[PATCH v5 17/17] powerpc/32s: Enable CONFIG_VMAP_STACK

[Christophe Leroy]

Le 06/02/2020 à 21:31, Guenter Roeck a écrit :
> On Sat, Dec 21, 2019 at 08:32:38AM +0000, Christophe Leroy wrote:
>> A few changes to retrieve DAR and DSISR from struct regs
>> instead of retrieving them directly, as they may have
>> changed due to a TLB miss.
>>
>> Also modifies hash_page() and friends to work with virtual
>> data addresses instead of physical ones. Same on load_up_fpu()
>> and load_up_altivec().
>>
>> Signed-off-by: Christophe Leroy <christophe.leroy at c-s.fr>
> 
> This patch results in qemu boot failures (mac99 with pmac32_defconfig).
> Images fail silently; there is no console output. Reverting the patch
> fixes the problem. Bisect log is attached below.
> 
> Assuming this was tested on real hardware, am I correct to assume that qemu
> for ppc32 (more specifically, qemu's mac99 and g3beige machines) no longer
> works with the upstream kernel ?

Before submitting the series, I successfully tested:
- Real HW with powerpc 8xx
- Real HW with powerpc 832x
- Qemu's mac99

I'll re-check the upstream kernel.

In the mean time, you can still unselect CONFIG_VMAP_STACK in your config.

Christophe