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authorDan Williams <dan.j.williams@intel.com>2016-01-15 16:56:55 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-15 17:56:32 -0800
commit3565fce3a6597e91b8dee3e8e36ebf70f8b7ef9b (patch)
tree54f05861c87cb2c2710552b61a46cb5831b06296 /mm/swap.c
parent5c7fb56e5e3f7035dd798a8e1adee639f87043e5 (diff)
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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>
Diffstat (limited to 'mm/swap.c')
-rw-r--r--mm/swap.c1
1 files changed, 1 insertions, 0 deletions
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>