linux-kernel - Re: [PATCH] ARM:mm: fix kmap_atomic_to

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Date:	Wed, 7 Oct 2015 12:55:08 +0900
From:	Jongsung Kim <neidhard.kim@....com>
To:	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Chanho Min <chanho.min@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Gunho Lee <gunho.lee@....com>
Subject: Re: [PATCH] ARM:mm: fix kmap_atomic_to_page

Recently, we made a driver utilizing kmap_atomic_to_page. Of course, it's not mainlined. People may be using it outside mainline just like us.

vmalloc has vmalloc_to_page, pkmap has kmap_to page, and fixmap has kmap_atomic_to_page. Then.. how about letting virt_to_page do them all?


On 10/07/2015 10:37 AM, Nicolas Pitre wrote:
> On Tue, 6 Oct 2015, Russell King - ARM Linux wrote:
>
>> On Tue, Oct 06, 2015 at 08:09:33PM +0900, Chanho Min wrote:
>>> Since kmap_atomic returns the pkmap address without a new mapping to
>>> fixmap for the page that is already mapped by kmap, It should be
>>> considered for the pkmap address in kmap_atomic_to_page.
>> What's the reasoning behind this change, given that I can find lots of
>> definitions of kmap_atomic_to_page() in the kernel, but not a single
>> user of this.
>>
>> If there's no users, should we be deleting this code?
> I think commit 5bbeed12bdc3 provides the answer to that question.
>
>
> Nicolas
>

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