linux-kernel - Re: [PATCH 21/23] hugetlb/userfaultfd: Only drop uffd-wp special pte if required

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Message-ID: <5c198016-91ac-119f-a5a5-40c79c98182c@oracle.com>
Date:   Mon, 26 Apr 2021 16:09:25 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Peter Xu <peterx@...hat.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Jerome Glisse <jglisse@...hat.com>,
        Hugh Dickins <hughd@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH 21/23] hugetlb/userfaultfd: Only drop uffd-wp special pte
 if required

On 4/26/21 3:05 PM, Peter Xu wrote:
> On Mon, Apr 26, 2021 at 02:36:26PM -0700, Mike Kravetz wrote:
>> On 4/26/21 2:16 PM, Peter Xu wrote:
>>> On Fri, Apr 23, 2021 at 01:33:08PM -0700, Mike Kravetz wrote:
>>>> On 3/22/21 5:50 PM, Peter Xu wrote:
>>>>> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
>>>>> index 92710600596e..4047fa042782 100644
>>>>> --- a/include/linux/hugetlb.h
>>>>> +++ b/include/linux/hugetlb.h
>>>>> @@ -121,14 +121,15 @@ long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
>>>>>  			 unsigned long *, unsigned long *, long, unsigned int,
>>>>>  			 int *);
>>>>>  void unmap_hugepage_range(struct vm_area_struct *,
>>>>> -			  unsigned long, unsigned long, struct page *);
>>>>> +			  unsigned long, unsigned long, struct page *,
>>>>> +			  unsigned long);
>>>>>  void __unmap_hugepage_range_final(struct mmu_gather *tlb,
>>>>>  			  struct vm_area_struct *vma,
>>>>>  			  unsigned long start, unsigned long end,
>>>>> -			  struct page *ref_page);
>>>>> +			  struct page *ref_page, unsigned long zap_flags);
>>>>>  void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
>>>>>  				unsigned long start, unsigned long end,
>>>>> -				struct page *ref_page);
>>>>> +				struct page *ref_page, unsigned long zap_flags);
>>>>
>>>> Nothing introduced with your patch, but it seems __unmap_hugepage_range_final
>>>> does not need to be in the header and can be static in hugetlb.c.
>>>
>>> It seems to be used in unmap_single_vma() of mm/memory.c?
>>
>> Sorry, that should have been __unmap_hugepage_range.  No need for you to
>> address in this series.
> 
> Ah yes; I'd rather add a patch if you won't object, since my series will touch
> that definition.
> 

No objection if you want to fix, thanks.

-- 
Mike Kravetz