[PATCH v2 08/20] mm, hugetlb: region manipulation functions take resv_map rather list_head

[Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>]

To change a protection method for region tracking to find grained one,
we pass the resv_map, instead of list_head, to region manipulation
functions. This doesn't introduce any functional change, and it is just
for preparing a next step.

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

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 8751e2c..d9cabf6 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -150,8 +150,9 @@ struct file_region {
 	long to;
 };
 
-static long region_add(struct list_head *head, long f, long t)
+static long region_add(struct resv_map *resv, long f, long t)
 {
+	struct list_head *head = &resv->regions;
 	struct file_region *rg, *nrg, *trg;
 
 	/* Locate the region we are either in or before. */
@@ -186,8 +187,9 @@ static long region_add(struct list_head *head, long f, long t)
 	return 0;
 }
 
-static long region_chg(struct list_head *head, long f, long t)
+static long region_chg(struct resv_map *resv, long f, long t)
 {
+	struct list_head *head = &resv->regions;
 	struct file_region *rg, *nrg;
 	long chg = 0;
 
@@ -235,8 +237,9 @@ static long region_chg(struct list_head *head, long f, long t)
 	return chg;
 }
 
-static long region_truncate(struct list_head *head, long end)
+static long region_truncate(struct resv_map *resv, long end)
 {
+	struct list_head *head = &resv->regions;
 	struct file_region *rg, *trg;
 	long chg = 0;
 
@@ -265,8 +268,9 @@ static long region_truncate(struct list_head *head, long end)
 	return chg;
 }
 
-static long region_count(struct list_head *head, long f, long t)
+static long region_count(struct resv_map *resv, long f, long t)
 {
+	struct list_head *head = &resv->regions;
 	struct file_region *rg;
 	long chg = 0;
 
@@ -392,7 +396,7 @@ void resv_map_release(struct kref *ref)
 	struct resv_map *resv_map = container_of(ref, struct resv_map, refs);
 
 	/* Clear out any active regions before we release the map. */
-	region_truncate(&resv_map->regions, 0);
+	region_truncate(resv_map, 0);
 	kfree(resv_map);
 }
 
@@ -1099,7 +1103,7 @@ static long vma_needs_reservation(struct hstate *h,
 		pgoff_t idx = vma_hugecache_offset(h, vma, addr);
 		struct resv_map *resv = vma_resv_map(vma);
 
-		err = region_chg(&resv->regions, idx, idx + 1);
+		err = region_chg(resv, idx, idx + 1);
 		if (err < 0)
 			return err;
 		return 0;
@@ -1121,9 +1125,8 @@ static void vma_commit_reservation(struct hstate *h,
 		pgoff_t idx = vma_hugecache_offset(h, vma, addr);
 		struct resv_map *resv = vma_resv_map(vma);
 
-		/* Mark this page used in the map. */
-		region_add(&resv->regions, idx, idx + 1);
-	}
+	idx = vma_hugecache_offset(h, vma, addr);
+	region_add(resv, idx, idx + 1);
 }
 
 static struct page *alloc_huge_page(struct vm_area_struct *vma,
@@ -2211,7 +2214,7 @@ static void hugetlb_vm_op_close(struct vm_area_struct *vma)
 		end = vma_hugecache_offset(h, vma, vma->vm_end);
 
 		reserve = (end - start) -
-			region_count(&resv->regions, start, end);
+			region_count(resv, start, end);
 
 		resv_map_put(vma);
 
@@ -3091,7 +3094,7 @@ int hugetlb_reserve_pages(struct inode *inode,
 	if (!vma || vma->vm_flags & VM_MAYSHARE) {
 		resv_map = inode->i_mapping->private_data;
 
-		chg = region_chg(&resv_map->regions, from, to);
+		chg = region_chg(resv_map, from, to);
 
 	} else {
 		resv_map = resv_map_alloc();
@@ -3137,7 +3140,7 @@ int hugetlb_reserve_pages(struct inode *inode,
 	 * else has to be done for private mappings here
 	 */
 	if (!vma || vma->vm_flags & VM_MAYSHARE)
-		region_add(&resv_map->regions, from, to);
+		region_add(resv_map, from, to);
 	return 0;
 out_err:
 	if (vma)
@@ -3153,7 +3156,7 @@ void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed)
 	struct hugepage_subpool *spool = subpool_inode(inode);
 
 	if (resv_map)
-		chg = region_truncate(&resv_map->regions, offset);
+		chg = region_truncate(resv_map, offset);
 	spin_lock(&inode->i_lock);
 	inode->i_blocks -= (blocks_per_huge_page(h) * freed);
 	spin_unlock(&inode->i_lock);
-- 
1.7.9.5

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