Commit c1d53b92 authored Apr 05, 2018 by Dan Williams Committed by Linus Torvalds Apr 05, 2018

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>

parent 05ea8860

drivers/dax/device.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -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)

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