linux-kernel - Re: [PATCH 1/7] perf tools: Track all user changed config bits

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Message-ID: <20251202101556.GR724103@e132581.arm.com>
Date: Tue, 2 Dec 2025 10:15:56 +0000
From: Leo Yan <leo.yan@....com>
To: James Clark <james.clark@...aro.org>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Mike Leach <mike.leach@...aro.org>,
	John Garry <john.g.garry@...cle.com>, Will Deacon <will@...nel.org>,
	Leo Yan <leo.yan@...ux.dev>, linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org, coresight@...ts.linaro.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/7] perf tools: Track all user changed config bits

On Mon, Dec 01, 2025 at 04:41:04PM +0000, Coresight ML wrote:

[...]

> +#define ADD_CONFIG_CHG(format_type, term_type, new_term)		\
> +{									\
> +	struct parse_events_term *term;					\
> +	u64 bits = 0;							\
> +	int type;							\
> +									\
> +	list_for_each_entry(term, &head_config->terms, list) {		\
> +		if (term->type_term == PARSE_EVENTS__TERM_TYPE_USER) {  \
> +			type = perf_pmu__format_type(pmu, term->config);\
> +			if (type != format_type)			\
> +				continue;				\
> +			bits |= perf_pmu__format_bits(pmu, term->config); \
> +		} else if (term->type_term == term_type) {		\
> +			bits = ~(u64)0;					\
> +		}							\
> +	}								\
> +									\
> +	if (bits)							\
> +		ADD_CONFIG_TERM_VAL(new_term, cfg_chg, bits, false);	\
> +	return 0;							\

Nitpick: "return 0" is not needed here.  Otherwise:

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