This introduces the following functions:
- memblock_add_phys(), that registers regions in the 'physmem' memblock map if
  CONFIG_HAVE_MEMBLOCK_PHYS_MAP is set; otherwise, it is a nop
- memblock_is_physmem(), returns whether a physical address is classified as
  physical memory.

Signed-off-by: Ard Biesheuvel <redacted>
---
 include/linux/memblock.h | 10 ++++++++++
 mm/memblock.c            | 15 +++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index e8cc45307f8f..d32fe838c6ca 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h

@@ -365,6 +365,16 @@ static inline unsigned long memblock_region_reserved_end_pfn(const struct memblo
 #define __initdata_memblock
 #endif
 
+#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
+int memblock_add_phys(phys_addr_t base, phys_addr_t size);
+int memblock_is_physmem(phys_addr_t addr);
+#else
+static inline int memblock_add_phys(phys_addr_t base, phys_addr_t size)
+{
+	return 0;
+}
+#endif /* CONFIG_HAVE_MEMBLOCK_PHYS_MAP */
+
 #else
 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
 {

diff --git a/mm/memblock.c b/mm/memblock.c
index c27353beb260..107aa5ee2d7b 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c

@@ -586,6 +586,14 @@ int __init_memblock memblock_add(phys_addr_t base, phys_addr_t size)
 				   MAX_NUMNODES, 0);
 }
 
+#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
+int __init_memblock memblock_add_phys(phys_addr_t base, phys_addr_t size)
+{
+	return memblock_add_range(&memblock.physmem, base, size,
+				  MAX_NUMNODES, 0);
+}
+#endif
+
 /**
  * memblock_isolate_range - isolate given range into disjoint memblocks
  * @type: memblock type to isolate range for

@@ -1398,6 +1406,13 @@ int __init_memblock memblock_is_memory(phys_addr_t addr)
 	return memblock_search(&memblock.memory, addr) != -1;
 }
 
+#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
+int __init_memblock memblock_is_physmem(phys_addr_t addr)
+{
+	return memblock_search(&memblock.physmem, addr) != -1;
+}
+#endif
+
 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 int __init_memblock memblock_search_pfn_nid(unsigned long pfn,
 			 unsigned long *start_pfn, unsigned long *end_pfn)

-- 
1.8.3.2

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