mm: add vfree_atomic()

			const void *caller);

extern void vfree(const void *addr);

extern void vfree_atomic(const void *addr);

extern void *vmap(struct page **pages, unsigned int count,

			unsigned long flags, pgprot_t prot);

	return;

}

static inline void __vfree_deferred(const void *addr)

{

	/*

	 * Use raw_cpu_ptr() because this can be called from preemptible

	 * context. Preemption is absolutely fine here, because the llist_add()

	 * implementation is lockless, so it works even if we are adding to

	 * nother cpu's list.  schedule_work() should be fine with this too.

	 */

	struct vfree_deferred *p = raw_cpu_ptr(&vfree_deferred);

	if (llist_add((struct llist_node *)addr, &p->list))

		schedule_work(&p->wq);

}

/**

 *	vfree_atomic  -  release memory allocated by vmalloc()

 *	@addr:		memory base address

 *

 *	This one is just like vfree() but can be called in any atomic context

 *	except NMIs.

 */

void vfree_atomic(const void *addr)

{

	BUG_ON(in_nmi());

	kmemleak_free(addr);

	if (!addr)

		return;

	__vfree_deferred(addr);

}

/**

 *	vfree  -  release memory allocated by vmalloc()

 *	@addr:		memory base address

	if (!addr)

		return;

	if (unlikely(in_interrupt())) {

		struct vfree_deferred *p = this_cpu_ptr(&vfree_deferred);

		if (llist_add((struct llist_node *)addr, &p->list))

			schedule_work(&p->wq);

	} else

	if (unlikely(in_interrupt()))

		__vfree_deferred(addr);

	else

		__vunmap(addr, 1);

}

EXPORT_SYMBOL(vfree);