[RFC PATCH 3/6] ARM, crashkernel: correct total_mem size in reserve_crashkernel()

[Joonsoo Kim]

There is some platforms which have highmem, so this equation
doesn't represent total_mem size properly.
In addition, max_low_pfn's meaning is different in other architecture and
it is scheduled to be changed, so remove related code to max_low_pfn.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim at lge.com>

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 99ffe87..1149988 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -655,14 +655,6 @@ static int __init init_machine_late(void)
 late_initcall(init_machine_late);
 
 #ifdef CONFIG_KEXEC
-static inline unsigned long long get_total_mem(void)
-{
-	unsigned long total;
-
-	total = max_low_pfn - min_low_pfn;
-	return total << PAGE_SHIFT;
-}
-
 /**
  * reserve_crashkernel() - reserves memory are for crash kernel
  *
@@ -677,7 +669,7 @@ static void __init reserve_crashkernel(void)
 	unsigned long limit = 0;
 	int ret;
 
-	total_mem = get_total_mem();
+	total_mem = memblock_phys_mem_size();
 	ret = parse_crashkernel(boot_command_line, total_mem,
 				&crash_size, &crash_base);
 	if (ret != 0 || crash_size == 0)
-- 
1.7.9.5