Re: [patch 7/7] powerpc: lockless get_user_pages_fast

Christoph Lameter
2008-06-10T19:00:48Z

On Thu, 5 Jun 2008, npiggin@suse.de wrote:

> Index: linux-2.6/include/linux/mm.h
> ===================================================================
> --- linux-2.6.orig/include/linux/mm.h
> +++ linux-2.6/include/linux/mm.h
> @@ -244,7 +244,7 @@ static inline int put_page_testzero(stru
> */
> static inline int get_page_unless_zero(struct page *page)
> {
> - VM_BUG_ON(PageTail(page));
> + VM_BUG_ON(PageCompound(page));
> return atomic_inc_not_zero(&page->_count);
> }

This is reversing the modification to make get_page_unless_zero() usable
with compound page heads. Will break the slab defrag patchset.