mm: rename _count, field of the struct page, to _refcount

[mirror_ubuntu-zesty-kernel.git] / include / linux / pagemap.h

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 7e1ab155c67c78dd6e41defebd238bce0d59af7f..fe1513ffb7bf5ca21c004c0eb654f1c23433d955 100644 (file)
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -90,12 +90,12 @@ void release_pages(struct page **pages, int nr, bool cold);
 
 /*
  * speculatively take a reference to a page.
- * If the page is free (_count == 0), then _count is untouched, and 0
- * is returned. Otherwise, _count is incremented by 1 and 1 is returned.
+ * If the page is free (_refcount == 0), then _refcount is untouched, and 0
+ * is returned. Otherwise, _refcount is incremented by 1 and 1 is returned.
  *
  * This function must be called inside the same rcu_read_lock() section as has
  * been used to lookup the page in the pagecache radix-tree (or page table):
- * this allows allocators to use a synchronize_rcu() to stabilize _count.
+ * this allows allocators to use a synchronize_rcu() to stabilize _refcount.
  *
  * Unless an RCU grace period has passed, the count of all pages coming out
  * of the allocator must be considered unstable. page_count may return higher
@@ -111,7 +111,7 @@ void release_pages(struct page **pages, int nr, bool cold);
  * 2. conditionally increment refcount
  * 3. check the page is still in pagecache (if no, goto 1)
  *
- * Remove-side that cares about stability of _count (eg. reclaim) has the
+ * Remove-side that cares about stability of _refcount (eg. reclaim) has the
  * following (with tree_lock held for write):
  * A. atomically check refcount is correct and set it to 0 (atomic_cmpxchg)
  * B. remove page from pagecache