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| author |   Dan Williams <dan.j.williams@intel.com> | 2016-01-15 16:56:55 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-15 17:56:32 -0800 |
| commit | 3565fce3a6597e91b8dee3e8e36ebf70f8b7ef9b (patch) | |
| tree | 54f05861c87cb2c2710552b61a46cb5831b06296 /mm/swap.c | |
| parent | mm, dax: dax-pmd vs thp-pmd vs hugetlbfs-pmd (diff) | |
| download | wireguard-linux-3565fce3a6597e91b8dee3e8e36ebf70f8b7ef9b.tar.xz wireguard-linux-3565fce3a6597e91b8dee3e8e36ebf70f8b7ef9b.zip | |
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.c | 1 |
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> |