Commit 12400f1f authored by Chris Metcalf's avatar Chris Metcalf
Browse files

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: default avatarChris Metcalf <cmetcalf@tilera.com>
parent 48292738

arch/tile/mm/pgtable.c

+12 −4
Original line number Diff line number Diff line
@@ -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);

}