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-rw-r--r--Makefile4
1 files changed, 3 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index 2738966e1d37..1b0d84d49612 100644
--- a/Makefile
+++ b/Makefile
@@ -115,7 +115,9 @@ saved-output := $(KBUILD_OUTPUT)
KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
$(if $(KBUILD_OUTPUT),, \
$(error output directory "$(saved-output)" does not exist))
-
+# Check that OUTPUT directory is not the same as where we have kernel src
+$(if $(filter-out $(KBUILD_OUTPUT),$(shell /bin/pwd)),, \
+ $(error Output directory (O=...) specifies kernel src dir))
PHONY += $(MAKECMDGOALS)
$(filter-out _all,$(MAKECMDGOALS)) _all: