From: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Date: Mon, 13 Oct 2014 10:45:24 +0530
> Andrea Arcangeli <aarcange@xxxxxxxxxx> writes:
>
>> Hi Steve,
>>
>> On Fri, Sep 26, 2014 at 03:03:48PM +0100, Steve Capper wrote:
>>> This patch provides a general RCU implementation of get_user_pages_fast
>>> that can be used by architectures that perform hardware broadcast of
>>> TLB invalidations.
>>>
>>> It is based heavily on the PowerPC implementation by Nick Piggin.
>>
>> It'd be nice if you could also at the same time apply it to sparc and
>> powerpc in this same patchset to show the effectiveness of having a
>> generic version. Because if it's not a trivial drop-in replacement,
>> then this should go in arch/arm* instead of mm/gup.c...
>
> on ppc64 we have one challenge, we do need to support hugepd. At the pmd
> level we can have hugepte, normal pmd pointer or a pointer to hugepage
> directory which is used in case of some sub-architectures/platforms. ie,
> the below part of gup implementation in ppc64
>
> else if (is_hugepd(pmdp)) {
> if (!gup_hugepd((hugepd_t *)pmdp, PMD_SHIFT,
> addr, next, write, pages, nr))
> return 0;
Sparc has to deal with the same issue.
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