The following patch can fix this build issue:

diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
index 0a8e75886..afd384ed8 100644
--- a/tools/testing/selftests/lib.mk
+++ b/tools/testing/selftests/lib.mk
@@ -16,7 +16,7 @@ TEST_GEN_PROGS := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_PROGS))
 TEST_GEN_PROGS_EXTENDED := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_PROGS_EXTENDED))
 TEST_GEN_FILES := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_FILES))
 
-top_srcdir ?= ../../../..
+top_srcdir ?= $(abspath $(dir $(lastword $(MAKEFILE_LIST)))/../../..)
 include $(top_srcdir)/scripts/subarch.include
 ARCH           ?= $(SUBARCH)

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https://bugs.launchpad.net/bugs/1808318

Title:
  powerpc test in ubuntu_kernel_selftest failed on Cosmic P8/P9

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