| Message ID | 20200327111141.14324-1-yu.c.chen@intel.com |
|---|---|
| State | New |
| Headers | show |
| Series | PM / sleep: Add pm_debug_messages boot command control | expand |
diff --git a/kernel/power/main.c b/kernel/power/main.c index 69b7a8aeca3b..1da3d7c15e03 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -535,6 +535,13 @@ static ssize_t pm_debug_messages_store(struct kobject *kobj, power_attr(pm_debug_messages); +static int __init pm_debug_message_setup(char *str) +{ + pm_debug_messages_on = true; + return 1; +} +__setup("pm_debug_message", pm_debug_message_setup); + /** * __pm_pr_dbg - Print a suspend debug message to the kernel log. * @defer: Whether or not to use printk_deferred() to print the message.
Debug messages from the system suspend/hibernation infrastructure is disabled by default, and can only be enabled after the system has boot up via /sys/power/pm_debug_messages. This makes the hibernation resume hard to track as it involves system boot up across hibernation. There's no chance for software_resume() to track the resume process, eg. Turning on the pm_debug_messages during boot up by appending 'pm_debug_message'. Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Len Brown <lenb@kernel.org> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Chen Yu <yu.c.chen@intel.com> --- kernel/power/main.c | 7 +++++++ 1 file changed, 7 insertions(+)