Re: [PATCH] Add hwcap2 bits for POWER9

From: Michael Ellerman <hidden>
Date: 2016-01-15 23:09:50


On 13 January 2016 03:39:17 GMT+11:00, Steven Munroe [off-list ref] wrote:

On Mon, 2016-01-11 at 15:48 -0500, Carlos O'Donell wrote:

quoted

On 01/11/2016 02:55 PM, Tulio Magno Quites Machado Filho wrote:

quoted

"Carlos O'Donell" [off-list ref] writes:

quoted

On 01/11/2016 10:16 AM, Tulio Magno Quites Machado Filho wrote:

quoted

Adhemerval Zanella [off-list ref] writes:

quoted

On 08-01-2016 13:36, Peter Bergner wrote:

quoted

On Fri, 2016-01-08 at 11:25 -0200, Tulio Magno Quites Machado

Filho wrote:

quoted

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

quoted

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

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only sync these kind of bits *after* they are included in kernel

side.

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So I would advise to either get these pieces (kernel support and

hwcap

quoted

advertise) in kernel before 2.23 release, otherwise revert the

patches.

quoted

Ack.
It has just been sent to the correspondent Linux mailing list:

https://lists.ozlabs.org/pipermail/linuxppc-dev/2016-January/137763.html

quoted

Please revert the changes from glibc until you checkin support to

linux

quoted

kernel mainline.

Leaving these bits in increases the risk that someone uses to

deploy a glibc

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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

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