mips: Make sure kernel memory is in iomem

Kernel memory isn't necessarily added to the memory tables, so it
wouldn't show up in /proc/iomem.  This was breaking kdump, which
requires these memory addresses to work correctly.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Acked-by: David Daney <ddaney@caviumnetworks.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Patchwork: http://patchwork.linux-mips.org/patch/4937/

1 files changed, 31 insertions, 21 deletions

diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 8c41187801ce..53462500c3cd 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -480,34 +480,44 @@ static int __init early_parse_mem(char *p)
 }
 early_param("mem", early_parse_mem);
 
-static void __init arch_mem_init(char **cmdline_p)
+static void __init arch_mem_addpart(phys_t mem, phys_t end, int type)
 {
-        phys_t init_mem, init_end, init_size;
+        phys_t size;
+        int i;
+
+        size = end - mem;
+        if (!size)
+                return;
+
+        /* Make sure it is in the boot_mem_map */
+        for (i = 0; i < boot_mem_map.nr_map; i++) {
+                if (mem >= boot_mem_map.map[i].addr &&
+                    mem < (boot_mem_map.map[i].addr +
+                           boot_mem_map.map[i].size))
+                        return;
+        }
+        add_memory_region(mem, size, type);
+}
 
+static void __init arch_mem_init(char **cmdline_p)
+{
         extern void plat_mem_setup(void);
 
         /* call board setup routine */
         plat_mem_setup();
 
-        init_mem = PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT;
-        init_end = PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT;
-        init_size = init_end - init_mem;
-        if (init_size) {
-                /* Make sure it is in the boot_mem_map */
-                int i, found;
-                found = 0;
-                for (i = 0; i < boot_mem_map.nr_map; i++) {
-                        if (init_mem >= boot_mem_map.map[i].addr &&
-                            init_mem < (boot_mem_map.map[i].addr +
-                                        boot_mem_map.map[i].size)) {
-                                found = 1;
-                                break;
-                        }
-                }
-                if (!found)
-                        add_memory_region(init_mem, init_size,
-                                          BOOT_MEM_INIT_RAM);
-        }
+        /*
+         * Make sure all kernel memory is in the maps.  The "UP" and
+         * "DOWN" are opposite for initdata since if it crosses over
+         * into another memory section you don't want that to be
+         * freed when the initdata is freed.
+         */
+        arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
+                         PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
+                         BOOT_MEM_RAM);
+        arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
+                         PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
+                         BOOT_MEM_INIT_RAM);
 
         pr_info("Determined physical RAM map:\n");
         print_memory_map();