X-Git-Url: http://git.cascardo.info/?p=cascardo%2Flinux.git;a=blobdiff_plain;f=arch%2Fx86%2Fmm%2Fpageattr.c;h=536ea2fb6e335677df559390520c3312976dcb81;hp=dfaf2e0f5f8fc504908266cd1767e16fb64afaff;hb=eb64c3c6cdb8fa8a4d324eb71a9033b62e150918;hpb=61de8e53640ceeda564a65170a46c1edc2b37e11

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index dfaf2e0f5f8f..536ea2fb6e33 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -383,6 +383,26 @@ static pte_t *_lookup_address_cpa(struct cpa_data *cpa, unsigned long address,
         return lookup_address(address, level);
 }
 
+/*
+ * Lookup the PMD entry for a virtual address. Return a pointer to the entry
+ * or NULL if not present.
+ */
+pmd_t *lookup_pmd_address(unsigned long address)
+{
+	pgd_t *pgd;
+	pud_t *pud;
+
+	pgd = pgd_offset_k(address);
+	if (pgd_none(*pgd))
+		return NULL;
+
+	pud = pud_offset(pgd, address);
+	if (pud_none(*pud) || pud_large(*pud) || !pud_present(*pud))
+		return NULL;
+
+	return pmd_offset(pud, address);
+}
+
 /*
  * This is necessary because __pa() does not work on some
  * kinds of memory, like vmalloc() or the alloc_remap()