Joakim Tjernlund writes:

quoted

OK, I wasn't aware that you can have dirty pages without _PAGE_RW.

Yes, think about what happens if a process has a writable dirty page
(in a private or anonymous mapping) and the process does a fork.  The
page becomes copy-on-write, so we have to make it non-writable, but it
is still dirty.

Yes, that makes sense. Thanks.

Whether the kernel actually ever calls pte_mkdirty on a non-writable
page is a different question, of course. :)

I don't think the kernel calls pte_mkdirty in this case. I tried it on my mpc862 system and it worked fine.
I was just trying to avoid DTLB errors.

   Jocke

PS.
  Could comment on my previous post about cacheable_memcpy() as well?
  http://lists.linuxppc.org/linuxppc-dev/200304/msg00057.html

** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/