perf test stat_bpf_counters_cgrp: Fix shellcheck issue about logical …

…operators

Running shellcheck on lock_contention.sh generates below warning:

In stat_bpf_counters_cgrp.sh line 28:
	if [ -d /sys/fs/cgroup/system.slice -a -d /sys/fs/cgroup/user.slice ]; then
                                            ^-- SC2166 (warning): Prefer [ p ] && [ q ] as [ p -a q ] is not well defined.

In stat_bpf_counters_cgrp.sh line 34:
	local self_cgrp=$(grep perf_event /proc/self/cgroup | cut -d: -f3)
        ^-------------^ SC3043 (warning): In POSIX sh, 'local' is undefined.
              ^-------^ SC2155 (warning): Declare and assign separately to avoid masking return values.
                        ^-- SC2046 (warning): Quote this to prevent word splitting.

In stat_bpf_counters_cgrp.sh line 51:
	local output
        ^----------^ SC3043 (warning): In POSIX sh, 'local' is undefined.

In stat_bpf_counters_cgrp.sh line 65:
	local output
        ^----------^ SC3043 (warning): In POSIX sh, 'local' is undefined.

Fixed above warnings by:
- Changing the expression [p -a q] to [p] && [q].
- Fixing shellcheck warnings for local usage, by prefixing
  function name to the variable.

Signed-off-by: Kajol Jain <[email protected]>
Acked-by: Ian Rogers <[email protected]>
Cc: Disha Goel <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Madhavan Srinivasan <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Athira Rajeev <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

tools/perf/tests/shell/stat_bpf_counters_cgrp.sh

@@ -25,50 +25,46 @@ check_bpf_counter()
 find_cgroups()
 {
 	# try usual systemd slices first
-	if [ -d /sys/fs/cgroup/system.slice -a -d /sys/fs/cgroup/user.slice ]; then
+	if [ -d /sys/fs/cgroup/system.slice ] && [ -d /sys/fs/cgroup/user.slice ]; then
 		test_cgroups="system.slice,user.slice"
 		return
 	fi
 
 	# try root and self cgroups
-	local self_cgrp=$(grep perf_event /proc/self/cgroup | cut -d: -f3)
-	if [ -z ${self_cgrp} ]; then
+	find_cgroups_self_cgrp=$(grep perf_event /proc/self/cgroup | cut -d: -f3)
+	if [ -z ${find_cgroups_self_cgrp} ]; then
 		# cgroup v2 doesn't specify perf_event
-		self_cgrp=$(grep ^0: /proc/self/cgroup | cut -d: -f3)
+		find_cgroups_self_cgrp=$(grep ^0: /proc/self/cgroup | cut -d: -f3)
 	fi
 
-	if [ -z ${self_cgrp} ]; then
+	if [ -z ${find_cgroups_self_cgrp} ]; then
 		test_cgroups="/"
 	else
-		test_cgroups="/,${self_cgrp}"
+		test_cgroups="/,${find_cgroups_self_cgrp}"
 	fi
 }
 
 # As cgroup events are cpu-wide, we cannot simply compare the result.
 # Just check if it runs without failure and has non-zero results.
 check_system_wide_counted()
 {
-	local output
-
-	output=$(perf stat -a --bpf-counters --for-each-cgroup ${test_cgroups} -e cpu-clock -x, sleep 1  2>&1)
-	if echo ${output} | grep -q -F "<not "; then
+	check_system_wide_counted_output=$(perf stat -a --bpf-counters --for-each-cgroup ${test_cgroups} -e cpu-clock -x, sleep 1  2>&1)
+	if echo ${check_system_wide_counted_output} | grep -q -F "<not "; then
 		echo "Some system-wide events are not counted"
 		if [ "${verbose}" = "1" ]; then
-			echo ${output}
+			echo ${check_system_wide_counted_output}
 		fi
 		exit 1
 	fi
 }
 
 check_cpu_list_counted()
 {
-	local output
-
-	output=$(perf stat -C 1 --bpf-counters --for-each-cgroup ${test_cgroups} -e cpu-clock -x, taskset -c 1 sleep 1  2>&1)
-	if echo ${output} | grep -q -F "<not "; then
+	check_cpu_list_counted_output=$(perf stat -C 1 --bpf-counters --for-each-cgroup ${test_cgroups} -e cpu-clock -x, taskset -c 1 sleep 1  2>&1)
+	if echo ${check_cpu_list_counted_output} | grep -q -F "<not "; then
 		echo "Some CPU events are not counted"
 		if [ "${verbose}" = "1" ]; then
-			echo ${output}
+			echo ${check_cpu_list_counted_output}
 		fi
 		exit 1
 	fi