2012/7/9 David Rientjes <rientjes@xxxxxxxxxx>:
> On Mon, 9 Jul 2012, JoonSoo Kim wrote:
>
>> diff --git a/mm/slub.c b/mm/slub.c
>> index 8c691fa..5d41cad 100644
>> --- a/mm/slub.c
>> +++ b/mm/slub.c
>> @@ -1324,8 +1324,14 @@ static struct page *allocate_slab(struct
>> kmem_cache *s, gfp_t flags, int node)
>> && !(s->flags & (SLAB_NOTRACK | DEBUG_DEFAULT_FLAGS))) {
>> int pages = 1 << oo_order(oo);
>>
>> + if (flags & __GFP_WAIT)
>> + local_irq_enable();
>> +
>> kmemcheck_alloc_shadow(page, oo_order(oo), flags, node);
>>
>> + if (flags & __GFP_WAIT)
>> + local_irq_disable();
>> +
>> /*
>> * Objects from caches that have a constructor don't get
>> * cleared when they're allocated, so we need to do it here.
>
> This patch is suboptimal when the branch is taken since you just disabled
> irqs and now are immediately reenabling them and then disabling them
> again. (And your patch is also whitespace damaged, has no changelog, and
> isn't signed off so it can't be applied.)
My intent is just to provide reference, because there is no replay to
this thread when I see it.
> The correct fix is what I proposed at
> http://marc.info/?l=linux-kernel&m=133754837703630 and was awaiting
> testing. If Rus, Steven, or Fengguang could test this then we could add
> it as a stable backport as well.
Your patch looks good to me.
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