Le 27/08/2020 à 16:37, Giuseppe Sacco a écrit :
Il giorno gio, 27/08/2020 alle 12.39 +0200, Christophe Leroy ha

Le 27/08/2020 à 10:28, Giuseppe Sacco a écrit :
Sorry, I made a mistake. The real problem is down, on the same
function, when it calls low_sleep_handler(). This is where the problem
probably is.

Great, you spotted the problem.

I see what it is, it is in low_sleep_handler() in

All critical registers are saved on the stack. At restore, they are
restore BEFORE re-enabling MMU (because they are needed for that). But
when we have VMAP_STACK, the stack can hardly be accessed without the
MMU enabled. tophys() doesn't work for virtual stack addresses.

Therefore, the low_sleep_handler() has to be reworked for using an area
in the linear mem instead of the stack.

I am sorry, but I don't know how to fix it. Should I open a bug for
tracking this problem?

Yes please, at https://github.com/linuxppc/issues/issues

In the meantime, I have sent a patch to disable CONFIG_VMAP_STACK when CONFIG_ADB_PMU is selected until this is fixed.

Have you tried without CONFIG_ADB_PMU ? Or does it make no sense ?


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