From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 516B845A291; Tue, 21 Jul 2026 21:58:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784671105; cv=none; b=gn9KUKmEqslU+mVrzEPR5Lf6l0mH9Q9l48p+zAjDE/0I9BjH5PMZJQYdzZajr16UjrGpYY7ncm2wR5ljFb83D+dEinmhcd/sCqP8ufPRMNz4ek0kBIJRfEURhPgyoIebq7JfhxRapCpwGvKsrhlH0ZGzDX2XQLcKGQdnipGeA2Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784671105; c=relaxed/simple; bh=BIkE0DNgH2Mo9/9BiuluY98/9ueQk/i2TLNAW31iMCU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=tzv9BABQTgEHfinnVfAaZafbA6UYF10vzmSJoFEY2EG0QoeweBuU514GopsSZDR3OHX3KFRYRDu4tsOCIfZydSOnMtyGxpMijhkC2Pi6cABmdTuORFUug3NSPGxdYwusfTtiboU/Cjbe3y7+BwJjfo+tYWaIu5EW/oPXxiv6eAo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=AnaH8oVX; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="AnaH8oVX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1DF9D1F00A3A; Tue, 21 Jul 2026 21:58:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784671095; bh=Fe5/pB/ws+vJjm0o2TlHyAPpx48ekLo86Z88v5ZV2R8=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=AnaH8oVXdEIif8AzQSIP46DvHVSgjqh4HgKTdPSyWWPwjBRVAi6QfIntaQ8VYAII6 zH1tv3Yo0Hd4bMVdocE2OPFZbAOr9hEub2OqVoExANinMlulKxk8CgAtjxrGOyYDNO HIs/PSNPMlNs/QCgkkZPF5HP1A+Mx4i7PDKoMBns= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Srinivas Pandruvada , Fushuai Wang , "Rafael J. Wysocki" Subject: [PATCH 5.15 116/843] cpufreq: intel_pstate: Sync policy->cur during CPU offline Date: Tue, 21 Jul 2026 17:15:51 +0200 Message-ID: <20260721152408.614059110@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152405.946368001@linuxfoundation.org> References: <20260721152405.946368001@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Fushuai Wang commit bcbdaa1086c25a8a5d48e04e1b82fdfb0682b681 upstream. When a CPU goes offline with HWP disabled, intel_pstate_set_min_pstate() sets the MSR_IA32_PERF_CTL to minimum frequency to prevent SMT siblings from being restricted. However, the policy->cur value was not updated, leaving it at the previous value. When the CPU comes back online, governor->limits() checks if target_freq equals policy->cur and skips the frequency adjustment if they match. Since policy->cur still holds the previous value, the governor does not call cpufreq_driver->target to update MSR_IA32_PERF_CTL. Fix this by synchronizing policy->cur with the hardware state when setting minimum pstate during CPU offline. Fixes: bb18008f8086 ("intel_pstate: Set core to min P state during core offline") Cc: stable@vger.kernel.org # 3.15+ Suggested-by: Srinivas Pandruvada Signed-off-by: Fushuai Wang [ rjw: Subject refinement ] Link: https://patch.msgid.link/20260520032119.30615-1-fushuai.wang@linux.dev Signed-off-by: Rafael J. Wysocki Signed-off-by: Greg Kroah-Hartman --- drivers/cpufreq/intel_pstate.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -2498,10 +2498,12 @@ static int intel_cpufreq_cpu_offline(str * from getting to lower performance levels, so force the minimum * performance on CPU offline to prevent that from happening. */ - if (hwp_active) + if (hwp_active) { intel_pstate_hwp_offline(cpu); - else + } else { intel_pstate_set_min_pstate(cpu); + policy->cur = cpu->pstate.min_freq; + } intel_pstate_exit_perf_limits(policy);