_PAGE_HWWRITE missing in pte_mkdirty()?
Joakim.Tjernlund at lumentis.se
Sun Apr 27 19:31:58 EST 2003
> Joakim Tjernlund writes:
> > 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.
Could comment on my previous post about cacheable_memcpy() as well?
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