selftests/kexec: fix test_kexec_jump build

The test_kexec_jump program builds correctly when invoked from the top-level
selftests/Makefile, which explicitly sets the OUTPUT variable. However,
building directly in tools/testing/selftests/kexec fails with:

make: *** No rule to make target '/test_kexec_jump', needed by 'test_kexec_jump.sh'. Stop.

This failure occurs because the Makefile rule relies on $(OUTPUT), which is
undefined in direct builds.

Fix this by listing test_kexec_jump in TEST_GEN_PROGS, the standard way to
declare generated test binaries in the kselftest framework. This ensures the
binary is built regardless of invocation context and properly removed by
make clean.

Link: https://lore.kernel.org/r/[e-mail]
Acked-by: Shuah Khan <[e-mail]>
Signed-off-by: Moon Hee Lee <[e-mail]>
Acked-by: Baoquan He <[e-mail]>
Acked-by: David Woodhouse <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

tools/testing/selftests/kexec/Makefile

···
 
 ifeq ($(IS_64_BIT)$(ARCH_PROCESSED),1x86)
 TEST_PROGS += test_kexec_jump.sh
-test_kexec_jump.sh: $(OUTPUT)/test_kexec_jump
+TEST_GEN_PROGS := test_kexec_jump
 endif
 
 include ../lib.mk