Re: [patch 3/7] mm: speculative page references

Peter Zijlstra
2008-06-06T14:20:04Z

On Thu, 2008-06-05 at 19:43 +1000, npiggin@suse.de wrote:
> plain text document attachment (mm-speculative-get_page-hugh.patch)

> +static inline int page_cache_get_speculative(struct page *page)
> +{
> + VM_BUG_ON(in_interrupt());
> +
> +#ifndef CONFIG_SMP
> +# ifdef CONFIG_PREEMPT
> + VM_BUG_ON(!in_atomic());
> +# endif
> + /*
> + * Preempt must be disabled here - we rely on rcu_read_lock doing
> + * this for us.

Preemptible RCU is already in the tree, so I guess you'll have to
explcitly disable preemption if you require it.