Re: 2.6.20 instability

[Paul M. <pau...@re...>]

On Fri, Feb 02, 2007 at 08:31:26AM +0100, Manuel Lauss wrote:
> On Tue, Jan 30, 2007 at 09:36:38AM +0100, Manuel Lauss wrote:
> > > My hesitation with this so far has been that some folks in the office
> > > have hit troubles booting from CF with that applied, which I didn't see
> > > on SATA when I was debugging it initially. I would prefer not to break
> > > one set of boards in exchange for another, though it looks like it's
> 
> I see now what you mean: kernel occasionally oopses when I
> insert a PCMCIA card, like this one:
> 
How is the situation if you have both

    sh: Don't set reserved _PAGE_WT bit on SH-3.

and

    sh: Lazy dcache writeback optimizations.

reverted? (git show <hash> | patch -p1 -R in that order works fine)

We're still not quite all the way there with the kmap_coherent() stuff
(and the move to copy_user_highpage()), so that's still going to take a
bit of work. While I think most of the page colouring problems are now
taken care of, it seems in the PG_dcache_dirty route we're _still_
missing some flushing that seems to break in certain paths regardless of
the kmap state.

If you have issues with those two reverted, it would be interesting to
see the logs. My SH7760 test board is much more stable with PG_mapped, at
the cost of some performance.