linux-kernel - Re: [PATCH V2 4/5] mm/hugetlb: Add prot_modify_start/commit sequence for hugetlb update

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Message-Id: <d7ee1b8c-2f45-f430-b413-9d511e7d78c4@linux.ibm.com>
Date:   Thu, 29 Nov 2018 11:53:06 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     mpe@...erman.id.au, benh@...nel.crashing.org, paulus@...ba.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH V2 4/5] mm/hugetlb: Add prot_modify_start/commit sequence
 for hugetlb update

On 11/29/18 3:40 AM, Andrew Morton wrote:
> On Wed, 28 Nov 2018 20:04:37 +0530 "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com> wrote:
> 
>> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
> 
> Some explanation of the motivation would be useful.

I will update the commit message.


> 
>>   include/linux/hugetlb.h | 18 ++++++++++++++++++
>>   mm/hugetlb.c            |  8 +++++---
>>   2 files changed, 23 insertions(+), 3 deletions(-)
>>
>> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
>> index 087fd5f48c91..e2a3b0c854eb 100644
>> --- a/include/linux/hugetlb.h
>> +++ b/include/linux/hugetlb.h
>> @@ -543,6 +543,24 @@ static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr
>>   	set_huge_pte_at(mm, addr, ptep, pte);
>>   }
>>   #endif
>> +
>> +#ifndef huge_ptep_modify_prot_start
>> +static inline pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
>> +						unsigned long addr, pte_t *ptep)
>> +{
>> +	return huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
>> +}
>> +#endif
> 
> #define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
> 
>> +#ifndef huge_ptep_modify_prot_commit
>> +static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
>> +						unsigned long addr, pte_t *ptep,
>> +						pte_t old_pte, pte_t pte)
>> +{
>> +	set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
>> +}
>> +#endif
> 
> #define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit
> 
> 

Will update.

-aneesh