On Tue, Feb 22, 2011 at 02:40:47PM +0100, Andrea Arcangeli wrote:
>  	spin_lock_irq(&zone->lru_lock);
>  	for (; low_pfn < end_pfn; low_pfn++) {
>  		struct page *page;
> +
> +		cond_resched();
> +

my bad, see the above spin_lock_irq oops...

I attached two replacement patches to apply in order (both of them
should be applied at the same time on top of git upstream, and they
shouldn't lockup this time).