On 8/26/20 1:26 AM, Pavel Machek wrote:
Hi!
Hi Pavel,
We have a user space tool (rtas_errd) on LPAR to monitor for EPOW_SHUTDOWN_ON_UPS. Once it gets an event it initiates shutdown after predefined time. It also starts monitoring for any new EPOW
Yeah, so there's userspace tool, and currently systems _with_ that tool work poorly with UPS.
So you have fixed that, and now, systems _without_ that tool will work poorly.
User space tool exists for long long time (more than decade) and its default tool on pseries system. Also user space tool behavior is not changed for long time.
The original design was to forward UPS event to userspace and let user space wait for predefined time and then initiate shutdown.
Previous fix accidentally initiated shutdown as soon as system switch to UPS power.
That's not a fix for serious bug, that's behaviour change. You are fixing one set of systems and breaking another.
Without fix, as soon as system switches to UPS power supply, kernel will start shutdown process. which is not correct. Its actually impacting customers running Linux on pseries LPAR mode. Hence I have requested this fix for stable tree.
Hope this clarifies your concern.
-Vasant
I don't believe it is suitable for stable.
Pavel@@ -118,7 +118,6 @@ static void handle_system_shutdown(char case EPOW_SHUTDOWN_ON_UPS: pr_emerg("Loss of system power detected. System is running on" " UPS/battery. Check RTAS error log for details\n");
orderly_poweroff(true);case EPOW_SHUTDOWN_LOSS_OF_CRITICAL_FUNCTIONS: