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

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Message-ID: <20190614211916.jnxakyfwilcv6r57@treble>
Date:   Fri, 14 Jun 2019 16:19:16 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     x86@...nel.org, Alexei Starovoitov <ast@...nel.org>,
        linux-kernel@...r.kernel.org,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        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 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.

-- 
Josh