openrisc: fix PTRS_PER_PGD define

On OpenRISC, with its 8k pages, PAGE_SHIFT is defined to be 13.
That makes the expression (1UL << (PAGE_SHIFT-2)) evaluate
to 2048.
The correct value for PTRS_PER_PGD should be 256.

Correcting the PTRS_PER_PGD define unveiled a bug in map_ram(),
where PTRS_PER_PGD was used when the intent was to iterate
over a set of page table entries.
This patch corrects that issue as well.

Signed-off-by: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Acked-by: Jonas Bonn <jonas@southpole.se>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Stafford Horne <shorne@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/openrisc/mm/init.c b/arch/openrisc/mm/init.c
index 7f94652311d7..b782ce9ccad9 100644
--- a/arch/openrisc/mm/init.c
+++ b/arch/openrisc/mm/init.c
@@ -110,7 +110,7 @@ static void __init map_ram(void)
                         set_pmd(pme, __pmd(_KERNPG_TABLE + __pa(pte)));
 
                         /* Fill the newly allocated page with PTE'S */
-                        for (j = 0; p < e && j < PTRS_PER_PGD;
+                        for (j = 0; p < e && j < PTRS_PER_PTE;
                              v += PAGE_SIZE, p += PAGE_SIZE, j++, pte++) {
                                 if (v >= (u32) _e_kernel_ro ||
                                     v < (u32) _s_kernel_ro)