linux-kernel - Re: [PATCH 11/11 v3] ftrace: Add recording of functions that caused recursion

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Message-ID: <20201106142738.GX20201@alley>
Date:   Fri, 6 Nov 2020 15:27:38 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Jonathan Corbet <corbet@....net>, Guo Ren <guoren@...nel.org>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Kees Cook <keescook@...omium.org>,
        Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        linux-doc@...r.kernel.org, linux-csky@...r.kernel.org,
        linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, live-patching@...r.kernel.org
Subject: Re: [PATCH 11/11 v3] ftrace: Add recording of functions that caused
 recursion

On Fri 2020-11-06 08:41:31, Steven Rostedt wrote:
> On Fri, 6 Nov 2020 14:13:17 +0100
> Petr Mladek <pmladek@...e.com> wrote:
> 
> > JFYI, the code reading and writing the cache looks good to me.
> > 
> > It is still possible that some entries might stay unused (filled
> > with zeroes) but it should be hard to hit in practice. It
> > is good enough from my POV.
> 
> You mean the part that was commented?

Yeah, it is the comment problem when nr_records is pushed forward.

> > 
> > I do not give Reviewed-by tag just because I somehow do not have power
> > to review the entire patch carefully enough at the moment.
> 
> No problem. Thanks for looking at it.
> 
> I'm adding a link to this thread, so if someone wants proof you helped out
> on this code, you can have them follow the links ;-)
> 
> Anyway, even if I push this to linux-next where I stop rebasing code
> (because of test coverage), I do rebase for adding tags. So if you ever get
> around at looking at this code, I can add that tag later (before the next
> merge window), or if you find something, I could fix it with a new patch and
> give you a Reported-by.

Good to know.

Best Regards,
Petr