mm: add_active_or_unevictable into rmap

lru_cache_add_active_or_unevictable() and page_add_new_anon_rmap() always
appear together.  Save some symbol table space and some jumping around by
removing lru_cache_add_active_or_unevictable(), folding its code into
page_add_new_anon_rmap(): like how we add file pages to lru just after
adding them to page cache.

Remove the nearby "TODO: is this safe?" comments (yes, it is safe), and
change page_add_new_anon_rmap()'s address BUG_ON to VM_BUG_ON as
originally intended.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 6 deletions

diff --git a/mm/memory.c b/mm/memory.c
index b5af358b8b22..a138c50dc39a 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1949,10 +1949,7 @@ gotten:
                  */
                 ptep_clear_flush_notify(vma, address, page_table);
                 SetPageSwapBacked(new_page);
-                lru_cache_add_active_or_unevictable(new_page, vma);
                 page_add_new_anon_rmap(new_page, vma, address);
-
-//TODO:  is this safe?  do_anonymous_page() does it this way.
                 set_pte_at(mm, address, page_table, entry);
                 update_mmu_cache(vma, address, entry);
                 if (old_page) {
@@ -2448,7 +2445,6 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
                 goto release;
         inc_mm_counter(mm, anon_rss);
         SetPageSwapBacked(page);
-        lru_cache_add_active_or_unevictable(page, vma);
         page_add_new_anon_rmap(page, vma, address);
         set_pte_at(mm, address, page_table, entry);
 
@@ -2597,7 +2593,6 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
                 if (anon) {
                         inc_mm_counter(mm, anon_rss);
                         SetPageSwapBacked(page);
-                        lru_cache_add_active_or_unevictable(page, vma);
                         page_add_new_anon_rmap(page, vma, address);
                 } else {
                         inc_mm_counter(mm, file_rss);
@@ -2607,7 +2602,6 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
                                 get_page(dirty_page);
                         }
                 }
-//TODO:  is this safe?  do_anonymous_page() does it this way.
                 set_pte_at(mm, address, page_table, entry);
 
                 /* no need to invalidate: a not-present page won't be cached */