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-rw-r--r--arch/x86_64/Makefile6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86_64/Makefile b/arch/x86_64/Makefile
index 6d89ab762ff..20eb69bd5a6 100644
--- a/arch/x86_64/Makefile
+++ b/arch/x86_64/Makefile
@@ -24,6 +24,12 @@
# Fill in SRCARCH
SRCARCH := x86
+# BITS is used as extension for files which are available in a 32 bit
+# and a 64 bit version to simplify shared Makefiles.
+# e.g.: obj-y += foo_$(BITS).o
+BITS := 64
+export BITS
+
LDFLAGS := -m elf_x86_64
OBJCOPYFLAGS := -O binary -R .note -R .comment -S
LDFLAGS_vmlinux :=