linux-kernel - Re: [PATCH] arm64: kvm: use -fno-jump-tables with clang

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Message-ID: <8c7be44f-086d-65e3-9969-8182261ce82f@arm.com>
Date:   Fri, 18 May 2018 18:45:03 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Sami Tolvanen <samitolvanen@...gle.com>, christoffer.dall@....com,
        Takahiro Akashi <takahiro.akashi@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: kvm: use -fno-jump-tables with clang

On 18/05/18 18:40, Nick Desaulniers wrote:
> On Fri, May 18, 2018 at 10:30 AM Marc Zyngier <marc.zyngier@....com> wrote:
>> I'm going to ask the question I've asked before when this patch cropped
>> up (must be the 4th time now):
> 
>> Is it guaranteed that this is the only case where LLVM/clang is going to
>> generate absolute addresses instead of using relative addressing?
> 
> It seems like if there's requirements that only relative addressing be
> used, then the compiler should be told explicitly about this restriction,
> no?

Certainly. What's the rune?

	M.
-- 
Jazz is not dead. It just smells funny...