On Tue, Jul 29, 2008 at 05:53:48PM -0700, David Francisco Rodriguez Perez wrote:
> So I was able to do the unmapping from the user space process page table
> inside UML using:
>
> pgdp = pgd_offset(mm, addr);
> if (pgdp == NULL) return;
> pudp = pud_offset(pgdp, addr);
> if (pudp == NULL) return;
> pmdp = pmd_offset(pudp, addr);
> if (pmdp == NULL) return;
> ptep = pte_offset_map_lock(mm, pmdp, addr, &ptlp);
> if (ptep == NULL) return;
> ptep_get_and_clear(mm,addr,ptep);
> pte_unmap_unlock(ptep, ptlp);
>
> and then decresing on purpose the map_count by 1 (only the kernel and 1 user
> process maximum sees that page) so that the vm_insert_page method can be
> called for that same page later on.
This looks pretty horrible. Have you looked at whether there are
munmap helpers you could use? They would take care of the TLB flush
as well.
Jeff
--
Work email - jdike at linux dot intel dot com
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