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    SubjectRe: [PATCH 2/6] change alloc function in pcpu_alloc_pages

    On 04/15/2010 05:00 PM, Minchan Kim wrote:
    > Yes. I don't like it.
    > With it, someone who does care about API usage uses alloc_pages_exact_node but
    > someone who don't have a time or careless uses alloc_pages_node.
    > It would make API fragmentation and not good.
    > Maybe we can weed out -1 and make new API which is more clear.
    > * struct page *alloc_pages_any_node(gfp_t gfp_mask, unsigned int order);
    > * struct page *alloc_pages_exact_node(int nid, gfp_mask, unsigned int order);

    I'm not an expert on that part of the kernel but isn't
    alloc_pages_any_node() identical to alloc_pages_exact_node()? All
    that's necessary to do now is to weed out callers which pass in
    negative nid to alloc_pages_node(), right? If so, why not just do a
    clean sweep of alloc_pages_node() users and update them so that they
    don't call in w/ -1 nid and add WARN_ON_ONCE() in alloc_pages_node()?
    Is there any reason to keep both variants going forward? If not,
    introducing new API just to weed out invalid usages seems like an



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