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Old 04-07-2021, 12:31 PM   #1
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'ERROR: modpost: "wakeup_cpu0" [drivers/acpi/processor.ko] undefined! ' building kernel 5.11.12

I applied the incremental patch patch-5.11.11-12.xz, make errored out:
ERROR: modpost: "wakeup_cpu0" [drivers/acpi/processor.ko] undefined!
ERROR: modpost: "start_cpu0" [drivers/acpi/processor.ko] undefined!
To test patched-ness I ran:
xz -dc patch-5.11.12.xz | patch -p1 -R --dry-run
when ran without error. The .configs are identical.

Later that same day: it happens even after a make clean

3 days later:

I had hoped that the patch to 5.11.13 would fix this error, but it didn't. I downloaded the whole source for 5.11.13, get the same error - am I the only one? I can build 5.11.11.

Even later:

#if defined(CONFIG_X86) && defined(CONFIG_HOTPLUG_CPU)
                /* If NMI wants to wake up CPU0, start CPU0. */
                if (wakeup_cpu0())
out of drivers/acpi/processor_idle.c eliminates the error

Last edited by RandomTroll; 04-10-2021 at 10:56 PM. Reason: additional information.


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