[PATCH v2 1/5] mm/hugetlb: add same zone check in pfn_range_valid_gigantic()

js1304
2016-04-01T02:07:10Z

alloc_gigantic_page() uses alloc_contig_range() and this
requires that requested range is in a single zone. To satisfy
that requirement, add this check to pfn_range_valid_gigantic().

Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
---
mm/hugetlb.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 2c7f304..6bc7e9e 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1031,8 +1031,8 @@ static int __alloc_gigantic_page(unsigned long start_pfn,
return alloc_contig_range(start_pfn, end_pfn, MIGRATE_MOVABLE);
}

-static bool pfn_range_valid_gigantic(unsigned long start_pfn,
- unsigned long nr_pages)
+static bool pfn_range_valid_gigantic(struct zone *z,
+ unsigned long start_pfn, unsigned long nr_pages)
{
unsigned long i, end_pfn = start_pfn + nr_pages;
struct page *page;
@@ -1043,6 +1043,9 @@ static bool pfn_range_valid_gigantic(unsigned long start_pfn,

page = pfn_to_page(i);

+ if (page_zone(page) != z)
+ return false;
+
if (PageReserved(page))
return false;

@@ -1075,7 +1078,7 @@ static struct page *alloc_gigantic_page(int nid, unsigned int order)

pfn = ALIGN(z->zone_start_pfn, nr_pages);
while (zone_spans_last_pfn(z, pfn, nr_pages)) {
- if (pfn_range_valid_gigantic(pfn, nr_pages)) {
+ if (pfn_range_valid_gigantic(z, pfn, nr_pages)) {
/*
* We release the zone lock here because
* alloc_contig_range() will also lock the zone
--
1.9.1