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Re: [PATCH] Add hwcap2 bits for POWER9
- From: Michael Ellerman <michael at ellerman dot id dot au>
- To: munroesj at linux dot vnet dot ibm dot com,Carlos O'Donell <carlos at redhat dot com>
- Cc: linuxppc-dev at lists dot ozlabs dot org,libc-alpha at sourceware dot org,Adhemerval Zanella <adhemerval dot zanella at linaro dot org>,Tulio Magno Quites Machado Filho <tuliom at linux dot vnet dot ibm dot com>
- Date: Sat, 16 Jan 2016 10:09:46 +1100
- Subject: Re: [PATCH] Add hwcap2 bits for POWER9
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- References: <568C272D dot 6000705 at linux dot vnet dot ibm dot com> <87egdsi4om dot fsf at totoro dot br dot ibm dot com> <1452267366 dot 5201 dot 12 dot camel at vnet dot ibm dot com> <568FE3D0 dot 7080008 at linaro dot org> <87wprgdu3u dot fsf at totoro dot br dot ibm dot com> <5693C861 dot 9030308 at redhat dot com> <87bn8revra dot fsf at totoro dot br dot ibm dot com> <56941532 dot 9030800 at redhat dot com> <1452616757 dot 29488 dot 10 dot camel at oc7878010663>
On 13 January 2016 03:39:17 GMT+11:00, Steven Munroe <munroesj@linux.vnet.ibm.com> wrote:
>On Mon, 2016-01-11 at 15:48 -0500, Carlos O'Donell wrote:
>> On 01/11/2016 02:55 PM, Tulio Magno Quites Machado Filho wrote:
>> > "Carlos O'Donell" <carlos@redhat.com> writes:
>> >
>> >> On 01/11/2016 10:16 AM, Tulio Magno Quites Machado Filho wrote:
>> >>> Adhemerval Zanella <adhemerval.zanella@linaro.org> writes:
>> >>>
>> >>>> On 08-01-2016 13:36, Peter Bergner wrote:
>> >>>>> On Fri, 2016-01-08 at 11:25 -0200, Tulio Magno Quites Machado
>Filho wrote:
>> >>>>>> Peter, this solves the issue you reported previously [1].
>> >>>>>>
>> >>>>>> [1] https://sourceware.org/ml/libc-alpha/2015-12/msg00522.html
>> >>>>>
>> >>>>> Agreed, thanks. I'll also add the POWER9 support to the GCC
>side
>> >>>>> of the patch now that the glibc code is upstream.
>> >>>>
>> >>>> I do not see these bits being added in kernel side yet and GLIBC
>usual
>> >>>> only sync these kind of bits *after* they are included in kernel
>side.
>> >>>> So I would advise to either get these pieces (kernel support and
>hwcap
>> >>>> advertise) in kernel before 2.23 release, otherwise revert the
>patches.
>> >>>
>> >>> Ack.
>> >>> It has just been sent to the correspondent Linux mailing list:
>> >>>
>https://lists.ozlabs.org/pipermail/linuxppc-dev/2016-January/137763.html
>> >>
>> >> Please revert the changes from glibc until you checkin support to
>linux
>> >> kernel mainline.
>> >>
>> >> Leaving these bits in increases the risk that someone uses to
>deploy a glibc
>> >> that then may have the wrong value.
>> >
>> > Could you clarify this statement, please?
>> > I fail to see how they could have the wrong value.
>>
>> Until it is checked into the mainline kernel it is not canonical.
>>
>> That's the rule. There are no other discussions to be had.
>>
>Well is was posted to to powerpc next:
>https://git.kernel.org/powerpc/c/e708c24cd01ce80b1609d8bacc
And it is now in Linus' tree:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e708c24cd01ce80b1609d8baccee40ccc3608a01
cheers