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Fri, 12 Dec 2025 07:32:44 -0800 (PST) From: James Clark Date: Fri, 12 Dec 2025 17:32:19 +0200 Subject: [PATCH v3 02/12] perf evsel: Support sparse fields in evsel__set_config_if_unset() Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251212-james-perf-config-bits-v3-2-aa36a4846776@linaro.org> References: <20251212-james-perf-config-bits-v3-0-aa36a4846776@linaro.org> In-Reply-To: <20251212-james-perf-config-bits-v3-0-aa36a4846776@linaro.org> To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Suzuki K Poulose , Mike Leach , John Garry , Will Deacon , Leo Yan Cc: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, James Clark X-Mailer: b4 0.14.2 Sparse config fields are technically supported although currently unused. field_prep() only works for contiguous bitfields so replace it with pmu_format_value(). Signed-off-by: James Clark --- tools/perf/util/pmu.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index 956ea273c2c7805c0cb504fb7dcf996f79f5588d..2c26c8d76bed920c7b5b43beb86= 7e4d1bcaa2970 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -144,6 +144,8 @@ struct perf_pmu_format { }; =20 static int pmu_aliases_parse(struct perf_pmu *pmu); +static void pmu_format_value(unsigned long *format, __u64 value, __u64 *v, + bool zero); =20 static struct perf_pmu_format *perf_pmu__new_format(struct list_head *list= , char *name) { @@ -1381,7 +1383,6 @@ bool evsel__is_aux_event(const struct evsel *evsel) * the bit pattern. It is shifted into position by this function, so to set * something to true, pass 1 for val rather than a pre shifted value. */ -#define field_prep(_mask, _val) (((_val) << (ffsll(_mask) - 1)) & (_mask)) void evsel__set_config_if_unset(struct perf_pmu *pmu, struct evsel *evsel, const char *config_name, u64 val) { @@ -1398,8 +1399,7 @@ void evsel__set_config_if_unset(struct perf_pmu *pmu,= struct evsel *evsel, return; =20 /* Otherwise replace it */ - evsel->core.attr.config &=3D ~bits; - evsel->core.attr.config |=3D field_prep(bits, val); + pmu_format_value(&bits, val, &evsel->core.attr.config, /*zero=3D*/true); } =20 static struct perf_pmu_format * --=20 2.34.1