perf tests record_offcpu: Fix shellcheck warnings about word splitting/quoting and signal names case

Running shellcheck on record_offcpu.sh throws below warning:

In tests/shell/record_offcpu.sh line 13:
  trap - exit term int
         ^--^ SC3049 (warning): In POSIX sh, using lower/mixed case for signal names is undefined.
              ^--^ SC3049 (warning): In POSIX sh, using lower/mixed case for signal names is undefined.
                   ^-^ SC3049 (warning): In POSIX sh, using lower/mixed case for signal names is undefined.

In tests/shell/record_offcpu.sh line 20:
trap trap_cleanup exit term int
                  ^--^ SC3049 (warning): In POSIX sh, using lower/mixed case for signal names is undefined.
                       ^--^ SC3049 (warning): In POSIX sh, using lower/mixed case for signal names is undefined.
                            ^-^ SC3049 (warning): In POSIX sh, using lower/mixed case for signal names is undefined.

In tests/shell/record_offcpu.sh line 25:
  if [ `id -u` != 0 ]
       ^-----^ SC2046 (warning): Quote this to prevent word splitting.

Fixed the warnings by:
- Capitalize signals(INT, TERM, EXIT) to avoid mixed/lower case naming of
signals.
- Adding quotes to avoid word splitting.

Result from shellcheck after patch changes:
     $ shellcheck -S warning record_offcpu.sh
     $

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]>

1 files changed, 3 insertions, 3 deletions

diff --git a/tools/perf/tests/shell/record_offcpu.sh b/tools/perf/tests/shell/record_offcpu.sh
index f062ae9a95e1..a0d14cd0aa79 100755
--- a/tools/perf/tests/shell/record_offcpu.sh
+++ b/tools/perf/tests/shell/record_offcpu.sh
@@ -10,19 +10,19 @@ perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
 cleanup() {
   rm -f ${perfdata}
   rm -f ${perfdata}.old
-  trap - exit term int
+  trap - EXIT TERM INT
 }
 
 trap_cleanup() {
   cleanup
   exit 1
 }
-trap trap_cleanup exit term int
+trap trap_cleanup EXIT TERM INT
 
 test_offcpu_priv() {
   echo "Checking off-cpu privilege"
 
-  if [ `id -u` != 0 ]
+  if [ "$(id -u)" != 0 ]
   then
     echo "off-cpu test [Skipped permission]"
     err=2