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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>
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Subject: Re: [PATCH 2/3] mm: replace __HAVE_ARCH_PTE_SPECIAL
Message-ID: <20180409175757.GA12938@infradead.org>
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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.