Date: Fri, 15 Feb 2008 16:12:08 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Randy Dunlap <randy.dunlap@oracle.com>
Cc: rmk+lkml@arm.linux.org.uk, greg@kroah.com, torvalds@linux-foundation.org,
       jeff@garzik.org, davem@davemloft.net, arjan@infradead.org,
       sfr@canb.auug.org.au, linux-kernel@vger.kernel.org,
       linux-next@vger.kernel.org, linux-arch@vger.kernel.org
Subject: Re: Announce: Linux-next (Or Andrew's dream :-))
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On Fri, 15 Feb 2008 15:47:24 -0800
Randy Dunlap <randy.dunlap@oracle.com> wrote:

> On Fri, 15 Feb 2008 15:37:32 -0800 Andrew Morton wrote:
> 
> > On Fri, 15 Feb 2008 23:23:08 +0000
> > Russell King <rmk+lkml@arm.linux.org.uk> wrote:
> > 
> > > On Tue, Feb 12, 2008 at 12:48:13PM -0800, Greg KH wrote:
> > > > I have tried, and successfully done this many times in the past.  The
> > > > kobject change was one example: add a new function, migrate all users of
> > > > a direct pointer over to that function, after that work is all done and
> > > > in, change the structure and do the needed work afterward.  All is
> > > > bisectable completly, with no big "flag day" needed.
> > > 
> > > Incorrect - because this all happened far too quickly.  This is one of
> > > the reasons that I ended up having to redo various parts of the ARM tree
> > > because stuff broke - set_kset_name() completely vanished introducing
> > > compile errors, and iirc some merge issues as well.
> > > 
> > > I had patches introducing new system objects which use that, and
> > > modifications extremely close to other uses in the PXA code.
> > > 
> > > The end result (through rebuilding the affected parts of my git tree, and
> > > asking people for replacement patches) was something that is bisectable -
> > > but had I tried to merge stuff as is, it would've been an utter mess, and
> > > _was_ unbuildable.
> > > 
> > 
> > I wonder why I didn't see any of this - I build arm allmodconfig at least
> > once a week, usually more frequently.
> > 
> > So either the offending patches weren't in my pile or arm allmodconfig is
> > worse than I thought :(
> > 
> > It really is in arch maintainers' best interest to keep their allmodconfig
> > in good shape, for this reason.  arm's _isn't_ in good shape: the compile
> > fails for several long-standing reasons (eg: no hope of building DRM) and I
> > don't think the coverage is very broad either.
> 
> I think that Russell has said that allmodconfig isn't very realistic
> for ARM, with its 70+ config files.

You'd need to pick one board support and enable everything else you
possibly can.

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