[PATCH] ARM:mm: fix kmap_atomic_to_page

Jongsung Kim neidhard.kim at lge.com
Tue Oct 6 20:55:08 PDT 2015

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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