Re: [PATCH] nommu: fix kobjsize() for SLOB and SLUB

Paul Mundt
2008-05-22T23:52:21Z

On Thu, May 22, 2008 at 04:45:55PM -0700, Christoph Lameter wrote:
> On Fri, 23 May 2008, Paul Mundt wrote:
> > Is ksize() happy with taking the head page instead of virt_to_page(objp)?
>
> ksize() takes a pointer to an object. ksize() cannot take a the pointer to
> a page struct.
>
Ah, so it does. In that case, we still need to kill off the page->index
BUG_ON() bits, while PageCompound() will take care of the compound order
bits that the page->index shifting seems to have been trying to
implement, the BUG_ON() will still trigger for PAGE_SIZE page cache
pages.