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

[Christoph Lameter]

On Thu, 5 Jun 2008, npiggin@xxxxxxx 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.


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