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-rw-r--r--include/asm-ppc/pgtable.h9
1 files changed, 7 insertions, 2 deletions
diff --git a/include/asm-ppc/pgtable.h b/include/asm-ppc/pgtable.h
index 2e88cd9feff..e135b4aba9f 100644
--- a/include/asm-ppc/pgtable.h
+++ b/include/asm-ppc/pgtable.h
@@ -431,10 +431,15 @@ extern unsigned long bad_call_to_PMD_PAGE_SIZE(void);
* Conversions between PTE values and page frame numbers.
*/
-#define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT)
+/* in some case we want to additionaly adjust where the pfn is in the pte to
+ * allow room for more flags */
+#define PFN_SHIFT_OFFSET (PAGE_SHIFT)
+
+#define pte_pfn(x) (pte_val(x) >> PFN_SHIFT_OFFSET)
#define pte_page(x) pfn_to_page(pte_pfn(x))
-#define pfn_pte(pfn, prot) __pte(((pte_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
+#define pfn_pte(pfn, prot) __pte(((pte_basic_t)(pfn) << PFN_SHIFT_OFFSET) |\
+ pgprot_val(prot))
#define mk_pte(page, prot) pfn_pte(page_to_pfn(page), prot)
/*