.hotkey_tablet &&
+	    !hotkey_get_tablet_mode(&state)) {
+		mutex_lock(&tpacpi_inputdev_send_mutex);
+
+		input_report_switch(tpacpi_inputdev,
+				    SW_TABLET_MODE, !!state);
+		input_sync(tpacpi_inputdev);
+
+		mutex_unlock(&tpacpi_inputdev_send_mutex);
+	}
 }
 
 static void tpacpi_input_send_key(unsigned int scancode)
···
 	mutex_unlock(&hotkey_mutex);
 }
 
+#else /* CONFIG_THINKPAD_ACPI_HOTKEY_POLL */
+
+static void hotkey_poll_setup_safe(int __unused)
+{
+}
+
+#endif /* CONFIG_THINKPAD_ACPI_HOTKEY_POLL */
+
 static int hotkey_inputdev_open(struct input_dev *dev)
 {
 	switch (tpacpi_lifecycle) {
···
 	if (tpacpi_lifecycle == TPACPI_LIFE_RUNNING)
 		hotkey_poll_setup_safe(0);
 }
-#endif /* CONFIG_THINKPAD_ACPI_HOTKEY_POLL */
 
 /* sysfs hotkey enable ------------------------------------------------- */
 static ssize_t hotkey_enable_show(struct device *dev,
···
 			     "hotkey_radio_sw");
 }
 
+/* sysfs hotkey tablet mode (pollable) --------------------------------- */
+static ssize_t hotkey_tablet_mode_show(struct device *dev,
+			   struct device_attribute *attr,
+			   char *buf)
+{
+	int res, s;
+	res = hotkey_get_tablet_mode(&s);
+	if (res < 0)
+		return res;
+
+	return snprintf(buf, PAGE_SIZE, "%d\n", !!s);
+}
+
+static struct device_attribute dev_attr_hotkey_tablet_mode =
+	__ATTR(hotkey_tablet_mode, S_IRUGO, hotkey_tablet_mode_show, NULL);
+
+static void hotkey_tablet_mode_notify_change(void)
+{
+	if (tp_features.hotkey_tablet)
+		sysfs_notify(&tpacpi_pdev->dev.kobj, NULL,
+			     "hotkey_tablet_mode");
+}
+
 /* sysfs hotkey report_mode -------------------------------------------- */
 static ssize_t hotkey_report_mode_show(struct device *dev,
 			   struct device_attribute *attr,
···
 		str_supported(tp_features.hotkey));
 
 	if (tp_features.hotkey) {
-		hotkey_dev_attributes = create_attr_set(12, NULL);
+		hotkey_dev_attributes = create_attr_set(13, NULL);
 		if (!hotkey_dev_attributes)
 			return -ENOMEM;
 		res = add_many_to_attr_set(hotkey_dev_attributes,
···
 					&dev_attr_hotkey_radio_sw.attr);
 		}
 
+		/* For X41t, X60t, X61t Tablets... */
+		if (!res && acpi_evalf(hkey_handle, &status, "MHKG", "qd")) {
+			tp_features.hotkey_tablet = 1;
+			printk(TPACPI_INFO
+				"possible tablet mode switch found; "
+				"ThinkPad in %s mode\n",
+				(status & TP_HOTKEY_TABLET_MASK)?
+					"tablet" : "laptop");
+			res = add_to_attr_set(hotkey_dev_attributes,
+					&dev_attr_hotkey_tablet_mode.attr);
+		}
+
 		if (!res)
 			res = register_attr_set_with_sysfs(
 					hotkey_dev_attributes,
···
 			set_bit(EV_SW, tpacpi_inputdev->evbit);
 			set_bit(SW_RADIO, tpacpi_inputdev->swbit);
 		}
+		if (tp_features.hotkey_tablet) {
+			set_bit(EV_SW, tpacpi_inputdev->evbit);
+			set_bit(SW_TABLET_MODE, tpacpi_inputdev->swbit);
+		}
 
 		dbg_printk(TPACPI_DBG_INIT,
 				"enabling hot key handling\n");
···
 				(hotkey_report_mode < 2) ?
 					"enabled" : "disabled");
 
-#ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
 		tpacpi_inputdev->open = &hotkey_inputdev_open;
 		tpacpi_inputdev->close = &hotkey_inputdev_close;
 
 		hotkey_poll_setup_safe(1);
-#endif
+		tpacpi_input_send_radiosw();
+		tpacpi_input_send_tabletsw();
 	}
 
 	return (tp_features.hotkey)? 0 : 1;
···
 			/* 0x5000-0x5FFF: human interface helpers */
 			switch (hkey) {
 			case 0x5010: /* Lenovo new BIOS: brightness changed */
-			case 0x5009: /* X61t: swivel up (tablet mode) */
-			case 0x500a: /* X61t: swivel down (normal mode) */
 			case 0x500b: /* X61t: tablet pen inserted into bay */
 			case 0x500c: /* X61t: tablet pen removed from bay */
+				break;
+			case 0x5009: /* X41t-X61t: swivel up (tablet mode) */
+			case 0x500a: /* X41t-X61t: swivel down (normal mode) */
+				tpacpi_input_send_tabletsw();
+				hotkey_tablet_mode_notify_change();
+				send_acpi_ev = 0;
 				break;
 			case 0x5001:
 			case 0x5002:
···
 		       "from firmware\n");
 	tpacpi_input_send_radiosw();
 	hotkey_radio_sw_notify_change();
+	hotkey_tablet_mode_notify_change();
 	hotkey_wakeup_reason_notify_change();
 	hotkey_wakeup_hotunplug_complete_notify_change();
-#ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
 	hotkey_poll_setup_safe(0);
-#endif
 }
 
 /* procfs -------------------------------------------------------------- */
···
  * Video subdriver
  */
 
+#ifdef CONFIG_THINKPAD_ACPI_VIDEO
+
 enum video_access_mode {
 	TPACPI_VIDEO_NONE = 0,
 	TPACPI_VIDEO_570,	/* 570 */
···
 
 static int video_autosw_get(void);
 static int video_autosw_set(int enable);
-
-TPACPI_HANDLE(vid, root, "\\_SB.PCI.AGP.VGA",	/* 570 */
-	   "\\_SB.PCI0.AGP0.VID0",	/* 600e/x, 770x */
-	   "\\_SB.PCI0.VID0",	/* 770e */
-	   "\\_SB.PCI0.VID",	/* A21e, G4x, R50e, X30, X40 */
-	   "\\_SB.PCI0.AGP.VID",	/* all others */
-	   );				/* R30, R31 */
 
 TPACPI_HANDLE(vid2, root, "\\_SB.PCI0.AGPB.VID");	/* G41 */
 
···
 	.write = video_write,
 	.exit = video_exit,
 };
+
+#endif /* CONFIG_THINKPAD_ACPI_VIDEO */
 
 /*************************************************************************
  * Light (thinklight) subdriver
···
 		.init = wan_init,
 		.data = &wan_driver_data,
 	},
+#ifdef CONFIG_THINKPAD_ACPI_VIDEO
 	{
 		.init = video_init,
 		.data = &video_driver_data,
 	},
+#endif
 	{
 		.init = light_init,
 		.data = &light_driver_data,
···
 
 #define TPACPI_PARAM(feature) \
 	module_param_call(feature, set_ibm_param, NULL, NULL, 0); \
-	MODULE_PARM_DESC(feature, "Simulates thinkpad-aci procfs command " \
+	MODULE_PARM_DESC(feature, "Simulates thinkpad-acpi procfs command " \
 			 "at module load, see documentation")
 
 TPACPI_PARAM(hotkey);

drivers/pci/pci-acpi.c

···
  *	choose from highest power _SxD to lowest power _SxW
  * else // no _PRW at S-state x
  * 	choose highest power _SxD or any lower power
- *
- * currently we simply return _SxD, if present.
  */
 
 static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev,

drivers/thermal/thermal.c

···
 {
 	struct thermal_cooling_device_instance *dev;
 	struct thermal_cooling_device_instance *pos;
+	struct thermal_zone_device *pos1;
+	struct thermal_cooling_device *pos2;
 	int result;
 
 	if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
 		return -EINVAL;
 
-	if (!tz || !cdev)
+	list_for_each_entry(pos1, &thermal_tz_list, node) {
+		if (pos1 == tz)
+			break;
+	}
+	list_for_each_entry(pos2, &thermal_cdev_list, node) {
+		if (pos2 == cdev)
+			break;
+	}
+
+	if (tz != pos1 || cdev != pos2)
 		return -EINVAL;
 
 	dev =
···
 	int result;
 
 	if (strlen(type) >= THERMAL_NAME_LENGTH)
-		return NULL;
+		return ERR_PTR(-EINVAL);
 
 	if (!ops || !ops->get_max_state || !ops->get_cur_state ||
 	    !ops->set_cur_state)
-		return NULL;
+		return ERR_PTR(-EINVAL);
 
 	cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
 	if (!cdev)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 
 	result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
 	if (result) {
 		kfree(cdev);
-		return NULL;
+		return ERR_PTR(result);
 	}
 
 	strcpy(cdev->type, type);
···
 	if (result) {
 		release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 		kfree(cdev);
-		return NULL;
+		return ERR_PTR(result);
 	}
 
 	/* sys I/F */
···
       unregister:
 	release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
 	device_unregister(&cdev->device);
-	return NULL;
+	return ERR_PTR(result);
 }
 
 EXPORT_SYMBOL(thermal_cooling_device_register);
···
 	int count;
 
 	if (strlen(type) >= THERMAL_NAME_LENGTH)
-		return NULL;
+		return ERR_PTR(-EINVAL);
 
 	if (trips > THERMAL_MAX_TRIPS || trips < 0)
-		return NULL;
+		return ERR_PTR(-EINVAL);
 
 	if (!ops || !ops->get_temp)
-		return NULL;
+		return ERR_PTR(-EINVAL);
 
 	tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
 	if (!tz)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 
 	INIT_LIST_HEAD(&tz->cooling_devices);
 	idr_init(&tz->idr);
···
 	result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
 	if (result) {
 		kfree(tz);
-		return NULL;
+		return ERR_PTR(result);
 	}
 
 	strcpy(tz->type, type);
···
 	if (result) {
 		release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
 		kfree(tz);
-		return NULL;
+		return ERR_PTR(result);
 	}
 
 	/* sys I/F */
···
       unregister:
 	release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
 	device_unregister(&tz->device);
-	return NULL;
+	return ERR_PTR(result);
 }
 
 EXPORT_SYMBOL(thermal_zone_device_register);

include/linux/mm.h

···
 {
 	debug_pagealloc_enabled = 1;
 }
+#ifdef CONFIG_HIBERNATION
+extern bool kernel_page_present(struct page *page);
+#endif /* CONFIG_HIBERNATION */
 #else
 static inline void
 kernel_map_pages(struct page *page, int numpages, int enable) {}
 static inline void enable_debug_pagealloc(void)
 {
 }
+#ifdef CONFIG_HIBERNATION
+static inline bool kernel_page_present(struct page *page) { return true; }
+#endif /* CONFIG_HIBERNATION */
 #endif
 
 extern struct vm_area_struct *get_gate_vma(struct task_struct *tsk);

kernel/power/snapshot.c

···
 #endif /* CONFIG_HIGHMEM */
 
 /**
- *	saveable - Determine whether a non-highmem page should be included in
- *	the suspend image.
+ *	saveable_page - Determine whether a non-highmem page should be included
+ *	in the suspend image.
  *
  *	We should save the page if it isn't Nosave, and is not in the range
  *	of pages statically defined as 'unsaveable', and it isn't a part of
···
 	if (swsusp_page_is_forbidden(page) || swsusp_page_is_free(page))
 		return NULL;
 
-	if (PageReserved(page) && pfn_is_nosave(pfn))
+	if (PageReserved(page)
+	    && (!kernel_page_present(page) || pfn_is_nosave(pfn)))
 		return NULL;
 
 	return page;
···
 		*dst++ = *src++;
 }
 
+
+/**
+ *	safe_copy_page - check if the page we are going to copy is marked as
+ *		present in the kernel page tables (this always is the case if
+ *		CONFIG_DEBUG_PAGEALLOC is not set and in that case
+ *		kernel_page_present() always returns 'true').
+ */
+static void safe_copy_page(void *dst, struct page *s_page)
+{
+	if (kernel_page_present(s_page)) {
+		do_copy_page(dst, page_address(s_page));
+	} else {
+		kernel_map_pages(s_page, 1, 1);
+		do_copy_page(dst, page_address(s_page));
+		kernel_map_pages(s_page, 1, 0);
+	}
+}
+
+
 #ifdef CONFIG_HIGHMEM
 static inline struct page *
 page_is_saveable(struct zone *zone, unsigned long pfn)
···
 			saveable_highmem_page(pfn) : saveable_page(pfn);
 }
 
-static inline void
-copy_data_page(unsigned long dst_pfn, unsigned long src_pfn)
+static void copy_data_page(unsigned long dst_pfn, unsigned long src_pfn)
 {
 	struct page *s_page, *d_page;
 	void *src, *dst;
···
 		kunmap_atomic(src, KM_USER0);
 		kunmap_atomic(dst, KM_USER1);
 	} else {
-		src = page_address(s_page);
 		if (PageHighMem(d_page)) {
 			/* Page pointed to by src may contain some kernel
 			 * data modified by kmap_atomic()
 			 */
-			do_copy_page(buffer, src);
+			safe_copy_page(buffer, s_page);
 			dst = kmap_atomic(pfn_to_page(dst_pfn), KM_USER0);
 			memcpy(dst, buffer, PAGE_SIZE);
 			kunmap_atomic(dst, KM_USER0);
 		} else {
-			dst = page_address(d_page);
-			do_copy_page(dst, src);
+			safe_copy_page(page_address(d_page), s_page);
 		}
 	}
 }
 #else
 #define page_is_saveable(zone, pfn)	saveable_page(pfn)
 
-static inline void
-copy_data_page(unsigned long dst_pfn, unsigned long src_pfn)
+static inline void copy_data_page(unsigned long dst_pfn, unsigned long src_pfn)
 {
-	do_copy_page(page_address(pfn_to_page(dst_pfn)),
-			page_address(pfn_to_page(src_pfn)));
+	safe_copy_page(page_address(pfn_to_page(dst_pfn)),
+				pfn_to_page(src_pfn));
 }
 #endif /* CONFIG_HIGHMEM */