ksm: unstable_tree_search_insert error checking cleanup

get_mergeable_page() can only return NULL (also in case of errors) or the
pinned mergeable page.  It can't return an error different than NULL.
This optimizes away the unnecessary error check.

Add a return after the "out:" label in the callee to make it more
readable.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Petr Holasek <pholasek@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/ksm.c b/mm/ksm.c
index 0183083..b5cd647 100644 (file)
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -475,7 +475,8 @@ static struct page *get_mergeable_page(struct rmap_item *rmap_item)
                flush_dcache_page(page);
        } else {
                put_page(page);
-out:           page = NULL;
+out:
+               page = NULL;
        }
        up_read(&mm->mmap_sem);
        return page;
@@ -1358,7 +1359,7 @@ struct rmap_item *unstable_tree_search_insert(struct rmap_item *rmap_item,
                cond_resched();
                tree_rmap_item = rb_entry(*new, struct rmap_item, node);
                tree_page = get_mergeable_page(tree_rmap_item);
-               if (IS_ERR_OR_NULL(tree_page))
+               if (!tree_page)
                        return NULL;
 
                /*