Re: [PATCH] PM: sleep: Optimize the pm_debug_messages_should_print() function

[xiongxin <xiongxin@kylinos.cn>]

在 2024/4/24 00:52, Mario Limonciello 写道:
> On 4/23/2024 03:17, xiongxin wrote:
>> commit cdb8c100d8a4 ("include/linux/suspend.h: Only show pm_pr_dbg
>> messages at suspend/resume"), pm_debug_messages_should_print() is
>> implemented to determine the output of pm_pr_dbg(), using
>> pm_suspend_target_state to identify the suspend process. However, this
>> limits the output range of pm_pr_dbg().
>>
>> In the suspend process, pm_pr_dbg() is called before setting
>> pm_suspend_target_state. As a result, this part of the log cannot be
>> output.
>>
>> pm_pr_dbg() also outputs debug logs for hibernate, but
>> pm_suspend_target_state is not set, resulting in hibernate debug logs
>> can only be output through dynamic debug, which is very inconvenient.
>>
>> Currently, remove pm_suspend_target_state from
>> pm_debug_messages_should_print() to ensure that sleep and hibernate main
>> logic can output debug normally.
>>
>> Fixes: cdb8c100d8a4 ("include/linux/suspend.h: Only show pm_pr_dbg 
>> messages at suspend/resume").
>> Signed-off-by: xiongxin <xiongxin@kylinos.cn>
>> ---
>> v2:
>>     * Resolve the compilation error and re-submit with the fix
>>       patch.
>> v1:
>>     * Revert the commit cdb8c100d8a4 ("include/linux/suspend.h: Only
>>       show pm_pr_dbg messages at suspend/resume").
>> ---
>>
>> diff --git a/kernel/power/main.c b/kernel/power/main.c
>> index a9e0693aaf69..24693599c0bc 100644
>> --- a/kernel/power/main.c
>> +++ b/kernel/power/main.c
>> @@ -613,7 +613,7 @@ bool pm_debug_messages_on __read_mostly;
>>     bool pm_debug_messages_should_print(void)
>>   {
>> -    return pm_debug_messages_on && pm_suspend_target_state != 
>> PM_SUSPEND_ON;
>> +    return pm_debug_messages_on;
>>   }
>>   EXPORT_SYMBOL_GPL(pm_debug_messages_should_print);
>
> Did you miss the proposal for fixing this for hibernate by adding the 
> extra variable to monitor?

Can I change pm_pr_dbg() in amd_pmc_idlemask_read() to pr_debug() based on

pm_debug_messages_on condition?

I suggest not adding a new variable to this.