On Wed, 19 Dec 2007, Dave Hansen wrote:
> > --- linux-2.6.24-rc5/mm/page_alloc.c~memory-controller-move-to-bug-on-in-free_hot_cold_page 2007-12-19 11:31:46.000000000 +0530
> > +++ linux-2.6.24-rc5-balbir/mm/page_alloc.c 2007-12-19 11:33:45.000000000 +0530
> > @@ -995,7 +995,7 @@ static void fastcall free_hot_cold_page(
> >
> > if (!PageHighMem(page))
> > debug_check_no_locks_freed(page_address(page), PAGE_SIZE);
> > - page_assign_page_cgroup(page, NULL);
> > + VM_BUG_ON(page_get_page_cgroup(page));
> > arch_free_page(page, 0);
> > kernel_map_pages(page, 1, 0);
>
> Hi Balbir,
>
> You generally want to do these like:
>
> foo = page_assign_page_cgroup(page, NULL);
> VM_BUG_ON(foo);
>
> Some embedded people have been known to optimize kernel size like this:
>
> #define VM_BUG_ON(x) do{}while(0)
Balbir's patch looks fine to me: I don't get your point there, Dave.
Hugh
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