On 21/02/2023 11:42, Oleksandr Natalenko wrote:
On 21.02.2023 11:47, Usama Arif wrote:
On 21/02/2023 10:27, David Woodhouse wrote:
On 21 February 2023 09:49:51 GMT, Oleksandr Natalenko
<oleksandr@xxxxxxxxxxxxxx> wrote:
On 21.02.2023 10:06, David Woodhouse wrote:
Why does arch/x86/kernel/acpi/sleep.c::x86_acpi_suspend_lowlevel() set
initial_gs = per_cpu_offset(smp_processor_id()) ?
Would it not be CPU#0 that comes back up, and should it not get
per_cpu_offset(0) ?
Wanna me try `initial_gs = per_cpu_offset(0);` too?
I think it might be smp_processor_id() and not 0 incase CPU0 was
offline at the point the system was suspended?
Is it even possible for CPU 0 to be offline, at least on x86?
It is possible on x86 (using BOOTPARAM_HOTPLUG_CPU0), but I just read
the Kconfig option and it says:
"resume from hibernate or suspend always starts from CPU0.
So hibernate and suspend are prevented if CPU0 is offline."
so I guess switching to 0 should be ok.
