ppc64 kernel config changes heads up

[Peter Robinson]

Hi All,

If you don't care about powerpc you can stop reading :-)

If you do.... I went to do what I thought was a basic fix up to the
kernel builds on POWER to get rid of the last bits of the ppc32
legacy, on my list for some time, and it has become more of a slightly
epic slash and burn!

The resulting output kernel configs are for all intents and purpose
unchanged but the git diff is some what epic.

The top level of the changes are:

Core changes that apply too all kernels (ppc64/ppc64p7/ppc64le) reside
in config-powerpc64-generic

config-powerpc64 -> legacy platforms that are older than POWER7 and
their dependencies (here lies the ghosts of PowerPC G5 and friends).

config-powerpc64le and config-powerpc64p7 contain anything specific to
POWER7 and newer that might affect older platforms, or LE/BE specific
to p7 and later

I've removed anything that pertains to PPC32 and Cell processors (the
later were all disabled now anyway) but if the kernel docs were wrong
and they do by chance work on some other 64 bit platform that still
works do let me know.

So the only thing of real note is the ppc64p7 and ppc64le configs no
longer have any old IDE configs enabled or any of the legacy Apple
bits pulled in, I don't believe that should cause any pain what so
ever, I only bring this up because it's the only thing of note on
diffs of before/after resulting config diffs.

So ultimately please test kernel builds going forward. There's a
scratch build here [1] until we get an official one to test. There's
no perf packages, that appears broeken... even on vanilla pre commit
:)

For those that are morbidly interested in the diff (and don't have the
Fedora kernel package check out) you can see that here [2].

Ultimately the large git commit looks quite scary but the actual
change to the 3 configs are minimal and I believe this should make
things cleaner moving forward :-)

I look forward to the testing feedback including any further suggested
cleanups to the new configs, oh and please test :-)

Peter

[1] http://ppc.koji.fedoraproject.org/koji/taskinfo?taskID=2582705
[2]
http://pkgs.fedoraproject.org/cgit/kernel.git/commit/?id=c9229e16082bdc9b...

[Al Dunsmuir]

On Friday, June 26, 2015, 5:40:02 PM, Peter Robinson wrote:
>  If you don't care about powerpc you can stop reading :-) 
>  If you do.... I went to do what I thought was a basic fix up to the
>  kernel builds on POWER to get rid of the last bits of the ppc32
>  legacy, on my list for some time, and it has become more of a slightly
>  epic slash and burn! 
>  The resulting output kernel configs are for all intents and purpose
>  unchanged but the git diff is some what epic. 
>  The top level of the changes are: 
>  Core changes that apply too all kernels (ppc64/ppc64p7/ppc64le)
> reside
>  in config-powerpc64-generic 
config-powerpc64 ->> legacy platforms that are older than POWER7 and
>  their dependencies (here lies the ghosts of PowerPC G5 and friends).
>  config-powerpc64le and config-powerpc64p7 contain anything specific
> to
>  POWER7 and newer that might affect older platforms, or LE/BE specific
>  to p7 and later 
I saw a recent post by Peter Saisanas on the debian powerPC list
that warns that the nouveau video driver is not compatible with
64KB pages.

https://lists.debian.org/debian-powerpc/2015/06/msg00054.html

If you plan to set up the config-powerpc64le and config-powerpc64p7
with 64K pages, please leave config-powerpc64 as 4KB.

One has about an equal chance of encountering ATI and Vidia graphics
on Mac PPC64 machines.  I know nothing about the recent P8 boxes.

[Peter Robinson]

On Mon, Jun 29, 2015 at 4:38 PM, Al Dunsmuir <al.dunsmuir(a)sympatico.ca&gt; wrote:
>  On Friday, June 26, 2015, 5:40:02 PM, Peter Robinson wrote:
> > If you don't care about powerpc you can stop reading :-)
>
> > If you do.... I went to do what I thought was a basic fix up to the
> > kernel builds on POWER to get rid of the last bits of the ppc32
> > legacy, on my list for some time, and it has become more of a slightly
> > epic slash and burn!
>
> > The resulting output kernel configs are for all intents and purpose
> > unchanged but the git diff is some what epic.
>
> > The top level of the changes are:
>
> > Core changes that apply too all kernels (ppc64/ppc64p7/ppc64le) reside
> > in config-powerpc64-generic
>
>  config-powerpc64 ->> legacy platforms that are older than POWER7 and
> > their dependencies (here lies the ghosts of PowerPC G5 and friends).
>
> > config-powerpc64le and config-powerpc64p7 contain anything specific to
> > POWER7 and newer that might affect older platforms, or LE/BE specific
> > to p7 and later
>
>  I saw a recent post by Peter Saisanas on the debian powerPC list
>  that warns that the nouveau video driver is not compatible with
>  64KB pages. 
There was no change of the config in regards to page sizes.

Peter

>  https://lists.debian.org/debian-powerpc/2015/06/msg00054.html
>
>  If you plan to set up the config-powerpc64le and config-powerpc64p7
>  with 64K pages, please leave config-powerpc64 as 4KB.
>
>  One has about an equal chance of encountering ATI and Vidia graphics
>  on Mac PPC64 machines.  I know nothing about the recent P8 boxes.
>

[Dan Horák]

On Fri, 26 Jun 2015 22:40:02 +0100
Peter Robinson <pbrobinson(a)gmail.com&gt; wrote:

>  Hi All,
>  
>  If you don't care about powerpc you can stop reading :-)
>  
>  If you do.... I went to do what I thought was a basic fix up to the
>  kernel builds on POWER to get rid of the last bits of the ppc32
>  legacy, on my list for some time, and it has become more of a slightly
>  epic slash and burn! 
generally ACK as it goes into the right direction :-)

one note - if I recall correctly from the F-22 testing on G5, then the
power mgmt depends on I2C, but because it is built as module, all the
power mgmt modules are built as modules and not as built-in as
requested in our kernel config. My idea was to make I2C built-in for
all arches (and move it to generic config), but I haven't get to
actually do the cleanup.

>  The resulting output kernel configs are for all intents and purpose
>  unchanged but the git diff is some what epic.
>  
>  The top level of the changes are:
>  
>  Core changes that apply too all kernels (ppc64/ppc64p7/ppc64le) reside
>  in config-powerpc64-generic
>  
>  config-powerpc64 -> legacy platforms that are older than POWER7 and
>  their dependencies (here lies the ghosts of PowerPC G5 and friends).
>  
>  config-powerpc64le and config-powerpc64p7 contain anything specific to
>  POWER7 and newer that might affect older platforms, or LE/BE specific
>  to p7 and later
>  
>  I've removed anything that pertains to PPC32 and Cell processors (the
>  later were all disabled now anyway) but if the kernel docs were wrong
>  and they do by chance work on some other 64 bit platform that still
>  works do let me know.
>  
>  So the only thing of real note is the ppc64p7 and ppc64le configs no
>  longer have any old IDE configs enabled or any of the legacy Apple
>  bits pulled in, I don't believe that should cause any pain what so
>  ever, I only bring this up because it's the only thing of note on
>  diffs of before/after resulting config diffs.
>  
>  So ultimately please test kernel builds going forward. There's a
>  scratch build here [1] until we get an official one to test. There's
>  no perf packages, that appears broeken... even on vanilla pre commit
>  :)
>  
>  For those that are morbidly interested in the diff (and don't have the
>  Fedora kernel package check out) you can see that here [2].
>  
>  Ultimately the large git commit looks quite scary but the actual
>  change to the 3 configs are minimal and I believe this should make
>  things cleaner moving forward :-)
>  
>  I look forward to the testing feedback including any further suggested
>  cleanups to the new configs, oh and please test :-) 

		Dan