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    SubjectRe: [PATCH] Allocate memory cgroup structures in local nodes v2
    On Wed, May 04, 2011 at 01:26:23PM -0700, Andi Kleen wrote:
    > diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c
    > index 9905501..a362215 100644
    > --- a/mm/page_cgroup.c
    > +++ b/mm/page_cgroup.c
    > @@ -134,7 +134,7 @@ static void *__init_refok alloc_page_cgroup(size_t size, int nid)
    > {
    > void *addr = NULL;
    >
    > - addr = alloc_pages_exact(size, GFP_KERNEL | __GFP_NOWARN);
    > + addr = alloc_pages_exact_node(nid, GFP_KERNEL | __GFP_NOWARN, size);

    alloc_pages_exact_node is not the 'specify node as well'-version of
    alloc_pages_exact, it refers to 'exact node'. Thus the
    free_pages_exact call is no longer the right counter-part.

    alloc_pages_exact_node takes an order, not a size argument.

    alloc_pages_exact_node returns a pointer to the struct page, not to
    the allocated memory, like all other alloc_pages* functions with the
    exception of alloc_pages_exact.

    I don't think any of those mistakes even triggers a compiler warning.
    Wow. This API is so thoroughly fscked beyond belief that I think the
    only way to top this is to have one of the functions invert the bits
    of its return value depending on the parity of the uptime counter.


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