linux-kernel - RFC/error: Re: [PATCH 3/6] perf tools: Improve thread_stack_

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Date:   Thu, 20 Sep 2018 15:13:52 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: RFC/error: Re: [PATCH 3/6] perf tools: Improve thread_stack__event()
 for trace begin / end

Em Wed, Sep 19, 2018 at 02:23:35PM +0300, Adrian Hunter escreveu:
> +		return thread_stack__push(thread->ts, ret_addr,
> +					  flags && PERF_IP_FLAG_TRACE_END);
> +	} else if (flags & PERF_IP_FLAG_TRACE_BEGIN) {

Some of the build containers caught this:

util/thread-stack.c:274:14: error: use of logical '&&' with constant operand [-Werror,-Wconstant-logical-operand]
                                          flags && PERF_IP_FLAG_TRACE_END);
                                                ^  ~~~~~~~~~~~~~~~~~~~~~~
util/thread-stack.c:274:14: note: use '&' for a bitwise operation
                                          flags && PERF_IP_FLAG_TRACE_END);
                                                ^~
                                                &
util/thread-stack.c:274:14: note: remove constant to silence this warning
                                          flags && PERF_IP_FLAG_TRACE_END);
                                               ~^~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.


--------------------------

Should be a '&' as suggested by: 

  16   146.45 debian:9                      : FAIL gcc (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
  17   138.35 debian:experimental           : FAIL gcc (Debian 8.2.0-4) 8.2.0


I'm changing this here, please Ack.

- Arnaldo