[PATCH 3/3] tools/perf/tests: Fix shellcheck warning in record_sideband.sh test

[Namhyung Kim]

On Thu, Sep 28, 2023 at 9:11 PM Athira Rajeev
<atrajeev at linux.vnet.ibm.com> wrote:
>
> Running shellcheck on record_sideband.sh throws below
> warning:
>
>         In tests/shell/record_sideband.sh line 25:
>           if ! perf record -o ${perfdata} -BN --no-bpf-event -C $1 true 2>&1 >/dev/null
>             ^--^ SC2069: To redirect stdout+stderr, 2>&1 must be last (or use '{ cmd > file; } 2>&1' to clarify).
>
> This shows shellcheck warning SC2069 where the redirection
> order needs to be fixed. Use { cmd > file; } 2>&1 to fix the
> redirection of perf record output
>
> Fixes: 23b97c7ee963 ("perf test: Add test case for record sideband events")
> Signed-off-by: Athira Rajeev <atrajeev at linux.vnet.ibm.com>
> ---
>  tools/perf/tests/shell/record_sideband.sh | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/perf/tests/shell/record_sideband.sh b/tools/perf/tests/shell/record_sideband.sh
> index 5024a7ce0c51..7e036763a43c 100755
> --- a/tools/perf/tests/shell/record_sideband.sh
> +++ b/tools/perf/tests/shell/record_sideband.sh
> @@ -22,7 +22,7 @@ trap trap_cleanup EXIT TERM INT
>
>  can_cpu_wide()
>  {
> -    if ! perf record -o ${perfdata} -BN --no-bpf-event -C $1 true 2>&1 >/dev/null
> +    if ! { perf record -o ${perfdata} -BN --no-bpf-event -C $1 true > /dev/null; } 2>&1

I think we usually go without braces.

Thanks,
Namhyung


>      then
>          echo "record sideband test [Skipped cannot record cpu$1]"
>          err=2
> --
> 2.31.1
>