Commit c1d53b92 authored by Dan Williams's avatar Dan Williams Committed by Linus Torvalds

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: default avatarDan Williams <>
Reported-by: default avatarJane Chu <>
Reviewed-by: default avatarAndrew Morton <>
Cc: Benjamin Herrenschmidt <>
Cc: Michael Ellerman <>
Cc: Paul Mackerras <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 05ea8860
......@@ -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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