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arch/tile: don't set the homecache of a PTE unless appropriate 

We make sure not to try to set the home for an MMIO PTE (on tilegx)
or a PTE that isn't referencing memory managed by Linux.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf 2012-03-29 15:36:53 -04:00
parent 48292738d0
commit 12400f1f22
1 changed files with 12 additions and 4 deletions
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16
arch/tile/mm/pgtable.c
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@ -469,10 +469,18 @@ void __set_pte(pte_t *ptep, pte_t pte)
void set_pte(pte_t *ptep, pte_t pte)
{
struct page *page = pfn_to_page(pte_pfn(pte));
/* Update the home of a PTE if necessary */
pte = pte_set_home(pte, page_home(page));
if (pte_present(pte) &&
(!CHIP_HAS_MMIO() || hv_pte_get_mode(pte) != HV_PTE_MODE_MMIO)) {
/* The PTE actually references physical memory. */
unsigned long pfn = pte_pfn(pte);
if (pfn_valid(pfn)) {
/* Update the home of the PTE from the struct page. */
pte = pte_set_home(pte, page_home(pfn_to_page(pfn)));
} else if (hv_pte_get_mode(pte) == 0) {
/* remap_pfn_range(), etc, must supply PTE mode. */
panic("set_pte(): out-of-range PFN and mode 0\n");
}
}
__set_pte(ptep, pte);
}