1 files changed, 16 insertions, 0 deletions

diff --git a/arch/Kconfig b/arch/Kconfig
index 7f8f281f2585..45bc593d10e1 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -94,6 +94,22 @@ config UPROBES
 
           If in doubt, say "N".
 
+config HAVE_64BIT_ALIGNED_ACCESS
+        def_bool 64BIT && !HAVE_EFFICIENT_UNALIGNED_ACCESS
+        help
+          Some architectures require 64 bit accesses to be 64 bit
+          aligned, which also requires structs containing 64 bit values
+          to be 64 bit aligned too. This includes some 32 bit
+          architectures which can do 64 bit accesses, as well as 64 bit
+          architectures without unaligned access.
+
+          This symbol should be selected by an architecture if 64 bit
+          accesses are required to be 64 bit aligned in this way even
+          though it is not a 64 bit architecture.
+
+          See Documentation/unaligned-memory-access.txt for more
+          information on the topic of unaligned memory accesses.
+
 config HAVE_EFFICIENT_UNALIGNED_ACCESS
         bool
         help