On 07/28/2013 07:48 AM, SeungHun Lee wrote:
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index b8475ed..e644cf5 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -2408,7 +2408,7 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
> * be using allocators in order of preference for an area that is
> * too large.
> */
> - if (order >= MAX_ORDER) {
> + if (unlikely(order >= MAX_ORDER)) {
> WARN_ON_ONCE(!(gfp_mask & __GFP_NOWARN));
> return NULL;
> }
What problem is this patch solving? I can see doing this in hot paths,
or places where the compiler is known to be generating bad or suboptimal
code. but, this costs me 512 bytes of text size:
898384 Jul 29 15:40 mm/page_alloc.o.nothing
898896 Jul 29 15:40 mm/page_alloc.o.unlikely
I really don't think we should be adding these without having _concrete_
reasons for it.
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