linux-kernel - Re: [PATCH] auxdisplay/cfag12864bfb.c: Replace vm_insert

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Message-ID: <20180922122107.GA14042@bombadil.infradead.org>
Date:   Sat, 22 Sep 2018 05:21:07 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Souptick Joarder <jrdr.linux@...il.com>
Cc:     miguel.ojeda.sandonis@...il.com, linux-kernel@...r.kernel.org,
        akpm@...ux-foundation.org
Subject: Re: [PATCH] auxdisplay/cfag12864bfb.c: Replace vm_insert_page

On Fri, Sep 21, 2018 at 01:53:16AM +0530, Souptick Joarder wrote:
> There is a plan to remove vm_insert_page permanently
> and replace it with new API vmf_insert_page which will
> return vm_fault_t type. As part of it vm_insert_page
> is removed from this driver.
> 
> remap_pfn_range() will be used to map kernel memory to
> user vma.

I think this patch is dangerous.  It's not buggy *for this driver*,
but it gives the impression that it's safe to use remap_pfn_range()
for this *kind* of driver.