linux-kernel - Re: [PATCH] perf tools: use PTR_ERR_OR

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Date:   Thu, 6 Sep 2018 11:09:53 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ding Xiang <dingxiang@...s.chinamobile.com>
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, namhyung@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf tools: use PTR_ERR_OR_ZERO inetead of return code

On Thu, Sep 06, 2018 at 05:04:08PM +0800, Ding Xiang wrote:
> use PTR_ERR_OR_ZERO for bpf__setup_stdout return code
> 
> Signed-off-by: Ding Xiang <dingxiang@...s.chinamobile.com>
> ---
>  tools/perf/util/bpf-loader.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
> index 47aac41..f9ae1a9 100644
> --- a/tools/perf/util/bpf-loader.c
> +++ b/tools/perf/util/bpf-loader.c
> @@ -1615,7 +1615,7 @@ struct perf_evsel *bpf__setup_output_event(struct perf_evlist *evlist, const cha
>  int bpf__setup_stdout(struct perf_evlist *evlist)
>  {
>  	struct perf_evsel *evsel = bpf__setup_output_event(evlist, "__bpf_stdout__");
> -	return IS_ERR(evsel) ? PTR_ERR(evsel) : 0;
> +	return PTR_ERR_OR_ZERO(evsel);

you need to add that macro to tools/include/linux/err.h first...

[jolsa@...va perf]$ make JOBS=1
  BUILD:   Doing 'make -j1' parallel build
  CC       util/bpf-loader.o
util/bpf-loader.c: In function ‘bpf__setup_stdout’:
util/bpf-loader.c:1618:9: error: implicit declaration of function ‘PTR_ERR_OR_ZERO’; did you mean ‘IS_ERR_OR_NULL’? [-Werror=implicit-function-declaration]
  return PTR_ERR_OR_ZERO(evsel);
         ^~~~~~~~~~~~~~~
         IS_ERR_OR_NULL
util/bpf-loader.c:1618:9: error: nested extern declaration of ‘PTR_ERR_OR_ZERO’ [-Werror=nested-externs]
cc1: all warnings being treated as errors
mv: cannot stat 'util/.bpf-loader.o.tmp': No such file or directory

please at least compile the code before posting it ;-)

thanks,
jirka