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

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Message-ID: <20171002214722.GA5184@redhat.com>
Date:   Mon, 2 Oct 2017 17:47:23 -0400
From:   Jerome Glisse <jglisse@...hat.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
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, Oct 02, 2017 at 02:40:42PM -0700, Andrew Morton wrote:
> 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.

This is use by device driver, no driver upstream yet so it does not
affect anybody upstream yet.

Jérôme