linux-kernel - Re: [PATCH] perf arm-spe: Only warn once for each unsupported address packet

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Message-ID: <Y9cn4NYvI6+XW302@leoy-yangtze.lan>
Date:   Mon, 30 Jan 2023 10:13:52 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Rob Herring <robh@...nel.org>
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@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        James Clark <james.clark@....com>,
        Will Deacon <will@...nel.org>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf arm-spe: Only warn once for each unsupported
 address packet

On Fri, Jan 27, 2023 at 02:55:46PM -0600, Rob Herring wrote:
> Unknown address packet indexes are not an error as the Arm architecture
> can (and has with SPEv1.2) define new ones and implementation defined
> ones are also allowed. The error message for every occurrence of the
> packet is needlessly noisy as well. Change the message to print just
> once for each unknown index.
> 
> Signed-off-by: Rob Herring <robh@...nel.org>

Reviewed-by: Leo Yan <leo.yan@...aro.org>

> ---
>  tools/perf/util/arm-spe-decoder/arm-spe-decoder.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c b/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c
> index 091987dd3966..40dcedfd75cd 100644
> --- a/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c
> +++ b/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c
> @@ -68,7 +68,11 @@ static u64 arm_spe_calc_ip(int index, u64 payload)
>  		/* Clean highest byte */
>  		payload = SPE_ADDR_PKT_ADDR_GET_BYTES_0_6(payload);
>  	} else {
> -		pr_err("unsupported address packet index: 0x%x\n", index);
> +		static u32 seen_idx = 0;
> +		if (!(seen_idx & BIT(index))) {
> +			seen_idx |= BIT(index);
> +			pr_warning("ignoring unsupported address packet index: 0x%x\n", index);
> +		}
>  	}
>  
>  	return payload;
> -- 
> 2.39.0
>