The patch titled
Subject: device-dax: implement ->pagesize() for smaps to report MMUPageSize
has been added to the -mm tree. Its filename is
device-dax-implement-pagesize-for-smaps-to-report-mmupagesize.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/device-dax-implement-pagesize-for-smaps-to-report-mmupagesize.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/device-dax-implement-pagesize-for-smaps-to-report-mmupagesize.patch
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------------------------------------------------------
From: Dan Williams <dan.j.williams@xxxxxxxxx>
Subject: 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/151270386082.21215.150215755680990629.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Reported-by: Jane Chu <jane.chu@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/dax/device.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff -puN drivers/dax/device.c~device-dax-implement-pagesize-for-smaps-to-report-mmupagesize drivers/dax/device.c
--- a/drivers/dax/device.c~device-dax-implement-pagesize-for-smaps-to-report-mmupagesize
+++ a/drivers/dax/device.c
@@ -439,10 +439,20 @@ static int dev_dax_split(struct vm_area_
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)
_
Patches currently in -mm which might be from dan.j.williams@xxxxxxxxx are
mm-hugetlbfs-introduce-pagesize-to-vm_operations_struct.patch
device-dax-implement-pagesize-for-smaps-to-report-mmupagesize.patch
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