linux-kernel - Re: [RFC PATCH 1/3] mm: add function folio_in

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Message-ID: <74ee8221-883b-07e0-9665-81146960b92a@intel.com>
Date:   Sat, 8 Jul 2023 14:44:30 +0800
From:   "Yin, Fengwei" <fengwei.yin@...el.com>
To:     Yu Zhao <yuzhao@...gle.com>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <ryan.roberts@....com>, <shy828301@...il.com>,
        <akpm@...ux-foundation.org>, <willy@...radead.org>,
        <david@...hat.com>
Subject: Re: [RFC PATCH 1/3] mm: add function folio_in_range()



On 7/8/2023 1:47 PM, Yu Zhao wrote:
> On Fri, Jul 7, 2023 at 10:52 AM Yin Fengwei <fengwei.yin@...el.com> wrote:
>>
>> It will be used to check whether the folio is mapped to specific
>> VMA and whether the mapping address of folio is in the range.
>>
>> Signed-off-by: Yin Fengwei <fengwei.yin@...el.com>
>> ---
>>  mm/internal.h | 26 ++++++++++++++++++++++++++
>>  1 file changed, 26 insertions(+)
>>
>> diff --git a/mm/internal.h b/mm/internal.h
>> index f1276d90484ad..66117523d7d71 100644
>> --- a/mm/internal.h
>> +++ b/mm/internal.h
>> @@ -585,6 +585,32 @@ extern long faultin_vma_page_range(struct vm_area_struct *vma,
>>                                    bool write, int *locked);
>>  extern bool mlock_future_ok(struct mm_struct *mm, unsigned long flags,
>>                                unsigned long bytes);
>> +
>> +static inline bool
>> +folio_in_range(struct folio *folio, struct vm_area_struct *vma,
>> +               unsigned long start, unsigned long end)
> 
> Is there a caller that's not "folio_in_range(folio, vma,
> vma->vm_start, vma->vm_end)"?
I believe madvise() will use start/end from user space instead of vma start/end.

> 
> If not, then just "folio_within_vma(folio, vma)" or a wrapper on top
> of  folio_in_range().
Will add folio_within_vma() based on folio_in_range(). Thanks.

Regards
Yin, Fengwei