kmemleak_scan_area
extern void kmemleak_scan_area(const void *ptr, size_t size, gfp_t gfp) __ref;
EXPORT_SYMBOL(kmemleak_scan_area);
struct kmemleak_scan_area *area;
scan_area_cache = KMEM_CACHE(kmemleak_scan_area, SLAB_NOLEAKTRACE);
struct kmemleak_scan_area *area;
struct kmemleak_scan_area *area = NULL;
kmemleak_scan_area(&va->rb_node, SIZE_MAX, gfp_mask);