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| author |   Dan Williams <dan.j.williams@intel.com> | 2018-04-05 16:24:28 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2018-04-05 21:36:26 -0700 |
| commit | c1d53b92b95c23909de11a97bcc51f26a9509231 (patch) | |
| tree | 69f9c00e092765491b793988d4bf55a6e1854999 /drivers/dax | |
| parent | mm, hugetlbfs: introduce ->pagesize() to vm_operations_struct (diff) | |
| download | linux-dev-c1d53b92b95c23909de11a97bcc51f26a9509231.tar.xz linux-dev-c1d53b92b95c23909de11a97bcc51f26a9509231.zip | |
device-dax: implement ->pagesize() for smaps to report MMUPageSize
Given that device-dax is making similar page mapping size guarantees as
hugetlbfs, emit the size in smaps and any other kernel path that
requests the mapping size of a vma.
Link: http://lkml.kernel.org/r/151996255287.27922.18397777516059080245.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reported-by: Jane Chu <jane.chu@oracle.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/dax')
| -rw-r--r-- | drivers/dax/device.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/dax/device.c b/drivers/dax/device.c index 2137dbc29877..0b61f48f21a6 100644 --- a/drivers/dax/device.c +++ b/drivers/dax/device.c @@ -439,10 +439,20 @@ static int dev_dax_split(struct vm_area_struct *vma, unsigned long addr) return 0; } +static unsigned long dev_dax_pagesize(struct vm_area_struct *vma) +{ + struct file *filp = vma->vm_file; + struct dev_dax *dev_dax = filp->private_data; + struct dax_region *dax_region = dev_dax->region; + + return dax_region->align; +} + static const struct vm_operations_struct dax_vm_ops = { .fault = dev_dax_fault, .huge_fault = dev_dax_huge_fault, .split = dev_dax_split, + .pagesize = dev_dax_pagesize, }; static int dax_mmap(struct file *filp, struct vm_area_struct *vma) |