linux-kernel - Re: [PATCH] parisc: Switch from GENERIC_CPU_DEVICES to GENERIC_ARCH

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Date:   Fri, 1 Apr 2022 10:44:26 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Helge Deller <deller@....de>
Cc:     James.Bottomley@...senPartnership.com,
        linux-parisc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] parisc: Switch from GENERIC_CPU_DEVICES to
 GENERIC_ARCH_TOPOLOGY

On 4/1/22 09:47, Helge Deller wrote:
> Hi Günter,
> 
> On 4/1/22 17:41, Guenter Roeck wrote:
>> On Thu, Mar 24, 2022 at 07:46:50PM +0100, Helge Deller wrote:
>>> Switch away from the own cpu topology code to common code which is used
>>> by ARM64 and RISCV. That will allow us to enable CPU hotplug later on.
>>>
>>> Signed-off-by: Helge Deller <deller@....de>
>>
>> This patch results in the following traceback when
>> booting generic-32bit_defconfig - SMP in qemu.
> 
> That's strange, because I just built this generic-32bit_defconfig myself and
> it boots up nicely in qemu for me. The only thing missing is CONFIG_CGROUPS=y so that
> systemd can start.
> 

Did you disable SMP (that is what - SMP was supposed to mean) ?
Also, note that the system does boot fine, it just spits out the warning.

> I'm not sure how I can debug/reproduce your bug report...
> 

I see the problem with generic-32bit_defconfig if I disable SMP.
I normally have some other (debug) options enabled, but I confirmed
that it is sufficient to disable SMP. The actual command line should
not matter, but here is one of mine as example (for booting from
initrd). I currently use qemu v6.2.

qemu-system-hppa -kernel vmlinux \
     -no-reboot -initrd rootfs.cpio \
     -device e1000,netdev=net0 -netdev user,id=net0 \
     -append "panic=-1 slub_debug=FZPUA rdinit=/sbin/init console=ttyS0,115200" \
     -nographic -monitor null

Guenter