Merge branch 'x86/mm2' into x86/mm

x86/mm2 is testing out fine, but has developed conflicts with x86/mm
due to patches in adjacent code.  Merge them so we can drop x86/mm2
and have a unified branch.

Resolved Conflicts:
	arch/x86/kernel/setup.c

diff --cc arch/x86/kernel/setup.c
index 0aebd77,be6e435..878cf1d
--- 1/arch/x86/kernel/setup.c
--- 2/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@@ -708,8 -747,27 +744,29 @@@ static void __init trim_bios_range(void
        sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
  }
  
+ /* called before trim_bios_range() to spare extra sanitize */
+ static void __init e820_add_kernel_range(void)
+ {
+       u64 start = __pa_symbol(_text);
+       u64 size = __pa_symbol(_end) - start;
+ 
+       /*
+        * Complain if .text .data and .bss are not marked as E820_RAM and
+        * attempt to fix it by adding the range. We may have a confused BIOS,
+        * or the user may have used memmap=exactmap or memmap=xxM$yyM to
+        * exclude kernel range. If we really are running on top non-RAM,
+        * we will crash later anyways.
+        */
+       if (e820_all_mapped(start, start + size, E820_RAM))
+               return;
+ 
+       pr_warn(".text .data .bss are not marked as E820_RAM!\n");
+       e820_remove_range(start, size, E820_RAM, 0);
+       e820_add_region(start, size, E820_RAM);
+ }
+ 
 +static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
 +
  static int __init parse_reservelow(char *p)
  {
        unsigned long long size;
@@@ -985,42 -1052,21 +1056,22 @@@ void __init setup_arch(char **cmdline_p
        setup_bios_corruption_check();
  #endif
  
+ #ifdef CONFIG_X86_32
        printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
                        (max_pfn_mapped<<PAGE_SHIFT) - 1);
+ #endif
  
-       setup_real_mode();
+       reserve_real_mode();
  
        trim_platform_memory_ranges();
 +      trim_low_memory_range();
  
-       init_gbpages();
- 
-       /* max_pfn_mapped is updated here */
-       max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
-       max_pfn_mapped = max_low_pfn_mapped;
- 
- #ifdef CONFIG_X86_64
-       if (max_pfn > max_low_pfn) {
-               int i;
-               unsigned long start, end;
-               unsigned long start_pfn, end_pfn;
- 
-               for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn,
-                                                        NULL) {
+       init_mem_mapping();
  
-                       end = PFN_PHYS(end_pfn);
-                       if (end <= (1UL<<32))
-                               continue;
+       early_trap_pf_init();
  
-                       start = PFN_PHYS(start_pfn);
-                       max_pfn_mapped = init_memory_mapping(
-                                               max((1UL<<32), start), end);
-               }
+       setup_real_mode();
  
-               /* can we preseve max_low_pfn ?*/
-               max_low_pfn = max_pfn;
-       }
- #endif
        memblock.current_limit = get_max_mapped();
        dma_contiguous_reserve(0);