Rex Feany [off-list ref] wrote on 30/09/2009 11:00:02:

Thus spake Joakim Tjernlund (joakim.tjernlund@transmode.se):

quoted

quoted

Ok, I have made some minor tweaks and added debug code in
do_page_fault(). Would be great if you could try on both
.31 and top of tree.

 Jocke

OOPS, found a bug. Use this one instead:

.31 - no change, it worked before your patch and it works after.
None of your debugging printks show up. I tried removing the tlbil_va()
from do_dcache_icache_coherency() and userspace goes back to be being
slow/non functional.

top of tree - userspace is slow and unstable, random segfaults,
and none of your debugging printks show up :(

OK, something strange is going on. I am starting to suspect that there
is some other problem here.

If my patch is any good you should be able to use dcbx insn in copy_tofrom_user().
You could try changing all CONFIG_8xx to CONFIG_8xx_deleted arch/powerpc/lib/copy_32.S
and see if that works and if you see any debug prints.

 Jocke