linux-kernel - Re: [PATCH v8 tip 5/9] tracing: allow BPF programs to call bpf_trace

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Message-ID: <550C94B5.80301@plumgrid.com>
Date:	Fri, 20 Mar 2015 14:44:21 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Ingo Molnar <mingo@...nel.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 v8 tip 5/9] tracing: allow BPF programs to call bpf_trace_printk()

On 3/20/15 2:22 PM, Steven Rostedt wrote:
>> +/* limited trace_printk()
>> + * only %d %u %x %ld %lu %lx %lld %llu %llx %p conversion specifiers allowed
>> + */
>
> Ah! Again, don't contaminate the rest of the kernel with net comment
> styles! :-)

ok :)

>> +		} else if (fmt[i] == 'p') {
>> +			mod[fmt_cnt]++;
>> +			i++;
>> +			if (!isspace(fmt[i]) && fmt[i] != 0)
>
> I wonder if we should allow punctuation here too? None alpha-numeric
> characters?

yes. just checked all of ispunct characters after %p.
All should be fine.

Thanks!
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