Re: [PATCH bpf-next 1/3] uprobes: encapsulate preparation of uprobe args buffer

[Oleg Nesterov <oleg@redhat.com>]

LGTM, one nit below.

On 03/12, Andrii Nakryiko wrote:
>
> +static struct uprobe_cpu_buffer *prepare_uprobe_buffer(struct trace_uprobe *tu,
> +						       struct pt_regs *regs)
> +{
> +	struct uprobe_cpu_buffer *ucb;
> +	int dsize, esize;
> +
> +	esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
> +	dsize = __get_data_size(&tu->tp, regs);
> +
> +	ucb = uprobe_buffer_get();
> +	ucb->dsize = dsize;
> +
> +	store_trace_args(ucb->buf, &tu->tp, regs, esize, dsize);
> +
> +	return ucb;
> +}

OK, but note that every user of ->dsize adds tp.size. So I think you can
simplify this code a bit more if you change prepare_uprobe_buffer() to do

	ucb->dsize = tu->tp.size + dsize;

and update the users.

Oleg.