linux-kernel - Re: [PATCH] KVM: arm64: Drop 'const' from argument of vq

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Message-ID: <20190604085545.hsmxfqkpt2cbrhtw@vireshk-i7>
Date:   Tue, 4 Jun 2019 14:25:45 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     Dave Martin <Dave.Martin@....com>,
        Marc Zyngier <marc.zyngier@....com>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry@....com>,
        Suzuki K Pouloze <suzuki.poulose@....com>,
        Will Deacon <will.deacon@....com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: arm64: Drop 'const' from argument of vq_present()

On 04-06-19, 09:43, Catalin Marinas wrote:
> On Tue, Jun 04, 2019 at 10:13:19AM +0530, Viresh Kumar wrote:
> > We currently get following compilation warning:
> > 
> > arch/arm64/kvm/guest.c: In function 'set_sve_vls':
> > arch/arm64/kvm/guest.c:262:18: warning: passing argument 1 of 'vq_present' from incompatible pointer type
> > arch/arm64/kvm/guest.c:212:13: note: expected 'const u64 (* const)[8]' but argument is of type 'u64 (*)[8]'
> 
> Since the vq_present() function does not modify the vqs array, I don't
> understand why this warning. Compiler bug?

Probably yes. Also marking array argument to functions as const is a
right thing to do, to declare that the function wouldn't change the
array values.

I tried a recent toolchain and this doesn't happen anymore.

Sorry for the noise.

-- 
viresh