lib_ring_buffer_get_backend_pages_from_ctx(config, ctx);
offset &= chanb->buf_size - 1;
index = (offset & (chanb->subbuf_size - 1)) >> PAGE_SHIFT;
lib_ring_buffer_get_backend_pages_from_ctx(config, ctx);
offset &= chanb->buf_size - 1;
index = (offset & (chanb->subbuf_size - 1)) >> PAGE_SHIFT;