[PATCH] MIPS: Use common way to parse elfcorehdr

[Jinyang He]

"elfcorehdr" can be parsed at kernel/crash_dump.c

Signed-off-by: Jinyang He <hejiny...@loongson.cn>
---
 arch/mips/kernel/setup.c | 49 +++++++++++++++++++++---------------------------
 1 file changed, 21 insertions(+), 28 deletions(-)

diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 7e1f8e2..4d2f915 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -29,6 +29,7 @@
 #include <linux/of_fdt.h>
 #include <linux/of_reserved_mem.h>
 #include <linux/dmi.h>
+#include <linux/crash_dump.h>
 
 #include <asm/addrspace.h>
 #include <asm/bootinfo.h>
@@ -404,34 +405,32 @@ static int __init early_parse_memmap(char *p)
 }
 early_param("memmap", early_parse_memmap);
 
-#ifdef CONFIG_PROC_VMCORE
-static unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
-static int __init early_parse_elfcorehdr(char *p)
+static void __init mips_reserve_vmcore(void)
 {
+#ifdef CONFIG_PROC_VMCORE
        phys_addr_t start, end;
        u64 i;
 
-       setup_elfcorehdr = memparse(p, &p);
-
-       for_each_mem_range(i, &start, &end) {
-               if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
-                       /*
-                        * Reserve from the elf core header to the end of
-                        * the memory segment, that should all be kdump
-                        * reserved memory.
-                        */
-                       setup_elfcorehdr_size = end - setup_elfcorehdr;
-                       break;
+       if (!elfcorehdr_size) {
+               for_each_mem_range(i, &start, &end) {
+                       if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
+                               /*
+                                * Reserve from the elf core header to the end 
of
+                                * the memory segment, that should all be kdump
+                                * reserved memory.
+                                */
+                               elfcorehdr_size = end - elfcorehdr_addr;
+                               break;
+                       }
                }
        }
-       /*
-        * If we don't find it in the memory map, then we shouldn't
-        * have to worry about it, as the new kernel won't use it.
-        */
-       return 0;
-}
-early_param("elfcorehdr", early_parse_elfcorehdr);
+
+       pr_info("Reserving %ldKB of memory at %ldKB for kdump\n",
+               (unsigned long)elfcorehdr_size >> 10, (unsigned 
long)elfcorehdr_addr >> 10);
+
+       memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
 #endif
+}
 
 #ifdef CONFIG_KEXEC
 
@@ -653,13 +652,7 @@ static void __init arch_mem_init(char **cmdline_p)
         */
        memblock_set_current_limit(PFN_PHYS(max_low_pfn));
 
-#ifdef CONFIG_PROC_VMCORE
-       if (setup_elfcorehdr && setup_elfcorehdr_size) {
-               printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
-                      setup_elfcorehdr, setup_elfcorehdr_size);
-               memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size);
-       }
-#endif
+       mips_reserve_vmcore();
 
        mips_parse_crashkernel();
 #ifdef CONFIG_KEXEC
-- 
2.1.0