[PATCH 1/3] mm/migrate: clean up useless code in migrate_vma_collect_pmd()

[Pingfan Liu]

Signed-off-by: Pingfan Liu <kernelf...@gmail.com>
Cc: "Jérôme Glisse" <jgli...@redhat.com>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Mel Gorman <mgor...@techsingularity.net>
Cc: Jan Kara <j...@suse.cz>
Cc: "Kirill A. Shutemov" <kirill.shute...@linux.intel.com>
Cc: Michal Hocko <mho...@suse.com>
Cc: Mike Kravetz <mike.krav...@oracle.com>
Cc: Andrea Arcangeli <aarca...@redhat.com>
Cc: Matthew Wilcox <wi...@infradead.org>
To: linux...@kvack.org
Cc: linux-kernel@vger.kernel.org
---
 mm/migrate.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 8992741..c2ec614 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2230,7 +2230,6 @@ static int migrate_vma_collect_pmd(pmd_t *pmdp,
                if (pte_none(pte)) {
                        mpfn = MIGRATE_PFN_MIGRATE;
                        migrate->cpages++;
-                       pfn = 0;
                        goto next;
                }
 
@@ -2255,7 +2254,6 @@ static int migrate_vma_collect_pmd(pmd_t *pmdp,
                        if (is_zero_pfn(pfn)) {
                                mpfn = MIGRATE_PFN_MIGRATE;
                                migrate->cpages++;
-                               pfn = 0;
                                goto next;
                        }
                        page = vm_normal_page(migrate->vma, addr, pte);
@@ -2265,10 +2263,9 @@ static int migrate_vma_collect_pmd(pmd_t *pmdp,
 
                /* FIXME support THP */
                if (!page || !page->mapping || PageTransCompound(page)) {
-                       mpfn = pfn = 0;
+                       mpfn = 0;
                        goto next;
                }
-               pfn = page_to_pfn(page);
 
                /*
                 * By getting a reference on the page we pin it and that blocks
-- 
2.7.5