[ARM] mm: move vmalloc= parsing to arch/arm/mm/mmu.c

[linux-2.6-omap-h63xx.git] / arch / arm / mm / mmu.c

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index d41a75ed3dce27431fd11c78f7cf27553bbbe61c..e7af83e569d7a85c9e3afa30c76a5c7ee2aaa100 100644 (file)
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -15,6 +15,7 @@
 #include <linux/mman.h>
 #include <linux/nodemask.h>
 
+#include <asm/cputype.h>
 #include <asm/mach-types.h>
 #include <asm/setup.h>
 #include <asm/sizes.h>
@@ -27,14 +28,12 @@
 
 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 
-extern void _stext, _etext, __data_start, _end;
-extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
-
 /*
  * empty_zero_page is a special page that is used for
  * zero-initialized data and COW.
  */
 struct page *empty_zero_page;
+EXPORT_SYMBOL(empty_zero_page);
 
 /*
  * The pmd table for the upper-most set of pages.
@@ -567,6 +566,77 @@ void __init iotable_init(struct map_desc *io_desc, int nr)
                create_mapping(io_desc + i);
 }
 
+static unsigned long __initdata vmalloc_reserve = SZ_128M;
+
+/*
+ * vmalloc=size forces the vmalloc area to be exactly 'size'
+ * bytes. This can be used to increase (or decrease) the vmalloc
+ * area - the default is 128m.
+ */
+static void __init early_vmalloc(char **arg)
+{
+       vmalloc_reserve = memparse(*arg, arg);
+
+       if (vmalloc_reserve < SZ_16M) {
+               vmalloc_reserve = SZ_16M;
+               printk(KERN_WARNING
+                       "vmalloc area too small, limiting to %luMB\n",
+                       vmalloc_reserve >> 20);
+       }
+}
+__early_param("vmalloc=", early_vmalloc);
+
+#define VMALLOC_MIN    (void *)(VMALLOC_END - vmalloc_reserve)
+
+static int __init check_membank_valid(struct membank *mb)
+{
+       /*
+        * Check whether this memory region has non-zero size or
+        * invalid node number.
+        */
+       if (mb->size == 0 || mb->node >= MAX_NUMNODES)
+               return 0;
+
+       /*
+        * Check whether this memory region would entirely overlap
+        * the vmalloc area.
+        */
+       if (phys_to_virt(mb->start) >= VMALLOC_MIN) {
+               printk(KERN_NOTICE "Ignoring RAM at %.8lx-%.8lx "
+                       "(vmalloc region overlap).\n",
+                       mb->start, mb->start + mb->size - 1);
+               return 0;
+       }
+
+       /*
+        * Check whether this memory region would partially overlap
+        * the vmalloc area.
+        */
+       if (phys_to_virt(mb->start + mb->size) < phys_to_virt(mb->start) ||
+           phys_to_virt(mb->start + mb->size) > VMALLOC_MIN) {
+               unsigned long newsize = VMALLOC_MIN - phys_to_virt(mb->start);
+
+               printk(KERN_NOTICE "Truncating RAM at %.8lx-%.8lx "
+                       "to -%.8lx (vmalloc region overlap).\n",
+                       mb->start, mb->start + mb->size - 1,
+                       mb->start + newsize - 1);
+               mb->size = newsize;
+       }
+
+       return 1;
+}
+
+static void __init sanity_check_meminfo(struct meminfo *mi)
+{
+       int i, j;
+
+       for (i = 0, j = 0; i < mi->nr_banks; i++) {
+               if (check_membank_valid(&mi->bank[i]))
+                       mi->bank[j++] = mi->bank[i];
+       }
+       mi->nr_banks = j;
+}
+
 static inline void prepare_page_table(struct meminfo *mi)
 {
        unsigned long addr;
@@ -752,6 +822,7 @@ void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc)
        void *zero_page;
 
        build_mem_type_table();
+       sanity_check_meminfo(mi);
        prepare_page_table(mi);
        bootmem_init(mi);
        devicemaps_init(mdesc);