Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[safe/jmp/linux-2.6] / arch / powerpc / mm / pgtable_32.c

diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index cd56097..58bcaeb 100644 (file)
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -61,31 +61,36 @@ void setbat(int index, unsigned long virt, phys_addr_t phys,
 
 #ifdef HAVE_TLBCAM
 extern unsigned int tlbcam_index;
-extern unsigned long v_mapped_by_tlbcam(unsigned long va);
-extern unsigned long p_mapped_by_tlbcam(unsigned long pa);
+extern phys_addr_t v_mapped_by_tlbcam(unsigned long va);
+extern unsigned long p_mapped_by_tlbcam(phys_addr_t pa);
 #else /* !HAVE_TLBCAM */
 #define v_mapped_by_tlbcam(x)  (0UL)
 #define p_mapped_by_tlbcam(x)  (0UL)
 #endif /* HAVE_TLBCAM */
 
-#ifdef CONFIG_PTE_64BIT
-/* Some processors use an 8kB pgdir because they have 8-byte Linux PTEs. */
-#define PGDIR_ORDER    1
-#else
-#define PGDIR_ORDER    0
-#endif
+#define PGDIR_ORDER    (32 + PGD_T_LOG2 - PGDIR_SHIFT)
 
 pgd_t *pgd_alloc(struct mm_struct *mm)
 {
        pgd_t *ret;
 
-       ret = (pgd_t *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, PGDIR_ORDER);
+       /* pgdir take page or two with 4K pages and a page fraction otherwise */
+#ifndef CONFIG_PPC_4K_PAGES
+       ret = (pgd_t *)kzalloc(1 << PGDIR_ORDER, GFP_KERNEL);
+#else
+       ret = (pgd_t *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
+                       PGDIR_ORDER - PAGE_SHIFT);
+#endif
        return ret;
 }
 
 void pgd_free(struct mm_struct *mm, pgd_t *pgd)
 {
-       free_pages((unsigned long)pgd, PGDIR_ORDER);
+#ifndef CONFIG_PPC_4K_PAGES
+       kfree((void *)pgd);
+#else
+       free_pages((unsigned long)pgd, PGDIR_ORDER - PAGE_SHIFT);
+#endif
 }
 
 __init_refok pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
@@ -261,7 +266,8 @@ int map_page(unsigned long va, phys_addr_t pa, int flags)
                /* The PTE should never be already set nor present in the
                 * hash table
                 */
-               BUG_ON(pte_val(*pg) & (_PAGE_PRESENT | _PAGE_HASHPTE));
+               BUG_ON((pte_val(*pg) & (_PAGE_PRESENT | _PAGE_HASHPTE)) &&
+                      flags);
                set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT,
                                                     __pgprot(flags)));
        }
@@ -269,7 +275,7 @@ int map_page(unsigned long va, phys_addr_t pa, int flags)
 }
 
 /*
- * Map in a big chunk of physical memory starting at KERNELBASE.
+ * Map in a big chunk of physical memory starting at PAGE_OFFSET.
  */
 void __init mapin_ram(void)
 {
@@ -278,7 +284,7 @@ void __init mapin_ram(void)
        int ktext;
 
        s = mmu_mapin_ram();
-       v = KERNELBASE + s;
+       v = PAGE_OFFSET + s;
        p = memstart_addr + s;
        for (; s < total_lowmem; s += PAGE_SIZE) {
                ktext = ((char *) v >= _stext && (char *) v < etext);
@@ -385,7 +391,7 @@ void kernel_map_pages(struct page *page, int numpages, int enable)
 #endif /* CONFIG_DEBUG_PAGEALLOC */
 
 static int fixmaps;
-unsigned long FIXADDR_TOP = 0xfffff000;
+unsigned long FIXADDR_TOP = (-PAGE_SIZE);
 EXPORT_SYMBOL(FIXADDR_TOP);
 
 void __set_fixmap (enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags)