linux-kernel - [PATCH 4/8] mm, hugetlb: remove resv_map

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Date:	Sun, 26 Jan 2014 19:52:22 -0800
From:	Davidlohr Bueso <davidlohr@...com>
To:	akpm@...ux-foundation.org, iamjoonsoo.kim@....com
Cc:	riel@...hat.com, mgorman@...e.de, mhocko@...e.cz,
	aneesh.kumar@...ux.vnet.ibm.com, kamezawa.hiroyu@...fujitsu.com,
	hughd@...gle.com, david@...son.dropbear.id.au, js1304@...il.com,
	liwanp@...ux.vnet.ibm.com, n-horiguchi@...jp.nec.com,
	dhillf@...il.com, rientjes@...gle.com, davidlohr@...com,
	aswin@...com, scott.norton@...com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/8] mm, hugetlb: remove resv_map_put

From: Joonsoo Kim <iamjoonsoo.kim@....com>

This is a preparation patch to unify the use of vma_resv_map() regardless
of the map type. This patch prepares it by removing resv_map_put(), which
only works for HPAGE_RESV_OWNER's resv_map, not for all resv_maps.

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
[Updated changelog]
Signed-off-by: Davidlohr Bueso <davidlohr@...com>
---
 mm/hugetlb.c | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 6b40d7e..13edf17 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2273,15 +2273,6 @@ static void hugetlb_vm_op_open(struct vm_area_struct *vma)
 		kref_get(&resv->refs);
 }
 
-static void resv_map_put(struct vm_area_struct *vma)
-{
-	struct resv_map *resv = vma_resv_map(vma);
-
-	if (!resv)
-		return;
-	kref_put(&resv->refs, resv_map_release);
-}
-
 static void hugetlb_vm_op_close(struct vm_area_struct *vma)
 {
 	struct hstate *h = hstate_vma(vma);
@@ -2298,7 +2289,7 @@ static void hugetlb_vm_op_close(struct vm_area_struct *vma)
 		reserve = (end - start) -
 			region_count(resv, start, end);
 
-		resv_map_put(vma);
+		kref_put(&resv->refs, resv_map_release);
 
 		if (reserve) {
 			hugetlb_acct_memory(h, -reserve);
@@ -3247,8 +3238,8 @@ int hugetlb_reserve_pages(struct inode *inode,
 		region_add(resv_map, from, to);
 	return 0;
 out_err:
-	if (vma)
-		resv_map_put(vma);
+	if (vma && is_vma_resv_set(vma, HPAGE_RESV_OWNER))
+		kref_put(&resv_map->refs, resv_map_release);
 	return ret;
 }
 
-- 
1.8.1.4

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