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From:   Nick Desaulniers <ndesaulniers@google.com>
Date:   Mon, 1 May 2023 15:30:38 -0700
Message-ID: <CAKwvOdkgwHcZKndei2NcMn+Z8y1HjKCUpMxnNCbcCGm9EB-o0A@mail.gmail.com>
Subject: Re: [PATCH v3 1/3] kasan: switch kunit tests to console tracepoints
To:     Peter Collingbourne <pcc@google.com>
Cc:     Steven Rostedt <rostedt@goodmis.org>,
        Marco Elver <elver@google.com>, andrey.konovalov@linux.dev,
        Andrew Morton <akpm@linux-foundation.org>,
        Andrey Konovalov <andreyknvl@gmail.com>,
        Alexander Potapenko <glider@google.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Andrey Ryabinin <ryabinin.a.a@gmail.com>,
        kasan-dev@googlegroups.com, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org,
        Andrey Konovalov <andreyknvl@google.com>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        linux-trace-kernel@vger.kernel.org
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On Mon, May 1, 2023 at 3:02=E2=80=AFPM Peter Collingbourne <pcc@google.com>=
 wrote:
>
> On Thu, Feb 23, 2023 at 10:45=E2=80=AFPM Peter Collingbourne <pcc@google.=
com> wrote:
> >
> > On Wed, Feb 15, 2023 at 11:33 AM Steven Rostedt <rostedt@goodmis.org> w=
rote:
> > >
> > > On Wed, 15 Feb 2023 09:57:40 +0100
> > > Marco Elver <elver@google.com> wrote:
> > >
> > > > Yes, you are right, and it's something I've wondered how to do bett=
er
> > > > as well. Let's try to consult tracing maintainers on what the right
> > > > approach is.
> > >
> > > I have to go and revisit the config options for CONFIG_FTRACE and
> > > CONFIG_TRACING, as they were added when this all started (back in
> > > 2008), and the naming was rather all misnomers back then.
> > >
> > > "ftrace" is really for just the function tracing, but CONFIG_FTRACE
> > > really should just be for the function tracing infrastructure, and
> > > perhaps not even include trace events :-/ But at the time it was
> > > created, it was for all the "tracers" (this was added before trace
> > > events).
> >
> > It would be great to see this cleaned up. I found this aspect of how
> > tracing works rather confusing.
> >
> > So do you think it makes sense for the KASAN tests to "select TRACING"
> > for now if the code depends on the trace event infrastructure?
>
> Any thoughts? It looks like someone else got tripped up by this:
> https://reviews.llvm.org/D144057

https://reviews.llvm.org/D144057#4311029
Peter, please triple check.
--=20
Thanks,
~Nick Desaulniers