Merge branch 'linus' into x86/memory-corruption-check
[linux-2.6.git] / arch / x86 / mm / init_64.c
index d6ef1589b95a876ff02c4619bd9d37f245c3bdcd..9f7a0d24d42a93b47e36d3ce40c70876f5d09e16 100644 (file)
@@ -350,8 +350,10 @@ phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end,
                 * pagetable pages as RO. So assume someone who pre-setup
                 * these mappings are more intelligent.
                 */
-               if (pte_val(*pte))
+               if (pte_val(*pte)) {
+                       pages++;
                        continue;
+               }
 
                if (0)
                        printk("   pte=%p addr=%lx pte=%016lx\n",
@@ -418,8 +420,10 @@ phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end,
                         * not differ with respect to page frame and
                         * attributes.
                         */
-                       if (page_size_mask & (1 << PG_LEVEL_2M))
+                       if (page_size_mask & (1 << PG_LEVEL_2M)) {
+                               pages++;
                                continue;
+                       }
                        new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd));
                }
 
@@ -499,8 +503,10 @@ phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end,
                         * not differ with respect to page frame and
                         * attributes.
                         */
-                       if (page_size_mask & (1 << PG_LEVEL_1G))
+                       if (page_size_mask & (1 << PG_LEVEL_1G)) {
+                               pages++;
                                continue;
+                       }
                        prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud));
                }
 
@@ -665,12 +671,13 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
        unsigned long last_map_addr = 0;
        unsigned long page_size_mask = 0;
        unsigned long start_pfn, end_pfn;
+       unsigned long pos;
 
        struct map_range mr[NR_RANGE_MR];
        int nr_range, i;
        int use_pse, use_gbpages;
 
-       printk(KERN_INFO "init_memory_mapping\n");
+       printk(KERN_INFO "init_memory_mapping: %016lx-%016lx\n", start, end);
 
        /*
         * Find space for the kernel direct mapping tables.
@@ -704,35 +711,50 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
 
        /* head if not big page alignment ?*/
        start_pfn = start >> PAGE_SHIFT;
-       end_pfn = ((start + (PMD_SIZE - 1)) >> PMD_SHIFT)
+       pos = start_pfn << PAGE_SHIFT;
+       end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT)
                        << (PMD_SHIFT - PAGE_SHIFT);
-       nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
+       if (start_pfn < end_pfn) {
+               nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
+               pos = end_pfn << PAGE_SHIFT;
+       }
 
        /* big page (2M) range*/
-       start_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT)
+       start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
                         << (PMD_SHIFT - PAGE_SHIFT);
-       end_pfn = ((start + (PUD_SIZE - 1))>>PUD_SHIFT)
+       end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
                         << (PUD_SHIFT - PAGE_SHIFT);
-       if (end_pfn > ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT)))
-               end_pfn = ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT));
-       nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
-                       page_size_mask & (1<<PG_LEVEL_2M));
+       if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)))
+               end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT));
+       if (start_pfn < end_pfn) {
+               nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
+                               page_size_mask & (1<<PG_LEVEL_2M));
+               pos = end_pfn << PAGE_SHIFT;
+       }
 
        /* big page (1G) range */
-       start_pfn = end_pfn;
-       end_pfn = (end>>PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT);
-       nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
+       start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
+                        << (PUD_SHIFT - PAGE_SHIFT);
+       end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT);
+       if (start_pfn < end_pfn) {
+               nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
                                page_size_mask &
                                 ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G)));
+               pos = end_pfn << PAGE_SHIFT;
+       }
 
        /* tail is not big page (1G) alignment */
-       start_pfn = end_pfn;
-       end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
-       nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
-                       page_size_mask & (1<<PG_LEVEL_2M));
+       start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
+                        << (PMD_SHIFT - PAGE_SHIFT);
+       end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
+       if (start_pfn < end_pfn) {
+               nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
+                               page_size_mask & (1<<PG_LEVEL_2M));
+               pos = end_pfn << PAGE_SHIFT;
+       }
 
        /* tail is not big page (2M) alignment */
-       start_pfn = end_pfn;
+       start_pfn = pos>>PAGE_SHIFT;
        end_pfn = end>>PAGE_SHIFT;
        nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
 
@@ -831,12 +853,12 @@ int arch_add_memory(int nid, u64 start, u64 size)
        unsigned long nr_pages = size >> PAGE_SHIFT;
        int ret;
 
-       last_mapped_pfn = init_memory_mapping(start, start + size-1);
+       last_mapped_pfn = init_memory_mapping(start, start + size);
        if (last_mapped_pfn > max_pfn_mapped)
                max_pfn_mapped = last_mapped_pfn;
 
        ret = __add_pages(zone, start_pfn, nr_pages);
-       WARN_ON(1);
+       WARN_ON_ONCE(ret);
 
        return ret;
 }
@@ -878,6 +900,7 @@ static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel,
 void __init mem_init(void)
 {
        long codesize, reservedpages, datasize, initsize;
+       unsigned long absent_pages;
 
        pci_iommu_alloc();
 
@@ -891,8 +914,9 @@ void __init mem_init(void)
 #else
        totalram_pages = free_all_bootmem();
 #endif
-       reservedpages = max_pfn - totalram_pages -
-                                       absent_pages_in_range(0, max_pfn);
+
+       absent_pages = absent_pages_in_range(0, max_pfn);
+       reservedpages = max_pfn - totalram_pages - absent_pages;
        after_bootmem = 1;
 
        codesize =  (unsigned long) &_etext - (unsigned long) &_text;
@@ -909,10 +933,11 @@ void __init mem_init(void)
                                 VSYSCALL_END - VSYSCALL_START);
 
        printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
-                               "%ldk reserved, %ldk data, %ldk init)\n",
+                        "%ldk absent, %ldk reserved, %ldk data, %ldk init)\n",
                (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
                max_pfn << (PAGE_SHIFT-10),
                codesize >> 10,
+               absent_pages << (PAGE_SHIFT-10),
                reservedpages << (PAGE_SHIFT-10),
                datasize >> 10,
                initsize >> 10);