--- "Raghu R. Arur" <rra2002@aria.ncl.cs.columbia.edu>
wrote:
>
> Hi,
>
> I am trying to understand remap_pte_range in 2.4.19
> kernel. The name of the function and the comment suggests
> that a range of pte are cleared and set to new pages.
The function name is a little misleading. In fact, in the
current 2.5.x kernel, it doesn't even clear the old pte.
The old pte should be cleared before calling
remap_pte_range.
> But the code just clears the ptes and does not set the
> pte entry to a new page.
Not exactly. It does set the pte in some cases:
> page = virt_to_page(__va(phys_addr));
> if ((!VALID_PAGE(page)) || PageReserved(page))
> set_pte(pte, mk_pte_phys(phys_addr, prot));
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
In all other cases, the page fault handler will set the
correct pte.
-Ravi.
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