netdev - Re: [PATCH] arm64: bpf: fix JIT stack setup

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Message-ID: <CABg9mcvACuVK2=GBbnur94CsckN2TXRCCiXhX7A8jYQ7arMM+Q@mail.gmail.com>
Date:	Mon, 9 Nov 2015 12:00:29 -0800
From:	Z Lim <zlim.lnx@...il.com>
To:	"Shi, Yang" <yang.shi@...aro.org>
Cc:	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Alexei Starovoitov <ast@...nel.org>, daniel@...earbox.net,
	Xi Wang <xi.wang@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH] arm64: bpf: fix JIT stack setup

On Mon, Nov 9, 2015 at 10:08 AM, Shi, Yang <yang.shi@...aro.org> wrote:
> I added it to stay align with ARMv8 AAPCS to maintain the correct FP during
> function call. It makes us get correct stack backtrace.
>
> I think we'd better to keep compliant with ARMv8 AAPCS in BPF JIT prologue
> too.
>
> If nobody thinks it is necessary, we definitely could remove that change.

Oh no, I don't think anyone will say it's unnecessary!
I agree the A64_FP-related change is a good idea, so stack unwinding works.

How about splitting this into two patches? One for the BPF-related
bug, and another for A64 FP-handling.

Thanks again for tracking this down and improving things overall for arm64 :)

>
> Thanks,
> Yang
>
>
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