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Wed, 11 Nov 2026 07:59:52 +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 07:59:52 +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 1/5] sched/rt: cpupri_find: Use cpumask_intersects where applicable Date: Wed, 11 Nov 2026 13:29:41 +0530 Message-ID: <20261111075945.3930230-2-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-Authority-Analysis: v=2.4 cv=POqaavqC c=1 sm=1 tr=0 ts=6af4207f cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=zJRp6_cAMcgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VnNF1IyMAAAA:8 a=gVD9RvEtEyC2a1f70PkA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTExMDAzMCBTYWx0ZWRfX1vPSN9Djqwtm 5eLPJtyldQk6//ss8tmtkoA3YTqHfZnmy2bKJaDFOYo9VXT4X6IIbwLvKZxSYlwMReugzZZT8Sd IvdtWJrg8rZzafxJ2f7JgYHvmlD2alWRWf0YdVJG9DOLCYtcJOGNWFjVlgGUfPxAsq1M23bGYQh Xp9HdolDWI0BMcCWmQvhs5/cIMSBWqLP6LMNc60OrMHPrq0CWg5GS/JDQQAdFXmQxyNgfJxn0r2 iTjH8QtaKQ/kbODbNtIbwklyh/36MzZEFnNZFcnW9YfF5IoBuIru2wNdbMrkl2OOpfJNCHvmIsv cYEjhQ++VOOBLCsHjxrpWMa132L2IKlN1zPjpzLAjH9uJ+u9K9urH4lEpaH9DScWUEwJnNdQAXP dPUD+4aNHuztfUJcrxEkSLHHxnprRDMLxjnnRyFVfdANLwVqzRze7pWsvWUZNfjZKyTCGbPz/g9 A3dS8wFHCMBHISLyM0Q== X-Proofpoint-Spam-Info: AW1haW4tMjYxMTExMDAzMCBTYWx0ZWRfX4CJUaEgY/vO6 uixkfByYl9yXA1fblRMkrtDcrxq9tqWnG8KKuM/bTjWti6cMaCsLj1WKiY5LmW7ckNkKCDMdxTc 7nPLf4KjiMtuIjyHzz78Cbiv8J9VyYg= X-Proofpoint-ORIG-GUID: -ZJLocmC9AkxYoAnMfyRxnXtCym-NYuA X-Proofpoint-GUID: SQnIckA7AjHtr6VrCfG6It8_LRUTx14p 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 priorityscore=1501 bulkscore=0 impostorscore=0 malwarescore=0 phishscore=0 lowpriorityscore=0 suspectscore=0 adultscore=0 spamscore=0 clxscore=1011 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/sched/cpupri.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/cpupri.c b/kernel/sched/cpupri.c index 8f2237e8b484..44d67fbc4ab2 100644 --- a/kernel/sched/cpupri.c +++ b/kernel/sched/cpupri.c @@ -97,7 +97,7 @@ static inline int __cpupri_find(struct cpupri *cp, struct task_struct *p, if (skip) return 0; - if (cpumask_any_and(&p->cpus_mask, vec->mask) >= nr_cpu_ids) + if (!cpumask_intersects(&p->cpus_mask, vec->mask)) return 0; if (lowest_mask) { -- 2.52.0