On Fri, 13 Jul 2007 16:37:32 +0800 Joe Jin <[email protected]> wrote:
> >
> > if (nid > MAX_NUMNODES) then that is a bug and we should report it (doing
> > this via a BUG() is OK) rather than quietly covering it up.
>
> I have create a patch to check if nid > MAX_NUMNODES, please apply it
> thanks
>
> Signed-off-by: Joe Jin <[email protected]>
> ---
>
> --- linux-2.6.22/include/linux/gfp.h.orig 2007-07-12 15:06:23.000000000 +0800
> +++ linux-2.6.22/include/linux/gfp.h 2007-07-13 16:23:52.000000000 +0800
> @@ -127,6 +127,8 @@ FASTCALL(__alloc_pages(gfp_t, unsigned i
> static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
> unsigned int order)
> {
> + BUG_ON(nid > MAX_NUMNODES);
> +
> if (unlikely(order >= MAX_ORDER))
> return NULL;
>
nope ;)
Would really prefer not to go adding overhead like this into a
frequently-called and frequently-inlined codepath.
If we do have a bug in a caller then the code will go on to overindex
NODE_DATA() which will hopefully produce a nice oops for at least some
people, and that's good enough.
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