linux-kernel - Re: [PATCH v6 10/12] mmap locking API: rename mmap_sem to mmap

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Date:   Thu, 4 Jun 2020 16:16:08 +0800
From:   youling 257 <youling257@...il.com>
To:     Michel Lespinasse <walken@...gle.com>
Cc:     "Liam R . Howlett" <Liam.Howlett@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Hugh Dickins <hughd@...gle.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Jerome Glisse <jglisse@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Peter Zijlstra <peterz@...radead.org>,
        David Rientjes <rientjes@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Matthew Wilcox <willy@...radead.org>,
        Ying Han <yinghan@...gle.com>
Subject: Re: [PATCH v6 10/12] mmap locking API: rename mmap_sem to mmap_lock

2020-06-04 13:57 GMT+08:00, Michel Lespinasse <walken@...gle.com>:
> On Wed, Jun 3, 2020 at 9:35 PM youling 257 <youling257@...il.com> wrote:
>> I have build error about kernel/sys.c,
>>
>> kernel/sys.c: In function ‘prctl_set_vma’:
>> kernel/sys.c:2392:18: error:
>> ‘struct mm_struct’ has no member named ‘mmap_sem’; did you mean
>> ‘mmap_base’?
>>   2392 |  down_write(&mm->mmap_sem);
>>        |                  ^~~~~~~~
>>        |                  mmap_base
>> kernel/sys.c:2402:16: error:
>> ‘struct mm_struct’ has no member named ‘mmap_sem’; did you mean
>> ‘mmap_base’?
>>   2402 |  up_write(&mm->mmap_sem);
>>        |                ^~~~~~~~
>>        |                mmap_base
>>
>> why not rename kernel/sys.c mmap_sem to mmap_lock?
>
> The proper fix would be to use the mmap locking apis defined in
> include/linux/mmap_lock.h instead.
>
> However I would like more information about your report. Did you apply
> the series yourself ? If so, what base tree did you apply it onto ? If
> not, what tree did you use that already included the series ?

I build linux next-20200603 tree have the kernel/sys.c error.

> Thanks,
>
> --
> Michel "Walken" Lespinasse
> A program is never fully debugged until the last user dies.
>