linux-kernel - Re: [RFC PATCH 1/6] perf tools: Add WARN

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Message-ID: <YQgE1CBje091cL3t@kernel.org>
Date:   Mon, 2 Aug 2021 11:44:36 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     James Clark <james.clark@....com>
Cc:     mathieu.poirier@...aro.org, coresight@...ts.linaro.org,
        linux-perf-users@...r.kernel.org, leo.yan@...aro.org,
        suzuki.poulose@....com, mike.leach@...aro.org,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH 1/6] perf tools: Add WARN_ONCE equivalent for UI
 warnings

Em Thu, Jul 29, 2021 at 04:58:00PM +0100, James Clark escreveu:
> Currently WARN_ONCE prints to stderr and corrupts the TUI. Add
> equivalent methods for UI warnings.

This one and the the next 3 seem clean and useful, applying and then
waiting for people to comment on the coresight specific ones.

- Arnaldo
 
> Signed-off-by: James Clark <james.clark@....com>
> ---
>  tools/perf/util/debug.h | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/tools/perf/util/debug.h b/tools/perf/util/debug.h
> index 48f631966067..f99468a7f681 100644
> --- a/tools/perf/util/debug.h
> +++ b/tools/perf/util/debug.h
> @@ -22,6 +22,13 @@ extern int debug_data_convert;
>  	eprintf(0, verbose, pr_fmt(fmt), ##__VA_ARGS__)
>  #define pr_warning(fmt, ...) \
>  	eprintf(0, verbose, pr_fmt(fmt), ##__VA_ARGS__)
> +#define pr_warning_once(fmt, ...) ({		\
> +	static int __warned;			\
> +	if (unlikely(!__warned)) {		\
> +		pr_warning(fmt, ##__VA_ARGS__); \
> +		__warned = 1;			\
> +	}					\
> +})
>  #define pr_info(fmt, ...) \
>  	eprintf(0, verbose, pr_fmt(fmt), ##__VA_ARGS__)
>  #define pr_debug(fmt, ...) \
> @@ -55,6 +62,13 @@ void trace_event(union perf_event *event);
>  
>  int ui__error(const char *format, ...) __printf(1, 2);
>  int ui__warning(const char *format, ...) __printf(1, 2);
> +#define ui__warning_once(format, ...) ({		\
> +	static int __warned;				\
> +	if (unlikely(!__warned)) {			\
> +		ui__warning(format, ##__VA_ARGS__);	\
> +		__warned = 1;				\
> +	}						\
> +})
>  
>  void pr_stat(const char *fmt, ...);
>  
> -- 
> 2.28.0
> 

-- 

- Arnaldo