X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=arch%2FKconfig;h=5a1779c93940153b30ba84a561b75aaec1e109ea;hb=2c06aeb25ca92b839399c4e2c956cffc95b41978;hp=dcd91a85536a631057cd7cabec89583b63e1f468;hpb=f042fea0da78d9dc077a9c736b33b60eb8f35195;p=firefly-linux-kernel-4.4.55.git

diff --git a/arch/Kconfig b/arch/Kconfig
index dcd91a85536a..5a1779c93940 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -103,6 +103,22 @@ 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