1 files changed, 15 insertions, 3 deletions

diff --git a/arch/i386/mm/init.c b/arch/i386/mm/init.c
index e8545dcf06c5..dbe16f63a566 100644
--- a/arch/i386/mm/init.c
+++ b/arch/i386/mm/init.c
@@ -745,6 +745,8 @@ struct kmem_cache *pmd_cache;
 
 void __init pgtable_cache_init(void)
 {
+        size_t pgd_size = PTRS_PER_PGD*sizeof(pgd_t);
+
         if (PTRS_PER_PMD > 1) {
                 pmd_cache = kmem_cache_create("pmd",
                                         PTRS_PER_PMD*sizeof(pmd_t),
@@ -754,13 +756,23 @@ void __init pgtable_cache_init(void)
                                         NULL);
                 if (!pmd_cache)
                         panic("pgtable_cache_init(): cannot create pmd cache");
+
+                if (!SHARED_KERNEL_PMD) {
+                        /* If we're in PAE mode and have a non-shared
+                           kernel pmd, then the pgd size must be a
+                           page size.  This is because the pgd_list
+                           links through the page structure, so there
+                           can only be one pgd per page for this to
+                           work. */
+                        pgd_size = PAGE_SIZE;
+                }
         }
         pgd_cache = kmem_cache_create("pgd",
-                                PTRS_PER_PGD*sizeof(pgd_t),
-                                PTRS_PER_PGD*sizeof(pgd_t),
+                                pgd_size,
+                                pgd_size,
                                 0,
                                 pgd_ctor,
-                                PTRS_PER_PMD == 1 ? pgd_dtor : NULL);
+                                (!SHARED_KERNEL_PMD) ? pgd_dtor : NULL);
         if (!pgd_cache)
                 panic("pgtable_cache_init(): Cannot create pgd cache");
 }