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From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: X86 ML <x86@kernel.org>, Alexei Starovoitov <ast@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Network Development <netdev@vger.kernel.org>,
	bpf <bpf@vger.kernel.org>, Peter Zijlstra <peterz@infradead.org>,
	Song Liu <songliubraving@fb.com>, Kairui Song <kasong@redhat.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	David Laight <David.Laight@aculab.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Borislav Petkov <bp@alien8.de>, Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH v2 4/5] x86/bpf: Fix 64-bit JIT frame pointer usage
Date: Fri, 14 Jun 2019 16:23:41 -0700	[thread overview]
Message-ID: <CAADnVQKOjvhpMQqjHvF-oX2U99WRCi+repgqmt6hiSObovxoaQ@mail.gmail.com> (raw)
In-Reply-To: <20190614231311.gfeb47rpjoholuov@treble>

On Fri, Jun 14, 2019 at 4:13 PM Josh Poimboeuf <jpoimboe@redhat.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@redhat.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.

  reply	other threads:[~2019-06-14 23:23 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-14 17:56 [PATCH v2 0/5] x86/bpf: unwinder fixes Josh Poimboeuf
2019-06-14 17:56 ` [PATCH v2 1/5] perf/x86: Always store regs->ip in perf_callchain_kernel() Josh Poimboeuf
2019-06-14 20:56   ` Alexei Starovoitov
2019-06-14 21:06     ` Josh Poimboeuf
2019-06-14 21:16       ` Steven Rostedt
2019-06-14 21:20         ` Song Liu
2019-06-14 17:56 ` [PATCH v2 2/5] objtool: Fix ORC unwinding in non-JIT BPF generated code Josh Poimboeuf
2019-06-14 20:58   ` Alexei Starovoitov
2019-06-14 21:07     ` Josh Poimboeuf
2019-06-14 21:09       ` Alexei Starovoitov
2019-06-14 21:19         ` Josh Poimboeuf
2019-06-14 21:22           ` Alexei Starovoitov
2019-06-14 23:17             ` Josh Poimboeuf
2019-06-14 23:30               ` Alexei Starovoitov
2019-06-15  0:02                 ` Josh Poimboeuf
2019-06-15  0:06                   ` abhja kaanlani
2019-06-15  0:07                   ` Alexei Starovoitov
2019-06-17 14:57     ` David Laight
2019-06-14 17:56 ` [PATCH v2 3/5] x86/bpf: Move epilogue generation to a dedicated function Josh Poimboeuf
2019-06-14 17:56 ` [PATCH v2 4/5] x86/bpf: Fix 64-bit JIT frame pointer usage Josh Poimboeuf
2019-06-14 21:05   ` Alexei Starovoitov
2019-06-14 21:19     ` Josh Poimboeuf
2019-06-14 21:27       ` Alexei Starovoitov
2019-06-14 23:13         ` Josh Poimboeuf
2019-06-14 23:23           ` Alexei Starovoitov [this message]
2019-06-14 23:54             ` Josh Poimboeuf
2019-06-15  0:02               ` Alexei Starovoitov
2019-06-15  4:27                 ` Josh Poimboeuf
2019-06-15  5:16                   ` Alexei Starovoitov
2019-06-15 12:57                     ` Josh Poimboeuf
2019-06-14 17:56 ` [PATCH v2 5/5] x86/unwind/orc: Fall back to using frame pointers for generated code Josh Poimboeuf

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