linux-kernel - Re: [RFC PATCH v4 25/37] arm64: bpf: Skip validation of ___bpf_prog

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Date:   Fri, 29 Apr 2022 13:09:05 -0700
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Chen Zhongjin <chenzhongjin@...wei.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arch@...r.kernel.org, jthierry@...hat.com,
        catalin.marinas@....com, will@...nel.org, masahiroy@...nel.org,
        ycote@...hat.com, herbert@...dor.apana.org.au,
        mark.rutland@....com, davem@...emloft.net, ardb@...nel.org,
        maz@...nel.org, tglx@...utronix.de, luc.vanoostenryck@...il.com
Subject: Re: [RFC PATCH v4 25/37] arm64: bpf: Skip validation of
 ___bpf_prog_run

On Fri, Apr 29, 2022 at 01:13:40PM +0200, Peter Zijlstra wrote:
> On Fri, Apr 29, 2022 at 05:43:43PM +0800, Chen Zhongjin wrote:
> > There is a jump table encoded in ___bpf_prog_run and objtool-arm64
> > can't deal with it now. Skip validate it for arm64.
> 
> But, but, but, an earlier patch did -fno-jump-tables!

IIRC, -fno-jump-tables is specific to switch statements but this
function has a C-implemented jump table.

-- 
Josh