linux-kernel - Re: [PATCH 03/15] arm64: kvm: Fix symbol dependency in __hyp_call_panic

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Date:   Sun, 10 May 2020 12:14:29 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     David Brazdil <dbrazdil@...gle.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Will Deacon <will@...nel.org>, kvmarm@...ts.cs.columbia.edu,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/15] arm64: kvm: Fix symbol dependency in __hyp_call_panic_nvhe

Hi David,

On Thu, 07 May 2020 15:36:17 +0100,
David Brazdil <dbrazdil@...gle.com> wrote:
> 
> Hi Marc,
> 
> > 
> > What breaks without this constraint? Is it a fix that should go in
> > early? Otherwise looks good.
> 
> This only becomes an issue when __hyp_call_panic_nvhe() and
> __hyp_call_panic_vhe() are moved to separate files, so I don't think
> it's necessary to go in early.
> 
> Currently the string variable (declared static) is seen by the C
> compiler as used by __hyp_call_panic_vhe(). But when split, the
> variable in the nVHE source file becomes unused, is dropped by the
> compiler and the inline assembly's reference is unresolved. We could
> then alias __hyp_text___hyp_panic_string back to the VHE copy, but
> this is the right way of addressing it.

Thanks for the detailed explanation. I think some of it should make it
in the commit message, pointing what breaks and when.

	M.

-- 
Without deviation from the norm, progress is not possible.