linux-kernel - Re: [PATCH] xen/balloon: fix unused-variable warning

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Date:   Tue, 9 Nov 2021 08:30:20 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Arnd Bergmann <arnd@...nel.org>, Juergen Gross <jgross@...e.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Oscar Salvador <osalvador@...e.de>,
        Pankaj Gupta <pankaj.gupta@...ud.ionos.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xen/balloon: fix unused-variable warning


On 11/8/21 6:14 AM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
>
> In configurations with CONFIG_XEN_BALLOON_MEMORY_HOTPLUG=n
> and CONFIG_XEN_BALLOON_MEMORY_HOTPLUG=y, gcc warns about an
> unused variable:
>
> drivers/xen/balloon.c:83:12: error: 'xen_hotplug_unpopulated' defined but not used [-Werror=unused-variable]
>
> Since this is always zero when CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
> is disabled, turn it into a preprocessor constant in that case.
>
> Fixes: 121f2faca2c0 ("xen/balloon: rename alloc/free_xenballooned_pages")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>



Applied to for-linus-5.16b


-boris