Message-ID: <20080204234700.GA1912@elf.ucw.cz>
Date:	Tue, 5 Feb 2008 00:47:00 +0100
From:	Pavel Machek <pavel@....cz>
To:	kernel list <linux-kernel@...r.kernel.org>,
	Linux-pm mailing list <linux-pm@...ts.osdl.org>,
	Len Brown <len.brown@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Small pm documentation cleanups


Small documentation fixes/additions that accumulated in my tree.

Signed-off-by: Pavel Machek <pavel@...e.cz>

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index cf38689..3be3328 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -147,8 +147,10 @@ and is between 256 and 4096 characters. 
 			default: 0
 
 	acpi_sleep=	[HW,ACPI] Sleep options
-			Format: { s3_bios, s3_mode }
-			See Documentation/power/video.txt
+			Format: { s3_bios, s3_mode, s3_beep }
+			See Documentation/power/video.txt for s3_bios and s3_mode.
+			s3_beep is for debugging; it beeps on PC speaker as soon as
+			kernel's real-mode entry point is called.
 
 	acpi_sci=	[HW,ACPI] ACPI System Control Interrupt trigger mode
 			Format: { level | edge | high | low }
diff --git a/Documentation/power/swsusp.txt b/Documentation/power/swsusp.txt
index aea7e92..d3e5e4e 100644
--- a/Documentation/power/swsusp.txt
+++ b/Documentation/power/swsusp.txt
@@ -386,6 +386,11 @@ before suspending; then remount them aft
 There is a work-around for this problem.  For more information, see
 Documentation/usb/persist.txt.
 
+Q: Can I suspend-to-disk using a swap partition under LVM?
+
+A: No. You can suspend successfully, but you'll not be able to
+resume. uswsusp should be able to work with LVM, see suspend.sf.net.
+
 Q: I upgraded the kernel from 2.6.15 to 2.6.16. Both kernels were
 compiled with the similar configuration files. Anyway I found that
 suspend to disk (and resume) is much slower on 2.6.16 compared to
diff --git a/drivers/acpi/hardware/hwsleep.c b/drivers/acpi/hardware/hwsleep.c
index fd1c4ba..058d0be 100644
--- a/drivers/acpi/hardware/hwsleep.c
+++ b/drivers/acpi/hardware/hwsleep.c
@@ -286,13 +286,13 @@ acpi_status asmlinkage acpi_enter_sleep_
 	}
 
 	/*
+	 * 1) Disable/Clear all GPEs
 	 * 2) Enable all wakeup GPEs
 	 */
 	status = acpi_hw_disable_all_gpes();
 	if (ACPI_FAILURE(status)) {
 		return_ACPI_STATUS(status);
 	}
-
 	acpi_gbl_system_awake_and_running = FALSE;
 
 	status = acpi_hw_enable_all_wakeup_gpes();
diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c
index 485de13..56e09cf 100644
--- a/drivers/acpi/sleep/main.c
+++ b/drivers/acpi/sleep/main.c
@@ -170,7 +170,7 @@ static int acpi_pm_enter(suspend_state_t
 	/* Reprogram control registers and execute _BFS */
 	acpi_leave_sleep_state_prep(acpi_state);
 
-	/* ACPI 3.0 specs (P62) says that it's the responsabilty
+	/* ACPI 3.0 specs (P62) says that it's the responsibilty
 	 * of the OSPM to clear the status bit [ implying that the
 	 * POWER_BUTTON event should not reach userspace ]
 	 */
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index ef9b802..b275ffb 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -74,14 +74,14 @@ config PM_TRACE_RTC
 	RTC across reboots, so that you can debug a machine that just hangs
 	during suspend (or more commonly, during resume).
 
-	To use this debugging feature you should attempt to suspend the machine,
-	then reboot it, then run
+	To use this debugging feature you should attempt to suspend the
+	machine, then reboot it, then run
 
 		dmesg -s 1000000 | grep 'hash matches'
 
 	CAUTION: this option will cause your machine's real-time clock to be
 	set to an invalid time after a resume.
 
 config PM_SLEEP_SMP
 	bool
 	depends on SMP
@@ -123,7 +129,8 @@ config HIBERNATION
 	  called "hibernation" in user interfaces.  STD checkpoints the
 	  system and powers it off; and restores that checkpoint on reboot.
 
-	  You can suspend your machine with 'echo disk > /sys/power/state'.
+	  You can suspend your machine with 'echo disk > /sys/power/state' 
+	  after placing resume=/dev/swappartition on kernel command line.
 	  Alternatively, you can use the additional userland tools available
 	  from <http://suspend.sf.net>.
 
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 6a6d5eb..d3df5af 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -223,6 +226,7 @@ void __attribute__ ((weak)) arch_suspend
  *	@state:		state to enter
  *
  *	This function should be called after devices have been suspended.
+ *	May not sleep.
  */
 static int suspend_enter(suspend_state_t state)
 {
@@ -250,6 +255,8 @@ static int suspend_enter(suspend_state_t
  *	suspend_devices_and_enter - suspend devices and enter the desired system
  *				    sleep state.
  *	@state:		  state to enter
+ *
+ *	Needs to be called from process context and may sleep.
  */
 int suspend_devices_and_enter(suspend_state_t state)
 {
@@ -341,6 +349,8 @@ static inline int valid_state(suspend_st
  *	happen when we wake up.
  *	Then, do the setup for suspend, enter the state, and cleaup (after
  *	we've woken up).
+ *
+ *	Needs to be called from process context, and may sleep.
  */
 static int enter_state(suspend_state_t state)
 {

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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