Le 27/08/2020 à 16:37, Giuseppe Sacco a écrit :
Il giorno gio, 27/08/2020 alle 12.39 +0200, Christophe Leroy ha
scritto:
Hi,
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
arch/powerpc/platforms/powermac/sleep.S
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 ?
Christophe
