[PATCH v2 3/6] selftests: kvm: Use the default linux header path only when INSTALL_HDR_PATH not defined

[Xiaoyao Li <xiaoyao.li@xxxxxxxxx>]

This provides a way for lib.mk or parent Makefile to tell where the
linux headers are installed.

Signed-off-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
---
 tools/testing/selftests/kvm/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 504a5fb0fa71..6f08cc512e15 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -47,7 +47,7 @@ LIBKVM += $(LIBKVM_$(UNAME_M))
 # $(TEST_GEN_PROGS) starts with $(OUTPUT)/
 include ../lib.mk
 
-INSTALL_HDR_PATH = $(top_srcdir)/usr
+INSTALL_HDR_PATH ?= $(top_srcdir)/usr
 LINUX_HDR_PATH = $(INSTALL_HDR_PATH)/include/
 LINUX_TOOL_INCLUDE = $(top_srcdir)/tools/include
 LINUX_TOOL_ARCH_INCLUDE = $(top_srcdir)/tools/arch/x86/include
-- 
2.20.1