Re: [PATCH] ppc64: Fix possible race with set_pte on a present PTE

Martin Schwidefsky
2004-06-01T12:10:53Z

> I did the ppc64 impl, the x86 one (hope I got it right). I still need to
> do ppc32 and I suppose s390 must be fixed now that ptep_estabish is gone
> but I'll leave that to someone who understand something about these
things ;)

At the moment I can't access linux.bkbits.net so I can't test anything but
as far as I can tell s390 should just work as is. ptep_establish is gone
but it has been replaced by correct sequences: ptep_clear_flush & set_pte
and set_pte & flush_tlb_page. The second sequence can be optimized to a
ptep_clear_flush & set_pte if the _PAGE_RO bit has changed. Apart from
that s390 is perfectly fine with the change.

blue skies,
Martin

Linux/390 Design & Development, IBM Deutschland Entwicklung GmbH
Schonaicherstr. 220, D-71032 Boblingen, Telefon: 49 - (0)7031 - 16-2247
E-Mail: schwidefsky@de.ibm.com