mm: vmalloc make lazy unmapping configurable

	vunmap_page_range(va->va_start, va->va_end);

}

static void vmap_debug_free_range(unsigned long start, unsigned long end)

{

	/*

	 * Unmap page tables and force a TLB flush immediately if

	 * CONFIG_DEBUG_PAGEALLOC is set. This catches use after free

	 * bugs similarly to those in linear kernel virtual address

	 * space after a page has been freed.

	 *

	 * All the lazy freeing logic is still retained, in order to

	 * minimise intrusiveness of this debugging feature.

	 *

	 * This is going to be *slow* (linear kernel virtual address

	 * debugging doesn't do a broadcast TLB flush so it is a lot

	 * faster).

	 */

#ifdef CONFIG_DEBUG_PAGEALLOC

	vunmap_page_range(start, end);

	flush_tlb_kernel_range(start, end);

#endif

}

/*

 * lazy_max_pages is the maximum amount of virtual address space we gather up

 * before attempting to purge with a TLB flush.

	BUG_ON(addr & (PAGE_SIZE-1));

	debug_check_no_locks_freed(mem, size);

	vmap_debug_free_range(addr, addr+size);

	if (likely(count <= VMAP_MAX_ALLOC))

		vb_free(mem, size);

	if (va && va->flags & VM_VM_AREA) {

		struct vm_struct *vm = va->private;

		struct vm_struct *tmp, **p;

		vmap_debug_free_range(va->va_start, va->va_end);

		free_unmap_vmap_area(va);

		vm->size -= PAGE_SIZE;