[PATCH 3/3] mm/migrate: remove the duplicated code migrate_vma_collect_hole()

[Pingfan Liu]

After the previous patch which sees hole as invalid source,
migrate_vma_collect_hole() has the same code as migrate_vma_collect_skip().
Removing the duplicated code.

Signed-off-by: Pingfan Liu <kernelfans@xxxxxxxxx>
Cc: "JÃrÃme Glisse" <jglisse@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
To: linux-mm@xxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
 mm/migrate.c | 22 +++-------------------
 1 file changed, 3 insertions(+), 19 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 832483f..95e038d 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2128,22 +2128,6 @@ struct migrate_vma {
 	unsigned long		end;
 };
 
-static int migrate_vma_collect_hole(unsigned long start,
-				    unsigned long end,
-				    struct mm_walk *walk)
-{
-	struct migrate_vma *migrate = walk->private;
-	unsigned long addr;
-
-	for (addr = start & PAGE_MASK; addr < end; addr += PAGE_SIZE) {
-		migrate->src[migrate->npages] = 0;
-		migrate->dst[migrate->npages] = 0;
-		migrate->npages++;
-	}
-
-	return 0;
-}
-
 static int migrate_vma_collect_skip(unsigned long start,
 				    unsigned long end,
 				    struct mm_walk *walk)
@@ -2173,7 +2157,7 @@ static int migrate_vma_collect_pmd(pmd_t *pmdp,
 
 again:
 	if (pmd_none(*pmdp))
-		return migrate_vma_collect_hole(start, end, walk);
+		return migrate_vma_collect_skip(start, end, walk);
 
 	if (pmd_trans_huge(*pmdp)) {
 		struct page *page;
@@ -2206,7 +2190,7 @@ static int migrate_vma_collect_pmd(pmd_t *pmdp,
 				return migrate_vma_collect_skip(start, end,
 								walk);
 			if (pmd_none(*pmdp))
-				return migrate_vma_collect_hole(start, end,
+				return migrate_vma_collect_skip(start, end,
 								walk);
 		}
 	}
@@ -2337,7 +2321,7 @@ static void migrate_vma_collect(struct migrate_vma *migrate)
 
 	mm_walk.pmd_entry = migrate_vma_collect_pmd;
 	mm_walk.pte_entry = NULL;
-	mm_walk.pte_hole = migrate_vma_collect_hole;
+	mm_walk.pte_hole = migrate_vma_collect_skip;
 	mm_walk.hugetlb_entry = NULL;
 	mm_walk.test_walk = NULL;
 	mm_walk.vma = migrate->vma;
-- 
2.7.5