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Date: Mon, 2 Oct 2017 14:40:42 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: =?ISO-8859-1?Q?J=E9r=F4me?= Glisse <jglisse@redhat.com>
Cc: <linux-kernel@vger.kernel.org>, linux-mm@kvack.org,
        Ralph Campbell <rcampbell@nvidia.com>
Subject: Re: [PATCH] mm/hmm: constify hmm_devmem_page_get_drvdata()
 parameter
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On Mon,  2 Oct 2017 15:32:54 -0400 Jérôme Glisse <jglisse@redhat.com> wrote:

> From: Ralph Campbell <rcampbell@nvidia.com>
> 
> Constify pointer parameter to avoid issue when use from code that
> only has const struct page pointer to use in the first place.

That's rather vague.  Does such calling code exist in the kernel?  This
affects the which-kernel-gets-patched decision.