[PATCH] mm: zap_pte_range dec rss

Small adjustment: zap_pte_range decrement its rss counts from 0 then finally
add, avoiding negations - we don't have or need a sub_mm_rss.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/mm/memory.c b/mm/memory.c
index 7893eb4..bc62963 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -609,13 +609,13 @@ static void zap_pte_range(struct mmu_gather *tlb,
                                set_pte_at(mm, addr, pte,
                                           pgoff_to_pte(page->index));
                        if (PageAnon(page))
-                               anon_rss++;
+                               anon_rss--;
                        else {
                                if (pte_dirty(ptent))
                                        set_page_dirty(page);
                                if (pte_young(ptent))
                                        mark_page_accessed(page);
-                               file_rss++;
+                               file_rss--;
                        }
                        page_remove_rmap(page);
                        tlb_remove_page(tlb, page);
@@ -632,7 +632,7 @@ static void zap_pte_range(struct mmu_gather *tlb,
                pte_clear_full(mm, addr, pte, tlb->fullmm);
        } while (pte++, addr += PAGE_SIZE, addr != end);
 
-       add_mm_rss(mm, -file_rss, -anon_rss);
+       add_mm_rss(mm, file_rss, anon_rss);
        pte_unmap(pte - 1);
 }