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

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Message-ID: <4d0f02ec-4a36-34f1-3bfd-3f4758c4eea3@suse.com>
Date:   Mon, 8 Nov 2021 17:24:51 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Arnd Bergmann <arnd@...nel.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.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 08.11.21 12:14, 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>

Reviewed-by: Juergen Gross <jgross@...e.com>


Juergen


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