linux-kernel - Re: [PATCH 1/4] perf test: Fix non-bash issue with stat bpf counters

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Message-ID: <CAP-5=fXXomqjVv4bvqhCOGPD3Q4gfCh2eya07NyBksGbkNjxMQ@mail.gmail.com>
Date:   Mon, 21 Jun 2021 14:30:52 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Song Liu <songliubraving@...com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH 1/4] perf test: Fix non-bash issue with stat bpf counters

On Sun, Jun 20, 2021 at 2:55 PM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Hi Ian,
>
> On Thu, 17 Jun 2021 11:42:13 -0700 Ian Rogers <irogers@...gle.com> wrote:
> >
> > $(( .. )) is a bash feature but the test's interpreter is !/bin/sh,
> > switch the code to use expr.
>
> The $(( .. )) syntax is specified in POSIX (see
> https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_04),
> so unless this caused an actual problem, this change is unnecessary.

Agreed. The issue I was seeing was:

./tests/shell/stat_bpf_counters.sh: line 14: <not + <not / 10 : syntax
error: operand expected (error token is "<not + <not / 10 ")

but that syntax error is caused by running the test within a
hypervisor. I'll resend the patch set with this one dropped.

Thanks,
Ian

> --
> Cheers,
> Stephen Rothwell