1 files changed, 35 insertions, 38 deletions

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index c32f731d56d3..72ad3e1f56cf 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -14,7 +14,6 @@
 #include <linux/mman.h>
 #include <linux/nodemask.h>
 #include <linux/memblock.h>
-#include <linux/sort.h>
 #include <linux/fs.h>
 
 #include <asm/cputype.h>
@@ -265,17 +264,17 @@ static struct mem_type mem_types[] = {
                 .domain    = DOMAIN_KERNEL,
         },
         [MT_MEMORY_DTCM] = {
-                .prot_pte       = L_PTE_PRESENT | L_PTE_YOUNG |
-                                  L_PTE_DIRTY | L_PTE_WRITE,
-                .prot_l1        = PMD_TYPE_TABLE,
-                .prot_sect      = PMD_TYPE_SECT | PMD_SECT_XN,
-                .domain         = DOMAIN_KERNEL,
+                .prot_pte  = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
+                                L_PTE_WRITE,
+                .prot_l1   = PMD_TYPE_TABLE,
+                .prot_sect = PMD_TYPE_SECT | PMD_SECT_XN,
+                .domain    = DOMAIN_KERNEL,
         },
         [MT_MEMORY_ITCM] = {
                 .prot_pte  = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
-                                L_PTE_USER | L_PTE_EXEC,
+                                L_PTE_WRITE | L_PTE_EXEC,
                 .prot_l1   = PMD_TYPE_TABLE,
-                .domain    = DOMAIN_IO,
+                .domain    = DOMAIN_KERNEL,
         },
 };
 
@@ -745,13 +744,14 @@ static int __init early_vmalloc(char *arg)
 }
 early_param("vmalloc", early_vmalloc);
 
-phys_addr_t lowmem_end_addr;
+static phys_addr_t lowmem_limit __initdata = 0;
 
 static void __init sanity_check_meminfo(void)
 {
         int i, j, highmem = 0;
 
-        lowmem_end_addr = __pa(vmalloc_min - 1) + 1;
+        lowmem_limit = __pa(vmalloc_min - 1) + 1;
+        memblock_set_current_limit(lowmem_limit);
 
         for (i = 0, j = 0; i < meminfo.nr_banks; i++) {
                 struct membank *bank = &meminfo.bank[j];
@@ -852,6 +852,7 @@ static void __init sanity_check_meminfo(void)
 static inline void prepare_page_table(void)
 {
         unsigned long addr;
+        phys_addr_t end;
 
         /*
          * Clear out all the mappings below the kernel image.
@@ -867,10 +868,17 @@ static inline void prepare_page_table(void)
                 pmd_clear(pmd_off_k(addr));
 
         /*
+         * Find the end of the first block of lowmem.
+         */
+        end = memblock.memory.regions[0].base + memblock.memory.regions[0].size;
+        if (end >= lowmem_limit)
+                end = lowmem_limit;
+
+        /*
          * Clear out all the kernel space mappings, except for the first
          * memory bank, up to the end of the vmalloc region.
          */
-        for (addr = __phys_to_virt(bank_phys_end(&meminfo.bank[0]));
+        for (addr = __phys_to_virt(end);
              addr < VMALLOC_END; addr += PGDIR_SIZE)
                 pmd_clear(pmd_off_k(addr));
 }
@@ -987,37 +995,28 @@ 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;
+        struct memblock_region *reg;
 
         /* Map all the lowmem memory banks. */
-        for (i = 0; i < mi->nr_banks; i++) {
-                struct membank *bank = &mi->bank[i];
+        for_each_memblock(memory, reg) {
+                phys_addr_t start = reg->base;
+                phys_addr_t end = start + reg->size;
+                struct map_desc map;
+
+                if (end > lowmem_limit)
+                        end = lowmem_limit;
+                if (start >= end)
+                        break;
 
-                if (!bank->highmem)
-                        map_memory_bank(bank);
-        }
-}
+                map.pfn = __phys_to_pfn(start);
+                map.virtual = __phys_to_virt(start);
+                map.length = end - start;
+                map.type = MT_MEMORY;
 
-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;
+                create_mapping(&map);
+        }
 }
 
 /*
@@ -1028,8 +1027,6 @@ 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();