1 files changed, 17 insertions, 28 deletions

diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index 7154d1ce9785..59f4cc18235b 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -84,30 +84,22 @@ static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
         pmd_t *pmd;
         pte_t *pte;
 
-        pgd = swapper_pg_dir + pgd_index(addr);
+        pgd = pgd_offset_k(addr);
         if (pgd_none(*pgd)) {
                 pgd_ERROR(*pgd);
                 return;
         }
 
-        pud = pud_offset(pgd, addr);
-        if (pud_none(*pud)) {
-                pmd = (pmd_t *)get_zeroed_page(GFP_ATOMIC);
-                set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER));
-                if (pmd != pmd_offset(pud, 0)) {
-                        pud_ERROR(*pud);
-                        return;
-                }
+        pud = pud_alloc(NULL, pgd, addr);
+        if (unlikely(!pud)) {
+                pud_ERROR(*pud);
+                return;
         }
 
-        pmd = pmd_offset(pud, addr);
-        if (pmd_none(*pmd)) {
-                pte = (pte_t *)get_zeroed_page(GFP_ATOMIC);
-                set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER));
-                if (pte != pte_offset_kernel(pmd, 0)) {
-                        pmd_ERROR(*pmd);
-                        return;
-                }
+        pmd = pmd_alloc(NULL, pud, addr);
+        if (unlikely(!pmd)) {
+                pmd_ERROR(*pmd);
+                return;
         }
 
         pte = pte_offset_kernel(pmd, addr);
@@ -155,9 +147,6 @@ extern char __init_begin, __init_end;
 
 /*
  * paging_init() sets up the page tables
- *
- * This routines also unmaps the page at virtual kernel address 0, so
- * that we can trap those pesky NULL-reference errors in the kernel.
  */
 void __init paging_init(void)
 {
@@ -180,14 +169,11 @@ void __init paging_init(void)
          */
         {
                 unsigned long max_dma, low, start_pfn;
-                pgd_t *pg_dir;
-                int i;
-
-                /* We don't need kernel mapping as hardware support that. */
-                pg_dir = swapper_pg_dir;
 
-                for (i = 0; i < PTRS_PER_PGD; i++)
-                        pgd_val(pg_dir[i]) = 0;
+                /* We don't need to map the kernel through the TLB, as
+                 * it is permanatly mapped using P1. So clear the
+                 * entire pgd. */
+                memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
 
                 /* Turn on the MMU */
                 enable_mmu();
@@ -206,6 +192,10 @@ void __init paging_init(void)
                 }
         }
 
+        /* Set an initial value for the MMU.TTB so we don't have to
+         * check for a null value. */
+        set_TTB(swapper_pg_dir);
+
 #elif defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH4)
         /*
          * If we don't have CONFIG_MMU set and the processor in question
@@ -227,7 +217,6 @@ static struct kcore_list kcore_mem, kcore_vmalloc;
 
 void __init mem_init(void)
 {
-        extern unsigned long empty_zero_page[1024];
         int codesize, reservedpages, datasize, initsize;
         int tmp;
         extern unsigned long memory_start;