[OE-core] [PATCH V2] [RFC] kernel: rework kernel and module classes to allow for building out-of-tree modules

[Richard Purdie]

On Thu, 2011-03-17 at 04:40 -0600, Gary Thomas wrote:
> On 03/16/2011 01:26 PM, Darren Hart wrote:
> > On 03/16/2011 10:54 AM, Koen Kooi wrote:
> >>
> >> Op 16 mrt 2011, om 18:04 heeft Darren Hart het volgende geschreven:
> >>
> >>> NOT FOR INCLUSION
> >>>
> >>> Before we include something like this, it needs review from folks like Koen and
> >>> Gary to confirm it works in their environment as well.
> >>>
> >>> The existing infrastructure uses an external build tree which references the
> >>> kernel source in the work dir. If run with rm work, building external modules
> >>> will fail.
> >>>
> >>> This patch places a configured source tree in sysroots. Striking a balance
> >>> between minimal size and minimal maintenance is difficult. A fully configured
> >>> tree is about 500MB after a clean. This version leans on the side of caution and
> >>> removes only the obviously unecessary parts of the source tree to conserve
> >>> space, resulting in about 170MB. The arch directories would be some additional
> >>> pruning we could do. Given examples from the devel package from distributions, I
> >>> suspect this size could be reduced to 75MB or so, but at the cost of a much more
> >>> complex recipe which is likely to require a great deal more maintenance to keep
> >>> current with kernel releases.
> >>>
> >>> Care is also taken to clean the hostprogs in scripts, and the modules are
> >>> responsible for building them as needed. Although it is unclear to me if this is
> >>> really necessary, especially considering that modules put these bits back as
> >>> soon as they compile. If we are not generating an sstate package, I suspect we
> >>> can ignore these.
> >>>
> >>> Please try this with your modules and let me know how it does. I tried to take
> >>> non linux-yocto kernel recipes into account, but I have only tested with
> >>> linux-yocto and the hello-mod recipe so far.
> >>>
> >>> V2: o Address 000 perm quilt files (don't copy .pc dir)
> >>> o Clear linux-yocto meta dir from sysroots
> >>>
> >>> Signed-off-by: Darren Hart<dvhart at linux.intel.com>
> >>
> >> This one works beautifully, so:
> >>
> >> Acked-by: Koen Kooi<koen at dominion.thruhere.net>
> >
> > Thanks Koen.
> >
> > Gary, can you give this version a spin?
> >
> > If it works, I'm going to suggest we take this as is and carefully prune away bits we don't need over time so we can get adequate testing across multiple archs, platforms, and
> > modules. Same for the hostprogs cleaning bits.
> >
> 
> It also worked for me.  Thanks - you can add
> 
> Acked-by: Gary Thomas <gary at mlbassoc.com>

Thanks all, I'm going to merge this to master.

Cheers,

Richard