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From: Dan Williams <dan.j.williams@intel.com>
Date: Fri, 11 May 2018 09:34:36 -0700
Message-ID: <CAPcyv4i1=q45aqSHXkWvQQgXBqkwuHR2ZxXWmpbeQxptXCcAFA@mail.gmail.com>
Subject: Re: [PATCH v4] dax: Change return type to vm_fault_t
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To: Souptick Joarder <jrdr.linux@gmail.com>
Cc: Matthew Wilcox <willy@infradead.org>, Andrew Morton <akpm@linux-foundation.org>, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>, zi.yan@cs.rutgers.edu, Ross Zwisler <ross.zwisler@linux.intel.com>, "Huang, Ying" <ying.huang@intel.com>, Michal Hocko <mhocko@suse.com>, Peter Zijlstra <peterz@infradead.org>, "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>, David Rientjes <rientjes@google.com>, linux-nvdimm <linux-nvdimm@lists.01.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Linux MM <linux-mm@kvack.org>

On Fri, May 11, 2018 at 9:34 AM, Souptick Joarder <jrdr.linux@gmail.com> 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")
>
> Previously vm_insert_mixed() returns err which driver
> mapped into VM_FAULT_* type. The new function
> vmf_insert_mixed() will replace this inefficiency by
> returning VM_FAULT_* type.
>
> Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
> Reviewed-by: Matthew Wilcox <mawilcox@microsoft.com>
> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
> ---
> v2: Modified the change log
>
> v3: Updated the change log and
>     added Ross in review list
>
> v4: Addressed David's comment.
>     Changes in huge_memory.c put
>     together in a single patch that
>     it is bisectable in furture

Thanks, I'll carry this in the nvdimm tree since it collides with some
work-in progress development.