[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>

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 64262bd..83145d1 100644 (file)
--- 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.

diff --git a/include/asm-arm/setup.h b/include/asm-arm/setup.h
index ea3ed24..aa4b578 100644 (file)
--- a/include/asm-arm/setup.h
+++ b/include/asm-arm/setup.h
@@ -194,13 +194,15 @@ static struct tagtable __tagtable_##fn __tag = { tag, fn }
 # define NR_BANKS 8
 #endif
 
+struct membank {
+       unsigned long start;
+       unsigned long size;
+       int           node;
+};
+
 struct meminfo {
        int nr_banks;
-       struct {
-               unsigned long start;
-               unsigned long size;
-               int           node;
-       } bank[NR_BANKS];
+       struct membank bank[NR_BANKS];
 };
 
 /*