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From: Souptick Joarder <jrdr.linux@gmail.com>
Date: Sat, 12 May 2018 11:55:38 +0530
Message-ID: <CAFqt6zbauQJb29BSP5bdRNXxhfS9Y9FH+=yqODKWF6cnksG20w@mail.gmail.com>
Subject: Re: [PATCH v3] mm: Change return type to vm_fault_t
To: Joe Perches <joe@perches.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
        Michal Hocko <mhocko@suse.com>, Hugh Dickins <hughd@google.com>,
        Dan Williams <dan.j.williams@intel.com>,
        David Rientjes <rientjes@google.com>, mike.kravetz@oracle.com,
        n-horiguchi@ah.jp.nec.com,
        "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
        Linux-MM <linux-mm@kvack.org>, linux-kernel@vger.kernel.org,
        Matthew Wilcox <willy@infradead.org>
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On Sat, May 12, 2018 at 11:50 AM, Joe Perches <joe@perches.com> wrote:
> On Sat, 2018-05-12 at 11:47 +0530, Souptick Joarder wrote:
>> Use new return type vm_fault_t for fault handler
>> in struct vm_operations_struct. For now, this is
>> just documenting that the function returns a
>> VM_FAULT value rather than an errno.  Once all
>> instances are converted, vm_fault_t will become
>> a distinct type.
>
> trivia:
>
>> diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
> []
>> @@ -627,7 +627,7 @@ struct vm_special_mapping {
>>        * If non-NULL, then this is called to resolve page faults
>>        * on the special mapping.  If used, .pages is not checked.
>>        */
>> -     int (*fault)(const struct vm_special_mapping *sm,
>> +     vm_fault_t (*fault)(const struct vm_special_mapping *sm,
>>                    struct vm_area_struct *vma,
>>                    struct vm_fault *vmf);
>
>
> It'd be nicer to realign the 2nd and 3rd arguments
> on the subsequent lines.
>
>         vm_fault_t (*fault)(const struct vm_special_mapping *sm,
>                             struct vm_area_struct *vma,
>                             struct vm_fault *vmf);
>

Just now posted v3. Do you want me to send v4 again with
realignment ?