On (22/08/11 18:37), Alexey Romanov wrote: > @@ -1564,6 +1564,12 @@ static void zs_object_copy(struct size_class *class, unsigned long dst, > d_off += size; > d_size -= size; > > + /* Calling kunmap_atomic(d_addr) is necessary. kunmap_atomic() calls > + * must occurs in reverse order of calls to kmap_atomic(). > + * So, to call kunmap_atomic(s_addr) we should first call kunmap_atomic(d_addr). > + * For more details see: > + * https://lore.kernel.org/linux-mm/5512421D.4000603@xxxxxxxxxxx/ > + */ I'd drop the link part, Emails are not documentation, kmap_atomic is documented in Documentation/mm/highmem
