[PATCH 04/18] mm, hugetlb: region manipulation functions take resv_map rather list_head

[Joonsoo Kim]

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....@lge.com>

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 35f6b12..24c0111 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);
 }
 
@@ -1083,7 +1087,7 @@ static long vma_needs_reservation(struct hstate *h,
                pgoff_t idx = vma_hugecache_offset(h, vma, addr);
                struct resv_map *resv = inode->i_mapping->private_data;
 
-               return region_chg(&resv->regions, idx, idx + 1);
+               return region_chg(resv, idx, idx + 1);
 
        } else if (!is_vma_resv_set(vma, HPAGE_RESV_OWNER)) {
                return 1;
@@ -1093,7 +1097,7 @@ 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;
@@ -1109,14 +1113,14 @@ static void vma_commit_reservation(struct hstate *h,
                pgoff_t idx = vma_hugecache_offset(h, vma, addr);
                struct resv_map *resv = inode->i_mapping->private_data;
 
-               region_add(&resv->regions, idx, idx + 1);
+               region_add(resv, idx, idx + 1);
 
        } else if (is_vma_resv_set(vma, HPAGE_RESV_OWNER)) {
                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);
+               region_add(resv, idx, idx + 1);
        }
 }
 
@@ -2203,7 +2207,7 @@ 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);
 
@@ -3078,7 +3082,7 @@ 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();
@@ -3124,7 +3128,7 @@ 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)
@@ -3140,7 +3144,7 @@ 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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