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SubjectRe: [PATCH] PM / sleep: Add pm_debug_messages boot command control
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On 3/27/20 4:11 AM, Chen Yu wrote:
> 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'.

Please add that command line option to
Documentation/admin-guide/kernel-parameters.txt.
Thanks.

> 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(+)
>
> 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.
>


--
~Randy
Reported-by: Randy Dunlap <rdunlap@infradead.org>

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