Merge tag 'libnvdimm-for-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm...

[mirror_ubuntu-bionic-kernel.git] / arch / arm64 / include / asm / memory.h

diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index d808bb68875142319302cef18e67057b70147437..6b4c3ad75a2a99b0760a38436b7d159bfe3209c3 100644 (file)
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -107,6 +107,14 @@ extern phys_addr_t         memstart_addr;
 /* PHYS_OFFSET - the physical address of the start of memory. */
 #define PHYS_OFFSET            ({ memstart_addr; })
 
+/*
+ * The maximum physical address that the linear direct mapping
+ * of system RAM can cover. (PAGE_OFFSET can be interpreted as
+ * a 2's complement signed quantity and negated to derive the
+ * maximum size of the linear mapping.)
+ */
+#define MAX_MEMBLOCK_ADDR      ({ memstart_addr - PAGE_OFFSET - 1; })
+
 /*
  * PFNs are used to describe any physical page; this means
  * PFN 0 == physical address 0.