microblaze: Fix mapin_ram function

Fix how many pages are allocated in mapin_ram. It is lowmem_size
not setup CONFIG_LOWMEM_SIZE because it is the same for all systems.
Which means that wrong pages are allocated if memory size is smaller
than CONFIG_LOWMEM_SIZE. It has dramatic impact on bootup time.
On sp605 MMU full hw design is 7s.

Signed-off-by: Michal Simek <monstr@monstr.eu>

2 files changed, 2 insertions, 1 deletions

diff --git a/arch/microblaze/include/asm/page.h b/arch/microblaze/include/asm/page.h
index 665f29330ce..352cc2352bd 100644
--- a/arch/microblaze/include/asm/page.h
+++ b/arch/microblaze/include/asm/page.h
@@ -136,6 +136,7 @@ extern unsigned long max_pfn;
 
 extern unsigned long memory_start;
 extern unsigned long memory_size;
+extern unsigned long lowmem_size;
 
 extern int page_is_ram(unsigned long pfn);
 
diff --git a/arch/microblaze/mm/pgtable.c b/arch/microblaze/mm/pgtable.c
index 84905da83cb..d1c06d07fed 100644
--- a/arch/microblaze/mm/pgtable.c
+++ b/arch/microblaze/mm/pgtable.c
@@ -167,7 +167,7 @@ void __init mapin_ram(void)
 
         v = CONFIG_KERNEL_START;
         p = memory_start;
-        for (s = 0; s < CONFIG_LOWMEM_SIZE; s += PAGE_SIZE) {
+        for (s = 0; s < lowmem_size; s += PAGE_SIZE) {
                 f = _PAGE_PRESENT | _PAGE_ACCESSED |
                                 _PAGE_SHARED | _PAGE_HWEXEC;
                 if ((char *) v < _stext || (char *) v >= _etext)