[PATCH 0/2] powerpc: Remove support for ppc405/440 Xilinx platforms

[Michael Ellerman]

Christophe Leroy <christophe.leroy at c-s.fr> writes:
> Le 27/03/2020 à 15:14, Andy Shevchenko a écrit :
>> On Fri, Mar 27, 2020 at 02:22:55PM +0100, Arnd Bergmann wrote:
>>> On Fri, Mar 27, 2020 at 2:15 PM Andy Shevchenko
>>> <andriy.shevchenko at linux.intel.com> wrote:
>>>> On Fri, Mar 27, 2020 at 03:10:26PM +0200, Andy Shevchenko wrote:
>>>>> On Fri, Mar 27, 2020 at 01:54:33PM +0100, Arnd Bergmann wrote:
>>>>>> On Fri, Mar 27, 2020 at 1:12 PM Michal Simek <michal.simek at xilinx.com> wrote:
>> ...
>> 
>>>>>> It does raise a follow-up question about ppc40x though: is it time to
>>>>>> retire all of it?
>>>>>
>>>>> Who knows?
>>>>>
>>>>> I have in possession nice WD My Book Live, based on this architecture, and I
>>>>> won't it gone from modern kernel support. OTOH I understand that amount of real
>>>>> users not too big.
>>>>
>>>> +Cc: Christian Lamparter, whom I owe for that WD box.
>>>
>>> According to https://openwrt.org/toh/wd/mybooklive, that one is based on
>>> APM82181/ppc464, so it is about several generations newer than what I
>>> asked about (ppc40x).
>>>
>>>>> Ah, and I have Amiga board, but that one is being used only for testing, so,
>>>>> I don't care much.
>>>
>>> I think there are a couple of ppc440 based Amiga boards, but again, not 405
>>> to my knowledge.
>> 
>> Ah, you are right. No objections from ppc40x removal!
>
> Removing 40x would help cleaning things a bit. For instance 40x is the 
> last platform still having PTE_ATOMIC_UPDATES. So if we can remove 40x 
> we can get rid of PTE_ATOMIC_UPDATES completely.
>
> If no one objects, I can prepare a series to drop support for 40x 
> completely.
>
> Michael, any thought ?

I have no attachment to 40x, and I'd certainly be happy to have less
code in the tree, we struggle to keep even the modern platforms well
maintained.

At the same time I don't want to render anyone's hardware obsolete
unnecessarily. But if there's really no one using 40x then we should
remove it, it could well be broken already.

So I guess post a series to do the removal and we'll see if anyone
speaks up.

cheers