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Date:   Mon, 9 Apr 2018 10:57:57 -0700
From:   Christoph Hellwig <hch@infradead.org>
To:     Laurent Dufour <ldufour@linux.vnet.ibm.com>
Cc:     linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        linuxppc-dev@lists.ozlabs.org, x86@kernel.org,
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        Jonathan Corbet <corbet@lwn.net>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Yoshinori Sato <ysato@users.sourceforge.jp>,
        Rich Felker <dalias@libc.org>,
        "David S . Miller" <davem@davemloft.net>,
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        Ingo Molnar <mingo@redhat.com>,
        Vineet Gupta <vgupta@synopsys.com>,
        Palmer Dabbelt <palmer@sifive.com>,
        Albert Ou <albert@sifive.com>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        Heiko Carstens <heiko.carstens@de.ibm.com>
Subject: Re: [PATCH 2/3] mm: replace __HAVE_ARCH_PTE_SPECIAL
Message-ID: <20180409175757.GA12938@infradead.org>
References: <1523282229-20731-1-git-send-email-ldufour@linux.vnet.ibm.com>
 <1523282229-20731-3-git-send-email-ldufour@linux.vnet.ibm.com>
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> -#ifdef __HAVE_ARCH_PTE_SPECIAL
> +#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
>  # define HAVE_PTE_SPECIAL 1
>  #else
>  # define HAVE_PTE_SPECIAL 0

I'd say kill this odd indirection and just use the
CONFIG_ARCH_HAS_PTE_SPECIAL symbol directly.