Re: [PATCH] parisc: Switch from GENERIC_CPU_DEVICES to GENERIC_ARCH_TOPOLOGY

[Guenter Roeck]

On 4/1/22 13:35, Helge Deller wrote:
> Hi Günter,
>
> * Guenter Roeck <linux@xxxxxxxxxxxx>:
> > 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@xxxxxx>
> > > >
> > > > 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.
>
> The patch below fixes the warning for me.
> Could you try?

I did, and it fixes the problem. I just sent a Tested-by: in response to
your patch.

Guenter

> Helge
>
>
> From: Helge Deller <deller@xxxxxx>
> Subject: [PATCH] parisc: Re-enable GENERIC_CPU_DEVICES for !SMP
>
> In commit 62773112acc5 ("parisc: Switch from GENERIC_CPU_DEVICES to
> GENERIC_ARCH_TOPOLOGY") GENERIC_CPU_DEVICES was unconditionally turned
> off, but this triggers a warning in topology_add_dev(). Turning it back
> on for the !SMP case avoids this warning.
>
> Reported-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> Fixes: 62773112acc5 ("parisc: Switch from GENERIC_CPU_DEVICES to GENERIC_ARCH_TOPOLOGY")
> Signed-off-by: Helge Deller <deller@xxxxxx>
>
> diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
> index 52e550b45692..bd22578859d0 100644
> --- a/arch/parisc/Kconfig
> +++ b/arch/parisc/Kconfig
> @@ -38,6 +38,7 @@ config PARISC
>   	select ARCH_HAVE_NMI_SAFE_CMPXCHG
>   	select GENERIC_SMP_IDLE_THREAD
>   	select GENERIC_ARCH_TOPOLOGY if SMP
> +	select GENERIC_CPU_DEVICES if !SMP
>   	select GENERIC_LIB_DEVMEM_IS_ALLOWED
>   	select SYSCTL_ARCH_UNALIGN_ALLOW
>   	select SYSCTL_EXCEPTION_TRACE