[PATCH] powerpc/powernv: Turn on SCSI_AACRAID in powernv_defconfig

[Michael Ellerman]

"Guilherme G. Piccoli" <gpiccoli at linux.vnet.ibm.com> writes:

> On 08/29/2017 08:22 AM, Michael Ellerman wrote:
>> "Guilherme G. Piccoli" <gpiccoli at linux.vnet.ibm.com> writes:
>> 
>>> On 08/28/2017 02:56 AM, Michael Ellerman wrote:
>>>> Some Power9 boxes will have this adapter installed, so add it to the
>>>> defconfig so we can boot on those machines without an initrd.
>>>
>>> Michael, not sure if this affects Petitboot (I know it has its own
>>> default config files), but in the past we had some issues with this
>>> driver and it's nice to have the possibility to blacklist it.
>> 
>> Why we were black listing it?
>
> Basically for the same reason you want it built-in - debug purposes heheh
>
> In fact, this driver takes some time in its initialization process, so
> if my rootfs is not under it, to speedup my boot-time I could blacklist
> it; also, to debug the aacraid driver we could blacklist it in Petitboot
> and debug on distro (easier to build kernels there), since the issue
> could be in first probe only (or be affected by kexec-out from Petitboot).
>
> Anyway, since make it a module will harm your workflow, I agree built-in
> is the best option!

OK. So maybe when the petitboot kernel moves up to 4.14 they may want to
flip it back to being a module.

I think the majority of machines that have one of these adapters will be
using it for their root disk, so I think the slow initialisation is just
something we have to suffer.

cheers