linux-kernel - Re: [PATCH] mm/hmm: constify hmm_devmem_page_get

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Message-Id: <20171002144042.e33ff3cf7dc95845e255d2c0@linux-foundation.org>
Date:   Mon, 2 Oct 2017 14:40:42 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Jérôme Glisse <jglisse@...hat.com>
Cc:     <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        Ralph Campbell <rcampbell@...dia.com>
Subject: Re: [PATCH] mm/hmm: constify hmm_devmem_page_get_drvdata()
 parameter

On Mon,  2 Oct 2017 15:32:54 -0400 Jérôme Glisse <jglisse@...hat.com> wrote:

> From: Ralph Campbell <rcampbell@...dia.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.