x86, mm: use limit_pfn for end pfn
instead of shifting end to get that.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1353123563-3103-39-git-send-email-yinghai@kernel.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 4bf1c53..f410dc6 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -203,10 +203,12 @@
unsigned long start,
unsigned long end)
{
- unsigned long start_pfn, end_pfn;
+ unsigned long start_pfn, end_pfn, limit_pfn;
unsigned long pfn;
int i;
+ limit_pfn = PFN_DOWN(end);
+
/* head if not big page alignment ? */
pfn = start_pfn = PFN_DOWN(start);
#ifdef CONFIG_X86_32
@@ -223,8 +225,8 @@
#else /* CONFIG_X86_64 */
end_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE));
#endif
- if (end_pfn > PFN_DOWN(end))
- end_pfn = PFN_DOWN(end);
+ if (end_pfn > limit_pfn)
+ end_pfn = limit_pfn;
if (start_pfn < end_pfn) {
nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
pfn = end_pfn;
@@ -233,11 +235,11 @@
/* big page (2M) range */
start_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE));
#ifdef CONFIG_X86_32
- end_pfn = PFN_DOWN(round_down(end, PMD_SIZE));
+ end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE));
#else /* CONFIG_X86_64 */
end_pfn = round_up(pfn, PFN_DOWN(PUD_SIZE));
- if (end_pfn > PFN_DOWN(round_down(end, PMD_SIZE)))
- end_pfn = PFN_DOWN(round_down(end, PMD_SIZE));
+ if (end_pfn > round_down(limit_pfn, PFN_DOWN(PMD_SIZE)))
+ end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE));
#endif
if (start_pfn < end_pfn) {
@@ -249,7 +251,7 @@
#ifdef CONFIG_X86_64
/* big page (1G) range */
start_pfn = round_up(pfn, PFN_DOWN(PUD_SIZE));
- end_pfn = PFN_DOWN(round_down(end, PUD_SIZE));
+ end_pfn = round_down(limit_pfn, PFN_DOWN(PUD_SIZE));
if (start_pfn < end_pfn) {
nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
page_size_mask &
@@ -259,7 +261,7 @@
/* tail is not big page (1G) alignment */
start_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE));
- end_pfn = PFN_DOWN(round_down(end, PMD_SIZE));
+ end_pfn = round_down(limit_pfn, PFN_DOWN(PMD_SIZE));
if (start_pfn < end_pfn) {
nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
page_size_mask & (1<<PG_LEVEL_2M));
@@ -269,7 +271,7 @@
/* tail is not big page (2M) alignment */
start_pfn = pfn;
- end_pfn = PFN_DOWN(end);
+ end_pfn = limit_pfn;
nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
/* try to merge same page size and continuous */