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/151996255287.27922.18397777516059080245.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx> Reported-by: Jane Chu <jane.chu@xxxxxxxxxx> Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> 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) _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
