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Re: [patch] mremap.2: Add description of old_size == 0 functionality

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On 09/17/2017 06:52 PM, Jann Horn wrote:
> On Fri, Sep 15, 2017 at 2:37 PM, Mike Kravetz <mike.kravetz@oracle.com> wrote:
> [...]
>> A recent change was made to mremap so that an attempt to create a
>> duplicate a private mapping will fail.
>>
>> commit dba58d3b8c5045ad89c1c95d33d01451e3964db7
>> Author: Mike Kravetz <mike.kravetz@oracle.com>
>> Date:   Wed Sep 6 16:20:55 2017 -0700
>>
>>     mm/mremap: fail map duplication attempts for private mappings
>>
>> This return code is also documented here.
> [...]
>> diff --git a/man2/mremap.2 b/man2/mremap.2
> [...]
>> @@ -174,7 +189,12 @@ and
>>  or
>>  .B MREMAP_FIXED
>>  was specified without also specifying
>> -.BR MREMAP_MAYMOVE .
>> +.BR MREMAP_MAYMOVE ;
>> +or \fIold_size\fP was zero and \fIold_address\fP does not refer to a
>> +private anonymous mapping;
> 
> Shouldn't this be the other way around? "or old_size was zero and
> old_address refers to a private anonymous mapping"?

Thanks Jann,

Yes that is wrong.  In addition, the description of this functionality
in the section before this is also incorrect.

I will fix both in a new version of the patch.

-- 
Mike Kravetz

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[patch] mremap.2: Add description of old_size == 0 functionality Mike Kravetz <mike.kravetz@oracle.com> - 2017-09-15 23:40 +0200
  Re: [patch] mremap.2: Add description of old_size == 0 functionality Mike Kravetz <mike.kravetz@oracle.com> - 2017-09-16 00:00 +0200
    Re: [patch] mremap.2: Add description of old_size == 0 functionality Florian Weimer <fweimer@redhat.com> - 2017-09-18 15:50 +0200
      Re: [patch] mremap.2: Add description of old_size == 0 functionality Mike Kravetz <mike.kravetz@oracle.com> - 2017-09-18 19:20 +0200
        Re: [patch] mremap.2: Add description of old_size == 0 functionality Florian Weimer <fweimer@redhat.com> - 2017-09-19 14:20 +0200
          [patch v2] mremap.2: Add description of old_size == 0 functionality Mike Kravetz <mike.kravetz@oracle.com> - 2017-09-19 23:50 +0200
            Re: [patch v2] mremap.2: Add description of old_size == 0  functionality "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com> - 2017-09-20 09:30 +0200
              Re: [patch v2] mremap.2: Add description of old_size == 0  functionality Michal Hocko <mhocko@kernel.org> - 2017-09-25 14:40 +0200
                Re: [patch v2] mremap.2: Add description of old_size == 0 functionality "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com> - 2017-09-25 14:50 +0200
              Re: [patch v2] mremap.2: Add description of old_size == 0  functionality Mike Kravetz <mike.kravetz@oracle.com> - 2017-09-25 18:40 +0200
                Re: [patch v2] mremap.2: Add description of old_size == 0 functionality "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com> - 2017-09-25 21:30 +0200
          Re: [patch] mremap.2: Add description of old_size == 0 functionality Michal Hocko <mhocko@kernel.org> - 2017-09-25 14:40 +0200
            Re: [patch] mremap.2: Add description of old_size == 0 functionality Florian Weimer <fweimer@redhat.com> - 2017-09-25 14:50 +0200
              Re: [patch] mremap.2: Add description of old_size == 0 functionality Michal Hocko <mhocko@kernel.org> - 2017-09-25 15:00 +0200
                Re: [patch] mremap.2: Add description of old_size == 0 functionality Florian Weimer <fweimer@redhat.com> - 2017-09-25 15:20 +0200
                Re: [patch] mremap.2: Add description of old_size == 0 functionality Michal Hocko <mhocko@kernel.org> - 2017-09-25 17:00 +0200
                Re: [patch] mremap.2: Add description of old_size == 0 functionality Florian Weimer <fweimer@redhat.com> - 2017-09-25 17:00 +0200
  Re: [patch] mremap.2: Add description of old_size == 0 functionality Jann Horn <jannh@google.com> - 2017-09-18 04:00 +0200
    Re: [patch] mremap.2: Add description of old_size == 0 functionality Mike Kravetz <mike.kravetz@oracle.com> - 2017-09-18 19:30 +0200

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