PM / Hibernate: Compress hibernation image with LZO

Compress hibernation image with LZO in order to save on I/O and
therefore time to hibernate/thaw.

[rjw: Added hibernate=nocompress command line option instead of just
 nocompress which would be confusing, fixed a couple of compiler
 warnings, fixed kerneldoc comments, minor cleanups.]

Signed-off-by: Bojan Smojver <bojan@rexursive.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

1 files changed, 13 insertions, 0 deletions

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 8dc31e02ae12..6c9c9dc48c75 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -29,6 +29,7 @@
 #include "power.h"
 
 
+static int nocompress = 0;
 static int noresume = 0;
 static char resume_file[256] = CONFIG_PM_STD_PARTITION;
 dev_t swsusp_resume_device;
@@ -638,6 +639,8 @@ int hibernate(void)
 
                 if (hibernation_mode == HIBERNATION_PLATFORM)
                         flags |= SF_PLATFORM_MODE;
+                if (nocompress)
+                        flags |= SF_NOCOMPRESS_MODE;
                 pr_debug("PM: writing image.\n");
                 error = swsusp_write(flags);
                 swsusp_free();
@@ -1004,6 +1007,15 @@ static int __init resume_offset_setup(char *str)
         return 1;
 }
 
+static int __init hibernate_setup(char *str)
+{
+        if (!strncmp(str, "noresume", 8))
+                noresume = 1;
+        else if (!strncmp(str, "nocompress", 10))
+                nocompress = 1;
+        return 1;
+}
+
 static int __init noresume_setup(char *str)
 {
         noresume = 1;
@@ -1013,3 +1025,4 @@ static int __init noresume_setup(char *str)
 __setup("noresume", noresume_setup);
 __setup("resume_offset=", resume_offset_setup);
 __setup("resume=", resume_setup);
+__setup("hibernate=", hibernate_setup);