This is needed by slab defragmentation. The refcount of a page head
may be incremented to ensure that a compound page will not go away under us.
It also may be needed for defragmentation of higher order pages. The
moving of compound pages may require the establishment of a reference
before the use of page migration functions.
Signed-off-by: Christoph Lameter <[email protected]>
---
include/linux/mm.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
Index: linux-2.6/include/linux/mm.h
===================================================================
--- linux-2.6.orig/include/linux/mm.h 2007-08-27 20:59:40.000000000 -0700
+++ linux-2.6/include/linux/mm.h 2007-08-27 21:03:20.000000000 -0700
@@ -290,7 +290,7 @@ static inline int put_page_testzero(stru
*/
static inline int get_page_unless_zero(struct page *page)
{
- VM_BUG_ON(PageCompound(page));
+ VM_BUG_ON(PageTail(page));
return atomic_inc_not_zero(&page->_count);
}
--
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
