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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>
This commit is contained in:
Stefan Kristiansson 2014-01-11 00:17:38 +02:00 committed by Stafford Horne
parent 69973b8308
commit f47706099b
2 changed files with 2 additions and 2 deletions
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2
arch/openrisc/include/asm/pgtable.h
View File

@ -69,7 +69,7 @@ extern void paging_init(void);
*/
#define PTRS_PER_PTE (1UL << (PAGE_SHIFT-2))
#define PTRS_PER_PGD (1UL << (PAGE_SHIFT-2))
#define PTRS_PER_PGD (1UL << (32-PGDIR_SHIFT))
/* calculate how many PGD entries a user-level program can use
* the first mappable virtual address is 0

2
arch/openrisc/mm/init.c
View File

@ -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)