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Wed, 11 Nov 2026 08:00:01 +0000 (GMT) Received: from li-7bb28a4c-2dab-11b2-a85c-887b5c60d769.ibm.com.com (unknown [9.124.213.92]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 11 Nov 2026 08:00:01 +0000 (GMT) From: Shrikanth Hegde To: linux-kernel@vger.kernel.org, yury.norov@gmail.com, linux-perf-users@vger.kernel.org Cc: sshegde@linux.ibm.com, mingo@kernel.org, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, tglx@kernel.org, sudeep.holla@kernel.org, linux@rasmusvillemoes.dk Subject: [PATCH 3/5] perf: Use cpumask_intersects where applicable Date: Wed, 11 Nov 2026 13:29:43 +0530 Message-ID: <20261111075945.3930230-4-sshegde@linux.ibm.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20261111075945.3930230-1-sshegde@linux.ibm.com> References: <20261111075945.3930230-1-sshegde@linux.ibm.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Info: AW1haW4tMjYxMTExMDAzMCBTYWx0ZWRfX9HUt9bAOXVTi 7wwavZ6KsIrNkW/Gy1ugKba5iZ6m6Ha8Jad0hBkZoe9fSFFUE45qzOy013AEmm9aLXIf7maRFZA uV93D96bi93pnArdoVwkfK03iZqv8L8= X-Authority-Analysis: v=2.4 cv=GISdgeNK c=1 sm=1 tr=0 ts=6af42088 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=zJRp6_cAMcgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=515Tmr3Vc-2sszKO7bAA:9 X-Proofpoint-GUID: WDlNZdzKnf6xOwlw6xW646P2rMlDBBRi X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTExMDAzMCBTYWx0ZWRfX3OAESfSRNTZd +95gkvslBkXaD27zItiRurmMHNrGNOdh96fbzuxQe4g6FOUHfcIRXdaKZhS5Q+ls40F3X6F7jOU AZl3Klzx5e8JloQwMF+HPS8XPLGgvfoxL0At8sQloincCytHNJdkOMIFUQYKq33ig7YknK0jy/u /s4sBFcqnNaU8B5KK7I2WI6bf/DBWTzwXfgGpm1cnKEt6I4XIO6Jr0AJEv42WyfCcQrvZK28YEv 68c5DGnUFGOwJm7C8JXQKJAfjIJvylQYAJoijG+tKJk7XcKFMutU5a2T5BWGNiwFFNDVfJFCpiH KEmMcv0JUvnKK+baOfeHNtmTp8RJSRlcBmJWvk9RH+Tr1RVUeJaXO/xb0X88U/FZxIuVahVmur1 nnho9JNCDRCjAXBCBuirp3brsgqJepMt7Wcogf3EsRhnB5Q1v3ffvOC25/ZZGDTieMPYayBUFSL 1Ly5dN+du8Jsc1ebb9A== X-Proofpoint-ORIG-GUID: 0Gyhd9kZTBswYaRYrA5zj9pGa8Q1rV0C X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-11_02,2026-11-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 bulkscore=0 impostorscore=0 clxscore=1011 adultscore=0 priorityscore=1501 phishscore=0 spamscore=0 malwarescore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2611040001 definitions=main-2611110030 cpumask_any_and returns, usually the first cpu in the intersection of the two cpumasks. However, if the returned value is not used or only to check it against nr_cpu_ids, that implies whether the two cpumask have a bit in common. i.e cpumask_intersects. cpumask_any_and uses ffs on (addr1[idx] & addr2[idx]) whereas cpumask_intersects checks only (addr1[idx] & addr2[idx]). So replace such occurrences. Signed-off-by: Shrikanth Hegde --- kernel/events/core.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index a6c8e38a3110..f9fa1b47ddf4 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -13159,7 +13159,6 @@ static int perf_try_init_event(struct pmu *pmu, struct perf_event *event) if (pmu->scope != PERF_PMU_SCOPE_NONE && event->cpu >= 0) { const struct cpumask *cpumask; struct cpumask *pmu_cpumask; - int cpu; cpumask = perf_scope_cpu_topology_cpumask(pmu->scope, event->cpu); pmu_cpumask = perf_scope_cpumask(pmu->scope); @@ -13168,8 +13167,7 @@ static int perf_try_init_event(struct pmu *pmu, struct perf_event *event) if (!pmu_cpumask || !cpumask) goto err_destroy; - cpu = cpumask_any_and(pmu_cpumask, cpumask); - if (cpu >= nr_cpu_ids) + if (!cpumask_intersects(pmu_cpumask, cpumask)) goto err_destroy; event->event_caps |= PERF_EV_CAP_READ_SCOPE; @@ -15312,8 +15310,7 @@ static void perf_event_setup_cpumask(unsigned int cpu) if (WARN_ON_ONCE(!pmu_cpumask || !cpumask)) continue; - if (!cpumask_empty(cpumask) && - cpumask_any_and(pmu_cpumask, cpumask) >= nr_cpu_ids) + if (!cpumask_empty(cpumask) && !cpumask_intersects(pmu_cpumask, cpumask)) cpumask_set_cpu(cpu, pmu_cpumask); } end: -- 2.52.0