Merge ../torvalds-2.6/

[pandora-kernel.git] / arch / ia64 / mm / init.c

diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index 547785e..1281c60 100644 (file)
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -305,8 +305,9 @@ setup_gate (void)
        struct page *page;
 
        /*
-        * Map the gate page twice: once read-only to export the ELF headers etc. and once
-        * execute-only page to enable privilege-promotion via "epc":
+        * Map the gate page twice: once read-only to export the ELF
+        * headers etc. and once execute-only page to enable
+        * privilege-promotion via "epc":
         */
        page = virt_to_page(ia64_imva(__start_gate_section));
        put_kernel_page(page, GATE_ADDR, PAGE_READONLY);
@@ -315,6 +316,20 @@ setup_gate (void)
        put_kernel_page(page, GATE_ADDR + PAGE_SIZE, PAGE_GATE);
 #else
        put_kernel_page(page, GATE_ADDR + PERCPU_PAGE_SIZE, PAGE_GATE);
+       /* Fill in the holes (if any) with read-only zero pages: */
+       {
+               unsigned long addr;
+
+               for (addr = GATE_ADDR + PAGE_SIZE;
+                    addr < GATE_ADDR + PERCPU_PAGE_SIZE;
+                    addr += PAGE_SIZE)
+               {
+                       put_kernel_page(ZERO_PAGE(0), addr,
+                                       PAGE_READONLY);
+                       put_kernel_page(ZERO_PAGE(0), addr + PERCPU_PAGE_SIZE,
+                                       PAGE_READONLY);
+               }
+       }
 #endif
        ia64_patch_gate();
 }
@@ -367,13 +382,22 @@ ia64_mmu_init (void *my_cpu_data)
 
        if (impl_va_bits < 51 || impl_va_bits > 61)
                panic("CPU has bogus IMPL_VA_MSB value of %lu!\n", impl_va_bits - 1);
+       /*
+        * mapped_space_bits - PAGE_SHIFT is the total number of ptes we need,
+        * which must fit into "vmlpt_bits - pte_bits" slots. Second half of
+        * the test makes sure that our mapped space doesn't overlap the
+        * unimplemented hole in the middle of the region.
+        */
+       if ((mapped_space_bits - PAGE_SHIFT > vmlpt_bits - pte_bits) ||
+           (mapped_space_bits > impl_va_bits - 1))
+               panic("Cannot build a big enough virtual-linear page table"
+                     " to cover mapped address space.\n"
+                     " Try using a smaller page size.\n");
+
 
        /* place the VMLPT at the end of each page-table mapped region: */
        pta = POW2(61) - POW2(vmlpt_bits);
 
-       if (POW2(mapped_space_bits) >= pta)
-               panic("mm/init: overlap between virtually mapped linear page table and "
-                     "mapped kernel space!");
        /*
         * Set the (virtually mapped linear) page table address.  Bit
         * 8 selects between the short and long format, bits 2-7 the
@@ -582,7 +606,8 @@ mem_init (void)
        kclist_add(&kcore_kernel, _stext, _end - _stext);
 
        for_each_pgdat(pgdat)
-               totalram_pages += free_all_bootmem_node(pgdat);
+               if (pgdat->bdata->node_bootmem_map)
+                       totalram_pages += free_all_bootmem_node(pgdat);
 
        reserved_pages = 0;
        efi_memmap_walk(count_reserved_pages, &reserved_pages);