linux-kernel - Re: [PATCH v9 tip 5/9] tracing: allow BPF programs to call bpf_trace

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Message-ID: <20150322111040.GA18695@gmail.com>
Date:	Sun, 22 Mar 2015 12:10:40 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	"David S. Miller" <davem@...emloft.net>,
	Daniel Borkmann <daniel@...earbox.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-api@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 tip 5/9] tracing: allow BPF programs to call
 bpf_trace_printk()


* Alexei Starovoitov <ast@...mgrid.com> wrote:

> +static const struct bpf_func_proto bpf_trace_printk_proto = {
> +	.func = bpf_trace_printk,
> +	.gpl_only = true,
> +	.ret_type = RET_INTEGER,
> +	.arg1_type = ARG_PTR_TO_STACK,
> +	.arg2_type = ARG_CONST_STACK_SIZE,
> +};

A nit, please align such initializations vertically, for more 
readability:

static const struct bpf_func_proto bpf_trace_printk_proto = {
	.func		= bpf_trace_printk,
	.gpl_only	= true,
	.ret_type	= RET_INTEGER,
	.arg1_type	= ARG_PTR_TO_STACK,
	.arg2_type	= ARG_CONST_STACK_SIZE,
};

(this applies to other patches as well.)

Thanks,

	Ingo
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