[PATCH 1/9] mm, hugetlb: move up the code which check availability of free huge page

[Joonsoo Kim]

We don't need to proceede the processing if we don't have any usable
free huge page. So move this code up.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index e2bfbf7..d87f70b 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -539,10 +539,6 @@ static struct page *dequeue_huge_page_vma(struct hstate *h,
 	struct zoneref *z;
 	unsigned int cpuset_mems_cookie;
 
-retry_cpuset:
-	cpuset_mems_cookie = get_mems_allowed();
-	zonelist = huge_zonelist(vma, address,
-					htlb_alloc_mask, &mpol, &nodemask);
 	/*
 	 * A child process with MAP_PRIVATE mappings created by their parent
 	 * have no page reserves. This check ensures that reservations are
@@ -550,11 +546,16 @@ retry_cpuset:
 	 */
 	if (!vma_has_reserves(vma) &&
 			h->free_huge_pages - h->resv_huge_pages == 0)
-		goto err;
+		return NULL;
 
 	/* If reserves cannot be used, ensure enough pages are in the pool */
 	if (avoid_reserve && h->free_huge_pages - h->resv_huge_pages == 0)
-		goto err;
+		return NULL;
+
+retry_cpuset:
+	cpuset_mems_cookie = get_mems_allowed();
+	zonelist = huge_zonelist(vma, address,
+					htlb_alloc_mask, &mpol, &nodemask);
 
 	for_each_zone_zonelist_nodemask(zone, z, zonelist,
 						MAX_NR_ZONES - 1, nodemask) {
@@ -572,10 +573,6 @@ retry_cpuset:
 	if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !page))
 		goto retry_cpuset;
 	return page;
-
-err:
-	mpol_cond_put(mpol);
-	return NULL;
 }
 
 static void update_and_free_page(struct hstate *h, struct page *page)
-- 
1.7.9.5

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