1 files changed, 38 insertions, 1 deletions

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 241c24a1c18f..e7113d0b8168 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -14,6 +14,7 @@
 #include <linux/bootmem.h>
 #include <linux/mman.h>
 #include <linux/nodemask.h>
+#include <linux/sort.h>
 
 #include <asm/cputype.h>
 #include <asm/mach-types.h>
@@ -603,7 +604,7 @@ static void __init create_36bit_mapping(struct map_desc *md,
  * offsets, and we take full advantage of sections and
  * supersections.
  */
-void __init create_mapping(struct map_desc *md)
+static void __init create_mapping(struct map_desc *md)
 {
         unsigned long phys, addr, length, end;
         const struct mem_type *type;
@@ -1017,6 +1018,39 @@ static void __init kmap_init(void)
 #endif
 }
 
+static inline void map_memory_bank(struct membank *bank)
+{
+        struct map_desc map;
+
+        map.pfn = bank_pfn_start(bank);
+        map.virtual = __phys_to_virt(bank_phys_start(bank));
+        map.length = bank_phys_size(bank);
+        map.type = MT_MEMORY;
+
+        create_mapping(&map);
+}
+
+static void __init map_lowmem(void)
+{
+        struct meminfo *mi = &meminfo;
+        int i;
+
+        /* Map all the lowmem memory banks. */
+        for (i = 0; i < mi->nr_banks; i++) {
+                struct membank *bank = &mi->bank[i];
+
+                if (!bank->highmem)
+                        map_memory_bank(bank);
+        }
+}
+
+static int __init meminfo_cmp(const void *_a, const void *_b)
+{
+        const struct membank *a = _a, *b = _b;
+        long cmp = bank_pfn_start(a) - bank_pfn_start(b);
+        return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
+}
+
 /*
  * paging_init() sets up the page tables, initialises the zone memory
  * maps, and sets up the zero page, bad page and bad page tables.
@@ -1025,9 +1059,12 @@ void __init paging_init(struct machine_desc *mdesc)
 {
         void *zero_page;
 
+        sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
+
         build_mem_type_table();
         sanity_check_meminfo();
         prepare_page_table();
+        map_lowmem();
         bootmem_init();
         devicemaps_init(mdesc);
         kmap_init();