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 813705A79B; Thu, 16 Jul 2026 14:09:17 +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=1784210958; cv=none; b=pShHzbSYwWsUMW1rFW/PzKd6XMsfcausf++qZ1OMJVnfynPvu3p/X0Hs+qf1eEdr3x3faTejhB82v7U3KX9ji6MiOOmRprglqzWPMPR75wIFvAC9r0Tsu+rVshewB/cTTwDdigfG1ALi9Vzci2tCx2pF0RYoI6azohCM7S3v8TE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784210958; c=relaxed/simple; bh=VaFe5bFxAMcAf8evWFY9F1SVqfEuFZOW9uKd/5bZk90=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=USXqjA4cLBeIayb8XRrHD7F25oJ8zc9tB6uyUMZE4JSa41d6Po2Brw3RmR1omUjWdq76MD2CVd24KzlKfTPVVJUYpkBbTpeqaD8L7cTI/hh2LVSTViR9TW5PwYavn6yuhioxxCx7ew0DdudNqhCOof1rrycNYB2NVZhNGmcxi7g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Jtp1S8rh; 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="Jtp1S8rh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A8BCC1F000E9; Thu, 16 Jul 2026 14:09:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784210957; bh=G+OUg+AMNEF/YBJU2h+guUYbu9pKYS9X2dh9rVv/if4=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Jtp1S8rhWyVmZEcuI5gOOJevghKKEAzQhceGTuwVzwF+sE0xsTsuWlWdF9CVjxuRZ EalsPOlj0Vb8ex61EPBrxqgM7GTzsY7ZSx3ayg/t1+L1I2uoqjb4nA875Q09Norj5s lz5MXKtO6/tt2+L/MziQJa+C2rNen+rW5hfm6E9U= 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 6.18 246/480] cpufreq: intel_pstate: Sync policy->cur during CPU offline Date: Thu, 16 Jul 2026 15:29:53 +0200 Message-ID: <20260716133050.140112005@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260716133044.672218725@linuxfoundation.org> References: <20260716133044.672218725@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 6.18-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 @@ -3016,10 +3016,12 @@ 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);