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 A005943634C; Tue, 21 Jul 2026 20:19:32 +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=1784665173; cv=none; b=uW3WkOZz8KPIcIcE2/ASirS0K56juaWVazQqXx2N8g2SwtAzcMnuZAw+T2XGtPhoMIrlh4xicbqz0CAKQOauHyJ4F/zfpYqcYEtJr7iucRJlM3LSxTFuDTSDVhOzCOzq/cAZXuRG8869mxaGC4LeprbGxXnp27VbKVcO4zz2HLo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784665173; c=relaxed/simple; bh=LPGoyadAgx3l6bgoEIvr+eVJa8pkTPn5UKq0iifH+AI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=oKq8RkgrINq+RUxBUWfw8jsRhC/+gEV0hhJ9UDVJNhJpoTaLeoAS76+UfpUJYaRfLuxFFD9oCqoNsTbFC5SN2zIqmlZ1t8ZhNk4BWR0D3eWIByWARxijBxV3aMdlB4ShlplUbeuX0CnP6nh04BfvwgDBCR/zBY2m/dB9eJxD5ME= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=F1UYLyuB; 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="F1UYLyuB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BDF501F000E9; Tue, 21 Jul 2026 20:19:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784665172; bh=H3y9PRJe1EDT9UOzvZOma+4B8dkQDNsCXsKAlCKkxdg=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=F1UYLyuBRHf/7lbxa1SBhy+TQarsZAIx06W54IRZGtlr4hkfhvJLh6YMlgq/oSD15 QH8EMkbTpqs9z2HNyaMhTU2EeTLfB4b3OmzI2lHvipOarjwjNIYR3QqlkojbRMR0b3 K3sQujIZv3WtrbI+3RuAHsiS6kzjP+DgoKZ6JxzI= 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 6.6 0204/1266] cpufreq: intel_pstate: Sync policy->cur during CPU offline Date: Tue, 21 Jul 2026 17:10:41 +0200 Message-ID: <20260721152446.377933968@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152441.786066624@linuxfoundation.org> References: <20260721152441.786066624@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 6.6-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 @@ -2666,10 +2666,12 @@ 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);