linux-kernel - Re: [PATCH] vhost: silence an unused-variable warning

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Message-Id: <20190308.151726.1373226353046701716.davem@davemloft.net>
Date:   Fri, 08 Mar 2019 15:17:26 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     arnd@...db.de
Cc:     mst@...hat.com, jasowang@...hat.com, stefanha@...hat.com,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vhost: silence an unused-variable warning

From: Arnd Bergmann <arnd@...db.de>
Date: Wed,  6 Mar 2019 12:05:49 +0100

> On some architectures, the MMU can be disabled, leading to access_ok()
> becoming an empty macro that does not evaluate its size argument,
> which in turn produces an unused-variable warning:
> 
> drivers/vhost/vhost.c:1191:9: error: unused variable 's' [-Werror,-Wunused-variable]
>         size_t s = vhost_has_feature(vq, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0;
> 
> Mark the variable as __maybe_unused to shut up that warning.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

I'll apply this, thanks Arnd.