linux-kernel - Re: [PATCH v3] fs: dax: Adding new return type vm_fault

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Message-ID: <CAFqt6zZoU0O_w6stq+47ndBUY+yqk950nsyP_1ShTArQfxsSeQ@mail.gmail.com>
Date:   Sun, 22 Apr 2018 03:24:37 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Al Viro <viro@...iv.linux.org.uk>, mawilcox@...rosoft.com,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Michal Hocko <mhocko@...e.com>, jack@...e.cz,
        kirill.shutemov@...ux.intel.com,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] fs: dax: Adding new return type vm_fault_t

On Sun, Apr 22, 2018 at 3:04 AM, Matthew Wilcox <willy@...radead.org> wrote:
> On Sun, Apr 22, 2018 at 02:35:29AM +0530, Souptick Joarder wrote:
>> Use new return type vm_fault_t for fault handler. 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.
>>
>> commit 1c8f422059ae ("mm: change return type to vm_fault_t")
>>
>> There was an existing bug inside dax_load_hole()
>> if vm_insert_mixed had failed to allocate a page table,
>> we'd return VM_FAULT_NOPAGE instead of VM_FAULT_OOM.
>> With new vmf_insert_mixed() this issue is addressed.
>>
>> vm_insert_mixed_mkwrite has inefficiency when it returns
>> an error value, driver has to convert it to vm_fault_t
>> type. With new vmf_insert_mixed_mkwrite() this limitation
>> will be addressed.
>>
>> As new function vmf_insert_mixed_mkwrite() only called
>> from fs/dax.c, so keeping both the changes in a single
>> patch.
>>
>> Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
>
> Reviewed-by: Matthew Wilcox <mawilcox@...rosoft.com>
>
> There's a couple of minor things which could be tidied up, but not worth
> doing them as a revision to this patch.

Which tree this patch will go through ? mm or fsdevel ?