[PATCH v1 1/1] selftests/cpu-hotplug: Make the script complaint with sh shell

[Hubert Mazur <hmazur@google.com>]

The script uses by default the bash shell that is inaccessible in
the x86 embedded devices. This leads to the syntax errors. To mitigate
this, change the interpreter to /bin/sh and properly assign the
FUNCNAME variable for each of the functions as 'sh' doesn't set this
env. Change the conditional check for being a root from not
existent UID and replace with command execution "id -u".

Signed-off-by: Hubert Mazur <hmazur@google.com>
---
 tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh b/tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh
index 6232a46ca6e1..9d5d61413443 100755
--- a/tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh
+++ b/tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 
 SYSFS=
@@ -10,7 +10,7 @@ prerequisite()
 {
 	msg="skip all tests:"
 
-	if [ $UID != 0 ]; then
+	if [ $(id -u) -ne 0 ]; then
 		echo $msg must be run as root >&2
 		exit $ksft_skip
 	fi
@@ -99,6 +99,7 @@ offline_cpu()
 
 online_cpu_expect_success()
 {
+	FUNCNAME="online_cpu_expect_success()"
 	local cpu=$1
 
 	if ! online_cpu $cpu; then
@@ -112,6 +113,8 @@ online_cpu_expect_success()
 
 online_cpu_expect_fail()
 {
+
+	FUNCNAME="online_cpu_expect_fail()"
 	local cpu=$1
 
 	if online_cpu $cpu 2> /dev/null; then
@@ -125,6 +128,8 @@ online_cpu_expect_fail()
 
 offline_cpu_expect_success()
 {
+
+	FUNCNAME="offline_cpu_expect_success()"
 	local cpu=$1
 
 	if ! offline_cpu $cpu; then
@@ -139,6 +144,7 @@ offline_cpu_expect_success()
 offline_cpu_expect_fail()
 {
 	local cpu=$1
+	FUNCNAME="offline_cpu_expect_fail()"
 
 	if offline_cpu $cpu 2> /dev/null; then
 		echo $FUNCNAME $cpu: unexpected success >&2
-- 
2.53.0.959.g497ff81fa9-goog