[PATCH v3 2/3] resource: Add region_intersects_pmem()

[Toshi Kani <toshi.kani@hpe.com>]

Add region_intersects_pmem(), which checks if a specified address
range is persistent memory registered as "Persistent Memory" in
the iomem_resource list.

Note, it does not support legacy persistent memory registered as
"Persistent Memory (legacy)".  It can be supported by extending
this function or a separate function, if necessary.

This interface is exported so that it can be called from modules,
such as the EINJ driver.

Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Vishal Verma <vishal.l.verma@intel.com>
---
 include/linux/mm.h |    1 +
 kernel/resource.c  |   12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index c776af3..3825879 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -365,6 +365,7 @@ enum {
 int region_intersects(resource_size_t offset, size_t size, const char *type,
 			unsigned long flags);
 int region_intersects_ram(resource_size_t offset, size_t size);
+int region_intersects_pmem(resource_size_t offset, size_t size);
 
 /* Support for virtually mapped pages */
 struct page *vmalloc_to_page(const void *addr);
diff --git a/kernel/resource.c b/kernel/resource.c
index 15c133e..5230e63 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -548,6 +548,18 @@ int region_intersects_ram(resource_size_t start, size_t size)
 }
 EXPORT_SYMBOL_GPL(region_intersects_ram);
 
+/*
+ * region_intersects_pmem() checks if a specified address range is
+ * persistent memory, registered as "Persistent Memory", in the
+ * iomem_resource list.
+ */
+int region_intersects_pmem(resource_size_t start, size_t size)
+{
+	return region_intersects(start, size, "Persistent Memory",
+				 IORESOURCE_MEM);
+}
+EXPORT_SYMBOL_GPL(region_intersects_pmem);
+
 void __weak arch_remove_reservations(struct resource *avail)
 {
 }

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