linux-kernel - Re: [PATCH v2 4/5] x86/bpf: Fix 64-bit JIT frame pointer usage

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Date:   Fri, 14 Jun 2019 16:23:41 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     X86 ML <x86@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, Peter Zijlstra <peterz@...radead.org>,
        Song Liu <songliubraving@...com>,
        Kairui Song <kasong@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        David Laight <David.Laight@...lab.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v2 4/5] x86/bpf: Fix 64-bit JIT frame pointer usage

On Fri, Jun 14, 2019 at 4:13 PM Josh Poimboeuf <jpoimboe@...hat.com> wrote:
>
> On Fri, Jun 14, 2019 at 02:27:30PM -0700, Alexei Starovoitov wrote:
> > On Fri, Jun 14, 2019 at 2:19 PM Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> > >
> > > On Fri, Jun 14, 2019 at 02:05:56PM -0700, Alexei Starovoitov wrote:
> > > > Have you tested it ?
> > > > I really doubt, since in my test both CONFIG_UNWINDER_ORC and
> > > > CONFIG_UNWINDER_FRAME_POINTER failed to unwind through such odd frame.
> > >
> > > Hm, are you seeing selftest failures?  They seem to work for me.
> > >
> > > > Here is much simple patch that I mentioned in the email yesterday,
> > > > but you failed to listen instead of focusing on perceived 'code readability'.
> > > >
> > > > It makes one proper frame and both frame and orc unwinders are happy.
> > >
> > > I'm on my way out the door and I just skimmed it, but it looks fine.
> > >
> > > Some of the code and patch description look familiar, please be sure to
> > > give me proper credit.
> >
> > credit means something positive.
>
> So you only give credit for *good* stolen code.  I must have missed that
> section of the kernel patch guidelines.

what are you talking about?
you've posted one bad patch. I pointed out multiple issues in it.
Then proposed another bad idea. I pointed out another set of issues.
Than David proposed yet another idea that you've implemented
and claimed that it's working when it was not.
Then I got fed up with this thread and fix it for real by reverting
that old commit that I mentioned way earlier.
https://patchwork.ozlabs.org/patch/1116307/
Where do you see your code or ideas being used?
I see none.