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PM: sleep: Add pm_debug_messages kernel command line option

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Debug messages from the system suspend/hibernation infrastructure
are 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, for example.

Add a kernel command line option to set pm_debug_messages during
boot up.

Signed-off-by: Chen Yu <yu.c.chen@intel.com>
[ rjw: Subject & changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Chen Yu 2020-04-02 15:56:52 +08:00 • committed by Rafael J. Wysocki
parent b5252a6cbb
commit db96a75946
2 changed files with 10 additions and 0 deletions
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7
kernel/power/main.c
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@ -535,6 +535,13 @@ static ssize_t pm_debug_messages_store(struct kobject *kobj,
power_attr(pm_debug_messages);
static int __init pm_debug_messages_setup(char *str)
{
pm_debug_messages_on = true;
return 1;
}
__setup("pm_debug_messages", pm_debug_messages_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.