linux-kernel - Re: [PATCH] x86/vm86: fix unused variable warning if THP is disabled.

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Date:   Mon, 13 Feb 2017 16:49:18 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
cc:     Jérémy Lefaure <jeremy.lefaure@....epita.fr>,
        x86@...nel.org, Borislav Petkov <bp@...e.de>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86/vm86: fix unused variable warning if THP is
 disabled.

On Mon, 13 Feb 2017, Kirill A. Shutemov wrote:

> GCC complaines on unused variable 'vma' in mark_screen_rdonly() if THP
> is disalbed:
> 
> arch/x86/kernel/vm86_32.c: In function ‘mark_screen_rdonly’:
> arch/x86/kernel/vm86_32.c:180:26: warning: unused variable ‘vma’
> [-Wunused-variable]
>    struct vm_area_struct *vma = find_vma(mm, 0xA0000);
>                              ^~~
> It shoudln't really. The whole block has to be eliminated as
> pmd_trans_huge() is 0 if THP is disabled.
 
Indeed. That's outright silly.