m32r: Fix set_memory() for DISCONTIGMEM

In case CONFIG_DISCONTIGMEM is set, the memory size of system was
always determined by CONFIG_MEMORY_SIZE and was not changeable.

This patch fixes set_memory() of arch/m32r/mm/discontig.c so that
we can specify memory size by the "mem=<size>" kernel parameter.

Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/arch/m32r/mm/discontig.c b/arch/m32r/mm/discontig.c
index b7a78ad429b7..5d2858f6eede 100644
--- a/arch/m32r/mm/discontig.c
+++ b/arch/m32r/mm/discontig.c
@@ -32,6 +32,9 @@ typedef struct {
 } mem_prof_t;
 static mem_prof_t mem_prof[MAX_NUMNODES];
 
+extern unsigned long memory_start;
+extern unsigned long memory_end;
+
 static void __init mem_prof_init(void)
 {
         unsigned long start_pfn, holes, free_pfn;
@@ -42,7 +45,7 @@ static void __init mem_prof_init(void)
         /* Node#0 SDRAM */
         mp = &mem_prof[0];
         mp->start_pfn = PFN_UP(CONFIG_MEMORY_START);
-        mp->pages = PFN_DOWN(CONFIG_MEMORY_SIZE);
+        mp->pages = PFN_DOWN(memory_end - memory_start);
         mp->holes = 0;
         mp->free_pfn = PFN_UP(__pa(_end));