linux-kernel - Re: [PATCH 1/9] perf/jit: improve error messages from JVMTI

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Date:   Fri, 14 Oct 2016 12:20:05 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Stephane Eranian <eranian@...gle.com>
Cc:     Nilay Vaish <nilayvaish@...il.com>,
        Linux Kernel list <linux-kernel@...r.kernel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Anton Blanchard <anton@...abs.org>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH 1/9] perf/jit: improve error messages from JVMTI

Em Fri, Oct 14, 2016 at 05:57:25AM -0700, Stephane Eranian escreveu:
> On Fri, Oct 14, 2016 at 4:13 AM, Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
> > Em Thu, Oct 13, 2016 at 03:05:40PM -0500, Nilay Vaish escreveu:
> >> Do we not need to release the memory for err_msg if the condition for
> >> the 'if' statement evaluates to false?  Is it that we are going to
> >> kill the process, so no need to release the memory?

> > I guess that print_error() is called only when an error was returned
> > somewhere, that ret parameter, then if there was no error
> > (JVMTI_ERROR_NONE) in translating that numeric code to an string,
> > err_msg, it can then be used with warnx() (the main purpose of
> > print_error()) and then deallocated.
> >
> > For err != JVMTI_ERROR_NONE it silently goes back to the caller that
> > expected it to print something.
> >
> > I.e. probably it should have an else clause, something like:
> >
> >         if (err == JVMTI_ERROR_NONE) {
> >                 warnx("%s failed with %s", msg, err_msg);
> >                 (*jvmti)->Deallocate(jvmti, (unsigned char *)err_msg);
> >         } else {
> >                 warnx("%s failed with an unknown error %d", msg, (int)ret);
> >         }
> >
> > Stephane?
> I will fix all of the comments over the week-end. I am away from office today.

I have almost all of them fixed, will fix this one too, if you agree
with the analysis.

- Arnaldo