Re: [PATCH] resource, kunit: add dependency on SPARSEMEM

[Guenter Roeck]

On 9/23/24 06:47, Geert Uytterhoeven wrote:
> Hi Günter,
>
> On Mon, Sep 23, 2024 at 3:39 PM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> > Interesting that you get that to boot. The q800 machine crashes for me
> > when trying to boot it in qemu with the latest upstream kernel, in function
> > __pte_offset_map_lock(). It bisects to commit 394290cba966 ("mm: turn
> > USE_SPLIT_PTE_PTLOCKS / USE_SPLIT_PTE_PTLOCKS into Kconfig options").
> > Reverting that patch fixes the crash for me. I guess you are not seeing that ?
>
> I never used qemu -M q800.
> I have just verified that -M virt boots fine?

m68k doesn't define a NR_CPUs configuration option. The new "config
SPLIT_PTE_PTLOCKS" depends on "NR_CPUS >= 4" but for some reason that
evaluates to true if there is no NR_CPUS configuration option.

It is interesting that this does not affect the 'virt' machine.

Guenter