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>

diff --git a/arch/m32r/mm/discontig.c b/arch/m32r/mm/discontig.c
index b7a78ad..5d2858f 100644 (file)
--- 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));