From: Joonsoo Kim <iamjoonsoo....@lge.com>
It's not good practice to modify user input. Instead of using it to
build correct gfp_mask for APIs, this patch introduces another gfp_mask
field, __gfp_mask, for internal usage.
Signed-off-by: Joonsoo Kim <iamjoonsoo....@lge.com>
---
mm/hugetlb.c | 19 ++++++++++---------
mm/internal.h | 2 ++
2 files changed, 12 insertions(+), 9 deletions(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index e465582..4757e72 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1068,15 +1068,15 @@ static struct page *dequeue_huge_page_nodemask(struct
hstate *h,
struct zoneref *z;
int node = NUMA_NO_NODE;
- zonelist = node_zonelist(ac->nid, ac->gfp_mask);
+ zonelist = node_zonelist(ac->nid, ac->__gfp_mask);
retry_cpuset:
cpuset_mems_cookie = read_mems_allowed_begin();
for_each_zone_zonelist_nodemask(zone, z, zonelist,
- gfp_zone(ac->gfp_mask), ac->nmask) {
+ gfp_zone(ac->__gfp_mask), ac->nmask) {
struct page *page;
- if (!cpuset_zone_allowed(zone, ac->gfp_mask))
+ if (!cpuset_zone_allowed(zone, ac->__gfp_mask))
continue;
/*
* no need to ask again on the same node. Pool is node rather
than
@@ -1127,8 +1127,8 @@ static struct page *dequeue_huge_page_vma(struct hstate
*h,
if (avoid_reserve && h->free_huge_pages - h->resv_huge_pages == 0)
goto err;
- ac.gfp_mask = htlb_alloc_mask(h);
- ac.nid = huge_node(vma, address, ac.gfp_mask, &mpol, &ac.nmask);
+ ac.__gfp_mask = htlb_alloc_mask(h);
+ ac.nid = huge_node(vma, address, ac.__gfp_mask, &mpol, &ac.nmask);
page = dequeue_huge_page_nodemask(h, &ac);
if (page && !avoid_reserve && vma_has_reserves(vma, chg)) {
@@ -1951,7 +1951,7 @@ static struct page *alloc_migrate_huge_page(struct hstate
*h,
if (hstate_is_gigantic(h))
return NULL;
- page = alloc_fresh_huge_page(h, ac->gfp_mask,
+ page = alloc_fresh_huge_page(h, ac->__gfp_mask,
ac->nid, ac->nmask, NULL);
if (!page)
return NULL;
@@ -1989,9 +1989,10 @@ struct page *alloc_buddy_huge_page_with_mpol(struct
hstate *h,
struct page *alloc_huge_page_nodemask(struct hstate *h,
struct alloc_control *ac)
{
- ac->gfp_mask |= htlb_alloc_mask(h);
+ ac->__gfp_mask = htlb_alloc_mask(h);
+ ac->__gfp_mask |= ac->gfp_mask;
if (ac->nid == NUMA_NO_NODE)
- ac->gfp_mask &= ~__GFP_THISNODE;
+ ac->__gfp_mask &= ~__GFP_THISNODE;
spin_lock(&hugetlb_lock);
if (h->free_huge_pages - h->resv_huge_pages > 0) {
@@ -2010,7 +2011,7 @@ struct page *alloc_huge_page_nodemask(struct hstate *h,
* will not come from CMA area
*/
if (ac->skip_cma)
- ac->gfp_mask &= ~__GFP_MOVABLE;
+ ac->__gfp_mask &= ~__GFP_MOVABLE;
return alloc_migrate_huge_page(h, ac);
}
diff --git a/mm/internal.h b/mm/internal.h
index 159cfd6..2dc0268 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -619,6 +619,8 @@ struct alloc_control {
nodemask_t *nmask;
gfp_t gfp_mask;
bool skip_cma;
+
+ gfp_t __gfp_mask; /* Used internally in API implementation */
};
#endif /* __MM_INTERNAL_H */
--
2.7.4
