From 3565fce3a6597e91b8dee3e8e36ebf70f8b7ef9b Mon Sep 17 00:00:00 2001
From: Dan Williams
Date: Fri, 15 Jan 2016 16:56:55 -0800
Subject: mm, x86: get_user_pages() for dax mappings

A dax mapping establishes a pte with _PAGE_DEVMAP set when the driver
has established a devm_memremap_pages() mapping, i.e.  when the pfn_t
return from ->direct_access() has PFN_DEV and PFN_MAP set.  Later, when
encountering _PAGE_DEVMAP during a page table walk we lookup and pin a
struct dev_pagemap instance to keep the result of pfn_to_page() valid
until put_page().

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Tested-by: Logan Gunthorpe <logang@deltatee.com>
Cc: Dave Hansen <dave@sr71.net>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 mm/swap.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'mm/swap.c')

diff --git a/mm/swap.c b/mm/swap.c
index 674e2c93da4e..09fe5e97714a 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -24,6 +24,7 @@
 #include <linux/export.h>
 #include <linux/mm_inline.h>
 #include <linux/percpu_counter.h>
+#include <linux/memremap.h>
 #include <linux/percpu.h>
 #include <linux/cpu.h>
 #include <linux/notifier.h>
-- 
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