Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  xen: update mask_rw_pte after kernel page tables init changes
  xen: set max_pfn_mapped to the last pfn mapped
  x86: Cleanup highmap after brk is concluded

Fix up trivial onflict (added header file includes) in
arch/x86/mm/init_64.c

4 files changed, 21 insertions, 39 deletions

diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 2d2673c28aff..5655c2272adb 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -77,9 +77,6 @@ void __init x86_64_start_kernel(char * real_mode_data)
         /* Make NULL pointers segfault */
         zap_identity_mappings();
 
-        /* Cleanup the over mapped high alias */
-        cleanup_highmap();
-
         max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT;
 
         for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) {
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 9d43b28e0728..32bd87cbf982 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -294,30 +294,11 @@ static void __init init_gbpages(void)
         else
                 direct_gbpages = 0;
 }
-
-static void __init cleanup_highmap_brk_end(void)
-{
-        pud_t *pud;
-        pmd_t *pmd;
-
-        mmu_cr4_features = read_cr4();
-
-        /*
-         * _brk_end cannot change anymore, but it and _end may be
-         * located on different 2M pages. cleanup_highmap(), however,
-         * can only consider _end when it runs, so destroy any
-         * mappings beyond _brk_end here.
-         */
-        pud = pud_offset(pgd_offset_k(_brk_end), _brk_end);
-        pmd = pmd_offset(pud, _brk_end - 1);
-        while (++pmd <= pmd_offset(pud, (unsigned long)_end - 1))
-                pmd_clear(pmd);
-}
 #else
 static inline void init_gbpages(void)
 {
 }
-static inline void cleanup_highmap_brk_end(void)
+static void __init cleanup_highmap(void)
 {
 }
 #endif
@@ -330,8 +311,6 @@ static void __init reserve_brk(void)
         /* Mark brk area as locked down and no longer taking any
            new allocations */
         _brk_start = 0;
-
-        cleanup_highmap_brk_end();
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
@@ -950,6 +929,8 @@ void __init setup_arch(char **cmdline_p)
          */
         reserve_brk();
 
+        cleanup_highmap();
+
         memblock.current_limit = get_max_mapped();
         memblock_x86_fill();
 
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 0aa34669ed3f..2362b646178e 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -52,6 +52,7 @@
 #include <asm/cacheflush.h>
 #include <asm/init.h>
 #include <asm/uv/uv.h>
+#include <asm/setup.h>
 
 static int __init parse_direct_gbpages_off(char *arg)
 {
@@ -294,18 +295,18 @@ void __init init_extra_mapping_uc(unsigned long phys, unsigned long size)
  * to the compile time generated pmds. This results in invalid pmds up
  * to the point where we hit the physaddr 0 mapping.
  *
- * We limit the mappings to the region from _text to _end.  _end is
- * rounded up to the 2MB boundary. This catches the invalid pmds as
+ * We limit the mappings to the region from _text to _brk_end.  _brk_end
+ * is rounded up to the 2MB boundary. This catches the invalid pmds as
  * well, as they are located before _text:
  */
 void __init cleanup_highmap(void)
 {
         unsigned long vaddr = __START_KERNEL_map;
-        unsigned long end = roundup((unsigned long)_end, PMD_SIZE) - 1;
+        unsigned long vaddr_end = __START_KERNEL_map + (max_pfn_mapped << PAGE_SHIFT);
+        unsigned long end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1;
         pmd_t *pmd = level2_kernel_pgt;
-        pmd_t *last_pmd = pmd + PTRS_PER_PMD;
 
-        for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) {
+        for (; vaddr + PMD_SIZE - 1 < vaddr_end; pmd++, vaddr += PMD_SIZE) {
                 if (pmd_none(*pmd))
                         continue;
                 if (vaddr < (unsigned long) _text || vaddr > end)
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 39ee7182fd18..c82df6c9c0f0 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1487,10 +1487,12 @@ static __init pte_t mask_rw_pte(pte_t *ptep, pte_t pte)
         /*
          * If the new pfn is within the range of the newly allocated
          * kernel pagetable, and it isn't being mapped into an
-         * early_ioremap fixmap slot, make sure it is RO.
+         * early_ioremap fixmap slot as a freshly allocated page, make sure
+         * it is RO.
          */
-        if (!is_early_ioremap_ptep(ptep) &&
-            pfn >= pgt_buf_start && pfn < pgt_buf_end)
+        if (((!is_early_ioremap_ptep(ptep) &&
+                        pfn >= pgt_buf_start && pfn < pgt_buf_end)) ||
+                        (is_early_ioremap_ptep(ptep) && pfn != (pgt_buf_end - 1)))
                 pte = pte_wrprotect(pte);
 
         return pte;
@@ -1700,9 +1702,6 @@ static __init void xen_map_identity_early(pmd_t *pmd, unsigned long max_pfn)
                 for (pteidx = 0; pteidx < PTRS_PER_PTE; pteidx++, pfn++) {
                         pte_t pte;
 
-                        if (pfn > max_pfn_mapped)
-                                max_pfn_mapped = pfn;
-
                         if (!pte_none(pte_page[pteidx]))
                                 continue;
 
@@ -1760,6 +1759,12 @@ __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd,
         pud_t *l3;
         pmd_t *l2;
 
+        /* max_pfn_mapped is the last pfn mapped in the initial memory
+         * mappings. Considering that on Xen after the kernel mappings we
+         * have the mappings of some pages that don't exist in pfn space, we
+         * set max_pfn_mapped to the last real pfn mapped. */
+        max_pfn_mapped = PFN_DOWN(__pa(xen_start_info->mfn_list));
+
         /* Zap identity mapping */
         init_level4_pgt[0] = __pgd(0);
 
@@ -1864,9 +1869,7 @@ __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd,
         initial_kernel_pmd =
                 extend_brk(sizeof(pmd_t) * PTRS_PER_PMD, PAGE_SIZE);
 
-        max_pfn_mapped = PFN_DOWN(__pa(xen_start_info->pt_base) +
-                                  xen_start_info->nr_pt_frames * PAGE_SIZE +
-                                  512*1024);
+        max_pfn_mapped = PFN_DOWN(__pa(xen_start_info->mfn_list));
 
         kernel_pmd = m2v(pgd[KERNEL_PGD_BOUNDARY].pgd);
         memcpy(initial_kernel_pmd, kernel_pmd, sizeof(pmd_t) * PTRS_PER_PMD);