linux-kernel - Re: [PATCH 15/24] perf daemon: Add ping command

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Date:   Wed, 10 Feb 2021 09:51:46 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Ian Rogers <irogers@...gle.com>,
        Alexei Budankov <abudankov@...wei.com>
Subject: Re: [PATCH 15/24] perf daemon: Add ping command

Em Mon, Feb 08, 2021 at 09:08:59PM +0100, Jiri Olsa escreveu:
> +
> +	if (!pollfd.revents & POLLIN) {
> +		pr_err("failed: did not received an ack\n");
> +		goto out;
> +	}
> +

Fixed up this, pointed out by clang on many build containers, including
fedora:34:

Committer notes:

Fixed up bug pointed by clang:

Buggy:

  if (!pollfd.revents & POLLIN)

Correct code:

  if (!(pollfd.revents & POLLIN))

clang warning:

  builtin-daemon.c:560:6: error: logical not is only applied to the left hand side of this bitwise operator [-Werror,-Wlogical-not-parentheses]
          if (!pollfd.revents & POLLIN) {
              ^               ~
  builtin-daemon.c:560:6: note: add parentheses after the '!' to evaluate the bitwise operator first


- Arnaldo