diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2016-01-16 00:56:55 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-16 01:56:32 (GMT) |
| commit | 3565fce3a6597e91b8dee3e8e36ebf70f8b7ef9b (patch) | |
| tree | 54f05861c87cb2c2710552b61a46cb5831b06296 /arch/x86/lib/msr-reg-export.c | |
| parent | 5c7fb56e5e3f7035dd798a8e1adee639f87043e5 (diff) | |
| download | linux-3565fce3a6597e91b8dee3e8e36ebf70f8b7ef9b.tar.xz | |
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 'arch/x86/lib/msr-reg-export.c')
0 files changed, 0 insertions, 0 deletions