[ARM] Separate page table manipulation code from bootmem initialisation

nommu does not require the page table manipulation code in the
bootmem initialisation paths.  Move this into separate inline
functions.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 44 insertions, 29 deletions

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 64262bda8e54..83145d1d3389 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -226,6 +226,44 @@ static __init void reserve_node_zero(pg_data_t *pgdat)
                 reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size);
 }
 
+static inline void prepare_page_table(struct meminfo *mi)
+{
+        unsigned long addr;
+
+        /*
+         * Clear out all the mappings below the kernel image.
+         */
+        for (addr = 0; addr < MODULE_START; addr += PGDIR_SIZE)
+                pmd_clear(pmd_off_k(addr));
+
+#ifdef CONFIG_XIP_KERNEL
+        /* The XIP kernel is mapped in the module area -- skip over it */
+        addr = ((unsigned long)&_etext + PGDIR_SIZE - 1) & PGDIR_MASK;
+#endif
+        for ( ; addr < PAGE_OFFSET; addr += PGDIR_SIZE)
+                pmd_clear(pmd_off_k(addr));
+
+        /*
+         * 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(mi->bank[0].start + mi->bank[0].size);
+             addr < VMALLOC_END; addr += PGDIR_SIZE)
+                pmd_clear(pmd_off_k(addr));
+}
+
+static inline void map_memory_bank(struct membank *bank)
+{
+        struct map_desc map;
+
+        map.pfn = __phys_to_pfn(bank->start);
+        map.virtual = __phys_to_virt(bank->start);
+        map.length = bank->size;
+        map.type = MT_MEMORY;
+
+        create_mapping(&map);
+}
+
 static unsigned long __init
 bootmem_init_node(int node, int initrd_node, struct meminfo *mi)
 {
@@ -242,23 +280,18 @@ bootmem_init_node(int node, int initrd_node, struct meminfo *mi)
          * Calculate the pfn range, and map the memory banks for this node.
          */
         for_each_nodebank(i, mi, node) {
+                struct membank *bank = &mi->bank[i];
                 unsigned long start, end;
-                struct map_desc map;
 
-                start = mi->bank[i].start >> PAGE_SHIFT;
-                end = (mi->bank[i].start + mi->bank[i].size) >> PAGE_SHIFT;
+                start = bank->start >> PAGE_SHIFT;
+                end = (bank->start + bank->size) >> PAGE_SHIFT;
 
                 if (start_pfn > start)
                         start_pfn = start;
                 if (end_pfn < end)
                         end_pfn = end;
 
-                map.pfn = __phys_to_pfn(mi->bank[i].start);
-                map.virtual = __phys_to_virt(mi->bank[i].start);
-                map.length = mi->bank[i].size;
-                map.type = MT_MEMORY;
-
-                create_mapping(&map);
+                map_memory_bank(bank);
         }
 
         /*
@@ -342,7 +375,7 @@ bootmem_init_node(int node, int initrd_node, struct meminfo *mi)
 
 static void __init bootmem_init(struct meminfo *mi)
 {
-        unsigned long addr, memend_pfn = 0;
+        unsigned long memend_pfn = 0;
         int node, initrd_node, i;
 
         /*
@@ -354,25 +387,7 @@ static void __init bootmem_init(struct meminfo *mi)
 
         memcpy(&meminfo, mi, sizeof(meminfo));
 
-        /*
-         * Clear out all the mappings below the kernel image.
-         */
-        for (addr = 0; addr < MODULE_START; addr += PGDIR_SIZE)
-                pmd_clear(pmd_off_k(addr));
-#ifdef CONFIG_XIP_KERNEL
-        /* The XIP kernel is mapped in the module area -- skip over it */
-        addr = ((unsigned long)&_etext + PGDIR_SIZE - 1) & PGDIR_MASK;
-#endif
-        for ( ; addr < PAGE_OFFSET; addr += PGDIR_SIZE)
-                pmd_clear(pmd_off_k(addr));
-
-        /*
-         * 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(mi->bank[0].start + mi->bank[0].size);
-             addr < VMALLOC_END; addr += PGDIR_SIZE)
-                pmd_clear(pmd_off_k(addr));
+        prepare_page_table(mi);
 
         /*
          * Locate which node contains the ramdisk image, if any.