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Mon, 27 Apr 2026 04:47:43 +0000 (GMT) Received: from smtpav04.fra02v.mail.ibm.com (smtpav04.fra02v.mail.ibm.com [10.20.54.103]) by smtprelay05.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 63R4lejv36176232 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 27 Apr 2026 04:47:40 GMT Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 785522004B; Mon, 27 Apr 2026 04:47:40 +0000 (GMT) Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D917D20040; Mon, 27 Apr 2026 04:47:38 +0000 (GMT) Received: from li-7bb28a4c-2dab-11b2-a85c-887b5c60d769.ibm.com (unknown [9.123.5.233]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 27 Apr 2026 04:47:38 +0000 (GMT) From: Shrikanth Hegde To: maddy@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, yury.norov@gmail.com, linux@rasmusvillemoes.dk, linux-kernel@vger.kernel.org Cc: sshegde@linux.ibm.com, chleroy@kernel.org Subject: [PATCH v2 4/4] powerpc/xive: Add warning if target CPU not found Date: Mon, 27 Apr 2026 10:17:15 +0530 Message-ID: <20260427044715.559137-5-sshegde@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260427044715.559137-1-sshegde@linux.ibm.com> References: <20260427044715.559137-1-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-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Authority-Analysis: v=2.4 cv=CIIamxrD c=1 sm=1 tr=0 ts=69eeea71 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=rQiant5xAKAa_VN20O8A:9 X-Proofpoint-ORIG-GUID: ct-DEGoSENUaq184Gzf2RwY2bqneYtti X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDI3MDA0OCBTYWx0ZWRfX63B1zYaVFkWG zVCU7Hf31Rm5jS6ngFu+0E6NYvUap08E7gfXvl8IT8nXBD4ba3gJig7yLvnShXr4QPoNPK9WHMC 1/yT7PIyx65wMdR47BDZIoxq/YQKDBm/Rlb8tJ9izB301QBeBqtEP9OFlLcEsHE5Tq6RDLbhsVW lmPP0c0gzkoAH2q+kOVz1VdTza7pjGq08QMVhP+5XAfImzq/v+yg8wVYkgTTvFqTYut1VFrwS+T yaKsABrI3CCrPAYlbEtqSJHwVU7aIMH0Ei/YQ/705RTzncJPbJk951AGKjDSnYf11/pREkxggEU wHEdQfvqIAu8WaME9CufdzuSez6xGIupBkZDb/wo0XCmAbPLTFOAX0cj0+h0E8SgZG1vRzYgJk3 MI1EEuxWzKbu3XeiAhsYaxxwnR3C7U+hAlnW90jIdApOFxooSdyKWceAtvujSPoG2Y4aJGdAiCQ 5pJahgS0H6TSvsaCS1w== X-Proofpoint-GUID: XzEvI7IzlX339MXnMNfejCYI_lsPsFBU 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=2026-04-27_01,2026-04-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 phishscore=0 malwarescore=0 suspectscore=0 adultscore=0 impostorscore=0 lowpriorityscore=0 clxscore=1015 bulkscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604270048 Add a warn_once to warn if the CPU target is not found. This could help to find about any such usecase. This is a very rare case, which either means mask was empty or atomic update failed for all online CPUs. So it is worth printing that path for potential fix. Signed-off-by: Shrikanth Hegde --- arch/powerpc/sysdev/xive/common.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/powerpc/sysdev/xive/common.c b/arch/powerpc/sysdev/xive/common.c index c120be73d149..dadd1f46ec93 100644 --- a/arch/powerpc/sysdev/xive/common.c +++ b/arch/powerpc/sysdev/xive/common.c @@ -564,6 +564,7 @@ static int xive_find_target_in_mask(const struct cpumask *mask, return cpu; } + WARN_ONCE(1, "target CPU not found in mask: %*pbl\n", cpumask_pr_args(mask)); return -1; } -- 2.47.3