linux-kernel - [PATCH v2 RFT 2/2] PM / Hibernate: add section for resume options

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Date:	Tue, 27 Aug 2013 18:13:57 -0700
From:	Sebastian Capella <sebastian.capella@...aro.org>
To:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-doc@...ts.infradead.org, linux-pm@...r.kernel.org,
	linaro-dev@...ts.linaro.org
Cc:	Sebastian Capella <sebastian.capella@...aro.org>,
	Rob Landley <rob@...dley.net>, Len Brown <len.brown@...el.com>,
	Pavel Machek <pavel@....cz>, "Rafael J. Wysocki" <rjw@...k.pl>
Subject: [PATCH v2 RFT 2/2] PM / Hibernate: add section for resume options

Expand the existing documentation to explicitly list the options for
resuming a hibernation image, including the manual resume option which
can be used from the initrd or initramfs and the kernel init resume.

Signed-off-by: Sebastian Capella <sebastian.capella@...aro.org>
Cc: Rob Landley <rob@...dley.net>
Cc: Len Brown <len.brown@...el.com>
Cc: Pavel Machek <pavel@....cz>
Cc: "Rafael J. Wysocki" <rjw@...k.pl>
---
 Documentation/power/swsusp.txt |   15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/Documentation/power/swsusp.txt b/Documentation/power/swsusp.txt
index 0b4b63e..079160e 100644
--- a/Documentation/power/swsusp.txt
+++ b/Documentation/power/swsusp.txt
@@ -50,6 +50,19 @@ echo N > /sys/power/image_size
 
 before suspend (it is limited to 500 MB by default).
 
+. The resume process checks for the presence of the resume device,
+if found, it then checks the contents for the hibernation image signature.
+If both are found, it resumes the hibernation image.
+
+. The resume process may be triggered in two ways:
+  1) During lateinit:  If resume=/dev/your_swap_partition is specified on
+     the kernel command line, lateinit runs the resume process.  If the
+     resume device has not been probed yet, the resume process fails and
+     bootup continues.
+  2) Manually from an initrd or initramfs:  May be run from
+     the init script by using the /sys/power/resume file.  It is vital
+     that this be done prior to remounting any filesystems (even as
+     read-only) otherwise data may be corrupted.
 
 Article about goals and implementation of Software Suspend for Linux
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -326,7 +339,7 @@ Q: How can distributions ship a swsusp-supporting kernel with modular
 disk drivers (especially SATA)?
 
 A: Well, it can be done, load the drivers, then do echo into
-/sys/power/disk/resume file from initrd. Be sure not to mount
+/sys/power/resume file from initrd. Be sure not to mount
 anything, not even read-only mount, or you are going to lose your
 data.
 
-- 
1.7.9.5

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