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Date: Sun, 24 Mar 2024 16:18:24 -0700 From: Ira Weiny <ira.weiny@...el.com> To: Dave Jiang <dave.jiang@...el.com>, Fan Ni <fan.ni@...sung.com>, Jonathan Cameron <Jonathan.Cameron@...wei.com>, Navneet Singh <navneet.singh@...el.com> Cc: Dan Williams <dan.j.williams@...el.com>, Davidlohr Bueso <dave@...olabs.net>, Alison Schofield <alison.schofield@...el.com>, Vishal Verma <vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>, linux-btrfs@...r.kernel.org, linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH 21/26] dax/region: Prevent range mapping allocation on sparse regions Sparse regions are not fully populated with memory and this complicates range mapping of dax devices on those regions. There is no use case for range mapping on sparse regions. Avoid the complication by prevent range mapping of dax devices on sparse regions. Signed-off-by: Ira Weiny <ira.weiny@...el.com> --- drivers/dax/bus.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c index bab19fc578d0..56dddaceeccb 100644 --- a/drivers/dax/bus.c +++ b/drivers/dax/bus.c @@ -1452,6 +1452,8 @@ static umode_t dev_dax_visible(struct kobject *kobj, struct attribute *a, int n) return 0; if (a == &dev_attr_mapping.attr && is_static(dax_region)) return 0; + if (a == &dev_attr_mapping.attr && is_sparse(dax_region)) + return 0; if ((a == &dev_attr_align.attr || a == &dev_attr_size.attr) && is_static(dax_region)) return 0444; -- 2.44.0
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