From mboxrd@z Thu Jan  1 00:00:00 1970
From: Matthew Wilcox <willy@infradead.org>
Subject: Re: [PATCH v2] mm: Introduce new function vm_insert_kmem_page
Date: Tue, 23 Oct 2018 05:59:28 -0700
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To: Souptick Joarder <jrdr.linux@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>, Kate Stewart <kstewart@linuxfoundation.org>, Michal Hocko <mhocko@suse.com>, Heiko Stuebner <heiko@sntech.de>, airlied@linux.ie, linux@dominikbrodowski.net, linux-kernel@vger.kernel.org, Linux-MM <linux-mm@kvack.org>, cpandya@codeaurora.org, linux1394-devel@lists.sourceforge.net, Marek Szyprowski <m.szyprowski@samsung.com>, ak@linux.intel.com, Minchan Kim <minchan@kernel.org>, linux-rockchip@lists.infradead.org, Russell King - ARM Linux <linux@armlinux.org.uk>, Peter Zijlstra <peterz@infradead.org>, linux-arm-kernel@lists.infradead.org, "Huang, Ying" <ying.huang@intel.com>, tchibo@google.com, aryabinin@virtuozzo.com, treding@nvidia.com, riel@redhat.com, Kees Cook <keescook@chromium.org>, Arnd Bergmann <arnd@arndb.de>, rppt@linux.vnet.ibm.com, dri-devel@lists.freedesktop.org, Dan Williams <dan.j.williams@intel.com>, Andrew Morton <akp>
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On Tue, Oct 23, 2018 at 06:03:42PM +0530, Souptick Joarder wrote:
> On Tue, Oct 23, 2018 at 5:54 PM Matthew Wilcox <willy@infradead.org> wrote:
> > On Tue, Oct 23, 2018 at 05:44:32PM +0530, Souptick Joarder wrote:
> > > Instruction from Matthew  Wilcox who is supervising the entire vm_fault_t
> > > migration work :-)
> >
> > Hang on.  That was for the initial vm_fault_t conversion in which each
> > step was clearly an improvement.  What you're looking at now is far
> > from that.
> 
> Ok. But my understanding was, the approach of vm_insert_range comes
> into discussion as part of converting vm_insert_page into vmf_insert_page
> which is still part of original vm_fault_t conversion discussion.  No ?

No.  The initial part (converting all page fault methods to vm_fault_t)
is done.  What remains undone (looking at akpm's tree) is changing the
typedef of vm_fault_t from int to unsigned int.  That will prevent new
page fault handlers with the wrong type from being added.

I don't necessarily want to get rid of vm_insert_page().  Maybe it will
make sense to do that, and maybe not.  What I do want to see is thought,
and not "Matthew told me to do it", when I didn't.