From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 403A7FD5F6F for ; Wed, 8 Apr 2026 04:30:49 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4fr97q1vFyz2ynh; Wed, 08 Apr 2026 14:29:27 +1000 (AEST) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=148.163.156.1 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1775622567; cv=none; b=ZkbkJd7LdpZ4mtag/TEkY7wgNINmx1bshTmtdbSyKcsaITQ7qmwL1eigeHjKMXgLcFS11cTBbBaRzZWV3ZDdcI6snEcjNlc9B66fQ5Ga07cWoa2yr5xGBpCR0olsHXn+5o8U4ITuFB0KKBmW0hUyEDAAa6sO/mois91GEgpcqMx6hXhXe7Oly30ts14pH+E+VrGRXbkez+e2zYGU4Q7VUx82U352oBK6vedBdzYPnCoi4req11gMVEUrVZIpXRb+cGjpxFMKKeDshqQeV4UpWGAFaBCv7czSQacljOBgRWiA9ot7yOtZFKU07oZNASjbIrEk5l5a+EGJKorU52zAeg== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1775622567; c=relaxed/relaxed; bh=nFJHyoz9CXtW3KpITY9KgxOr/aRJZiT52yeFnJ2Ts8c=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=LNR1TwwLqS0ts+by8wnUHOJGskoEk8WCeiWhwN3Jr4m7RVB/g4SXZQWGA6UzI3k4FjgiYUNBcHRyKAPZZnoMlImlo6AVC7vU2cIHJq46q/Dm5qMHd87FM3+/tmWt9EkilBf/QQ48ouk5/7NcawpWmXyB2UAYeygZQzI13X7BSeNjBAQzuTlW27ZVNWeacXk65xzVXNBZ0cZkm2MBNbSlxl/cu/FuUdQvH3FyMjmfyE54yVfgMFSK52m2Ej6ZWCEKi1K3oWBMp6zOfXR+Aup2CUZPw0CkQ/ZeaRz5pin7p46NyUPbxwkFzgPIzBYLo6yRsSb0UjxvJWmhPmb4gHYceA== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=DiCqsmQl; dkim-atps=neutral; spf=pass (client-ip=148.163.156.1; helo=mx0a-001b2d01.pphosted.com; envelope-from=maddy@linux.ibm.com; receiver=lists.ozlabs.org) smtp.mailfrom=linux.ibm.com Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=DiCqsmQl; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.ibm.com (client-ip=148.163.156.1; helo=mx0a-001b2d01.pphosted.com; envelope-from=maddy@linux.ibm.com; receiver=lists.ozlabs.org) Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4fr97p234kz2xm5 for ; Wed, 08 Apr 2026 14:29:26 +1000 (AEST) Received: from pps.filterd (m0356517.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 637EHr9w2301624; Wed, 8 Apr 2026 04:29:20 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=pp1; bh=nFJHyo z9CXtW3KpITY9KgxOr/aRJZiT52yeFnJ2Ts8c=; b=DiCqsmQlx9KBQVDVPKQdxf TptWFU3KGbbjmurYf/yN+2iu+N8kwjf7w4C2+9X8aRJArWnlIURy6zfH76IG800k 1HG6l1qATBE7Bxxk1KTaTpD3Z08K+DXbkbdpNTdcD4UA+Ql2Em7KM+CzRKerVZZC F0QeKbWHYenNLtdlP4kwe8mR9zNIQ8In2lpB41Gix0T10v+JRCRrrPwq2M9TVgdZ WlaKbwVlOn8WmeXJ5t3yTdgV7auuXzXwG7XQDXk3egHF8fH5uzLX8moeahceMgxq 4IAtjAZcNSn7rnqzsnQb/kEcmHn0bqjVZDKCO+/X5LnpL58WlR92J+NMhsYi5uYg == Received: from ppma13.dal12v.mail.ibm.com (dd.9e.1632.ip4.static.sl-reverse.com [50.22.158.221]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4dcn2fe793-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 08 Apr 2026 04:29:20 +0000 (GMT) Received: from pps.filterd (ppma13.dal12v.mail.ibm.com [127.0.0.1]) by ppma13.dal12v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 63800NQk018877; Wed, 8 Apr 2026 04:29:19 GMT Received: from smtprelay05.fra02v.mail.ibm.com ([9.218.2.225]) by ppma13.dal12v.mail.ibm.com (PPS) with ESMTPS id 4dcme9e0ce-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 08 Apr 2026 04:29:19 +0000 Received: from smtpav05.fra02v.mail.ibm.com (smtpav05.fra02v.mail.ibm.com [10.20.54.104]) by smtprelay05.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 6384TFr146072204 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 8 Apr 2026 04:29:15 GMT Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9E35A20043; Wed, 8 Apr 2026 04:29:15 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F07DE20040; Wed, 8 Apr 2026 04:29:12 +0000 (GMT) Received: from Linuxdev.bl1-in.ibm.com (unknown [9.123.3.0]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 8 Apr 2026 04:29:12 +0000 (GMT) From: Madhavan Srinivasan To: linuxppc-dev@lists.ozlabs.org, Shrikanth Hegde Cc: chleroy@kernel.org, nysal@linux.ibm.com, mkchauras@linux.ibm.com, rafael@kernel.org, daniel.lezcano@kernel.org, christian.loehle@arm.com, mkchauras@gmail.com, npiggin@gmail.com, linux-pm@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH v2] cpuidle: powerpc: avoid double clear when breaking snooze Date: Wed, 8 Apr 2026 09:59:12 +0530 Message-ID: <177562236430.1381144.27958537257316890.b4-ty@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260311061709.1230440-1-sshegde@linux.ibm.com> References: <20260311061709.1230440-1-sshegde@linux.ibm.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDA4MDAzNiBTYWx0ZWRfXwPg28izPWoLf bQYnD/oHMPaCXq9W5q/syIjFJKnrAwdh1jdzE0KzsFXLp+3llLN4HAARpeMrw/Fi756loQC0Oaf sB2mHHubp/UT9e9JYHpW8yqCJj3kAE7QGK03CQ57+/v/2e9xBnDYLdRQs3YFWrSprWUQYvvKU7V vM1RQ0qU/jdMrutyps8zFtdgipaPgDYNyZaqCTtCcn+i1E7LgWrPONS8fDzpud1pLihTYGdcUGf 0twhdpsY9ii32vS1cf2Rs6nKnIZNOEOivuciEun/a7IdyaK3Y9mV3oTglb29q5fV55q0HhU9uE7 R+ygwkN1FIJ2vQDWOdA/HbEjObI8vUXvnNmB0St7RxZ2lWQf/Qq96buP4M2bVlWsQ+Ej08va2cx sSlGg7dUlkd3i4o80LatV6kBA3ZMw7kuHOMW9lcC0f0PSfm0UHd8rFvZlojP3eTxgaCFKhU3mXy rUjLfdrBk/KnmDqOoTg== X-Authority-Analysis: v=2.4 cv=FsY1OWrq c=1 sm=1 tr=0 ts=69d5d9a0 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VwQbUJbxAAAA:8 a=38kH_jgIqBUk_XIBi1EA:9 a=QEXdDO2ut3YA:10 a=zZCYzV9kfG8A:10 X-Proofpoint-ORIG-GUID: _8GFPxaJzMLUHB1nkZMtDe-oV4YzIzny X-Proofpoint-GUID: pAJage6zwfLutYcgN_oN4WMQbrdJhRpS X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-08_02,2026-04-07_05,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 priorityscore=1501 impostorscore=0 spamscore=0 phishscore=0 lowpriorityscore=0 clxscore=1011 adultscore=0 malwarescore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604010000 definitions=main-2604080036 On Wed, 11 Mar 2026 11:47:09 +0530, Shrikanth Hegde wrote: > snooze_loop is done often in any system which has fair bit of > idle time. So it qualifies for even micro-optimizations. > > When breaking the snooze due to timeout, TIF_POLLING_NRFLAG is cleared > twice. Clearing the bit invokes atomics. Avoid double clear and thereby > avoid one atomic write. > > [...] Applied to powerpc/next. [1/1] cpuidle: powerpc: avoid double clear when breaking snooze https://git.kernel.org/powerpc/c/64ed1e3e728afb57ba9acb59e69de930ead847d9 cheers