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From: Namhyung Kim <namhyung@kernel.org>
To: Yann Ylavic <ylavic.dev@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>,
	linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Tom Zanussi <tom.zanussi@linux.intel.com>,
	Clark Williams <williams@redhat.com>,
	Karim Yaghmour <karim.yaghmour@opersys.com>,
	Brendan Gregg <bgregg@netflix.com>,
	Joel Fernandes <joelaf@google.com>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	linux-rt-users@vger.kernel.org, kernel-team@lge.com
Subject: Re: [RFC][PATCH 07/10] tracing: Have zero size length in filter logic be full string
Date: Mon, 14 May 2018 11:23:09 +0900	[thread overview]
Message-ID: <20180514022309.GA9220@sejong> (raw)
In-Reply-To: <CAKQ1sVPS_rKYUVRRAU-zHKZqCNBKamBoHdHyhXOV+Ckifm1Jbw@mail.gmail.com>

Hi,

On Sat, May 12, 2018 at 08:32:18PM +0200, Yann Ylavic wrote:
> On Fri, May 11, 2018 at 9:49 PM, Steven Rostedt <rostedt@goodmis.org> wrote:
> []
> >
> >  static int regex_match_front(char *str, struct regex *r, int len)
> >  {
> > -       if (len < r->len)
> > +       if (len && len < r->len)
> >                 return 0;
> >
> > -       if (strncmp(str, r->pattern, r->len) == 0)
> > -               return 1;
> > -       return 0;
> > +       return strncmp(str, r->pattern, len) == 0;
> 
> strncmp(..., r->len) still?

Yep, I think so.  Otherwise it'll always return true when len is 0.

Thanks,
Namhyung

  reply	other threads:[~2018-05-14  2:22 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-11 19:49 [RFC][PATCH 00/10] tracing: Add triggers to trace_marker writes Steven Rostedt
2018-05-11 19:49 ` [RFC][PATCH 01/10] tracing: Do not reference event data in post call triggers Steven Rostedt
2018-05-12 12:04   ` Masami Hiramatsu
2018-05-11 19:49 ` [RFC][PATCH 02/10] tracing: Add __find_event_file() to find event files without restrictions Steven Rostedt
2018-05-11 19:49 ` [RFC][PATCH 03/10] tracing: Have event_trace_init() called by trace_init_tracefs() Steven Rostedt
2018-05-11 19:49 ` [RFC][PATCH 04/10] tracing: Add brackets in ftrace event dynamic arrays Steven Rostedt
2018-05-11 19:49 ` [RFC][PATCH 05/10] tracing: Do not show filter file for ftrace internal events Steven Rostedt
2018-05-11 19:49 ` [RFC][PATCH 06/10] tracing: Add trigger file for trace_markers tracefs/ftrace/print Steven Rostedt
2018-05-14  3:13   ` Namhyung Kim
2018-05-14 15:04     ` Steven Rostedt
2018-05-16  7:49       ` Namhyung Kim
2018-05-16 10:37         ` Steven Rostedt
2018-05-11 19:49 ` [RFC][PATCH 07/10] tracing: Have zero size length in filter logic be full string Steven Rostedt
2018-05-12 12:40   ` Masami Hiramatsu
2018-05-12 17:27     ` Steven Rostedt
2018-05-12 18:32   ` Yann Ylavic
2018-05-14  2:23     ` Namhyung Kim [this message]
2018-05-14 14:12     ` Steven Rostedt
2018-05-11 19:49 ` [RFC][PATCH 08/10] tracing: Prevent further users of zero size static arrays in trace events Steven Rostedt
2018-05-11 19:49 ` [RFC][PATCH 09/10] tracing: Allow histogram triggers to access ftrace internal events Steven Rostedt
2018-05-11 19:49 ` [RFC][PATCH 10/10] tracing: Document trace_marker triggers Steven Rostedt

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