From nobody Thu Dec 18 10:50:03 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 4DEF018DF73; Wed, 4 Dec 2024 20:39:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733344783; cv=none; b=r+R+6jveGFYZRdY36YvU3da7HwBlKoTVcSCNaORs/lU4Wmb0eupVsEtD8Ps2lOUXUZDBsew0YGbsek4NtGvHXdlzDAkrz0z7w+2dAcMFCK6jAE5Hx9z8fMTss4vonTQPcVPJCFWdN8LdmcpsrMcAMg2SWmm/ngmvyUSMWVnjNok= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733344783; c=relaxed/simple; bh=pDdiHbg7YMuFBhEeFOZq5ZIOiaHXKRONzeydujOerIA=; h=Date:From:To:Subject:Cc:MIME-Version:Message-ID:Content-Type; b=oK4gI+5PdMaHI3P+FO86ehnMfEqFtSf7XY+1ilrQwMEw3IUZyP/NaWbTXudKYEj21+fzcJycFycbODlG/lLOUzoohAFcB7Zfl/b9jDPu+FQEBhEERJ99wjteJ/AQcDtelkjH+UzN7qvRyawcSsoPIfujsfIs/aIXW3uiUbsz1i0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=4tf4BXTQ; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=Zqgnsyej; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="4tf4BXTQ"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="Zqgnsyej" Date: Wed, 04 Dec 2024 20:39:37 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1733344778; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=viqr1gJdUvq+kXsW3fBrILOLRWZvrsguOYnVoxewpKw=; b=4tf4BXTQyl5ddbUCS0QiCrvbUtEIEgtv1Rf4qCbSwgZxg8I9Y9MwtIpnF8a3EePSL+4y1R VgHALKgiFbM73ceS8/17Da0ctPsCJjMrLmXEKievyst23EpzU2MvN06c9nRL1mKS6fNrmu 7R7jcGiIB0IA1P3GrvYGqSEG5G2Cyp9Q9CsdO/tD9iE3HjdHMJCT3hbOvmEJOm//zpGcNy 6M46azSded5rOK+ZWkXCqHOaoxnwHb/YrOI17DWJaGhltWAfqRM9qiboA8dmn9MAJA1zgR mk62BhLKePuw8yXzSoGZhCeUmip1eK6jg0jxaUx/xCU36rM2s3g+DECOxmNYrw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1733344778; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=viqr1gJdUvq+kXsW3fBrILOLRWZvrsguOYnVoxewpKw=; b=Zqgnsyej0B8adR6DIzZL92Q1zikcmdqc421IxYv/ovW2dn2dP3H8FgwFRxaPoXFQZSNOln LDCrK8RL26g6jFAA== From: "tip-bot2 for Len Brown" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/urgent] x86/cpu: Add Lunar Lake to list of CPUs with a broken MONITOR implementation Cc: Len Brown , Dave Hansen , "Rafael J. Wysocki" , stable@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <173334477712.412.14806732426864874461.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Precedence: bulk Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable The following commit has been merged into the x86/urgent branch of tip: Commit-ID: c9a4b55431e5220347881e148725bed69c84e037 Gitweb: https://git.kernel.org/tip/c9a4b55431e5220347881e148725bed69= c84e037 Author: Len Brown AuthorDate: Tue, 12 Nov 2024 21:07:00 -05:00 Committer: Dave Hansen CommitterDate: Wed, 04 Dec 2024 12:30:14 -08:00 x86/cpu: Add Lunar Lake to list of CPUs with a broken MONITOR implementation Under some conditions, MONITOR wakeups on Lunar Lake processors can be lost, resulting in significant user-visible delays. Add Lunar Lake to X86_BUG_MONITOR so that wake_up_idle_cpu() always sends an IPI, avoiding this potential delay. Reported originally here: https://bugzilla.kernel.org/show_bug.cgi?id=3D219364 [ dhansen: tweak subject ] Signed-off-by: Len Brown Signed-off-by: Dave Hansen Reviewed-by: Rafael J. Wysocki Cc:stable@vger.kernel.org Link: https://lore.kernel.org/all/a4aa8842a3c3bfdb7fe9807710eef159cbf0e705.= 1731463305.git.len.brown%40intel.com --- arch/x86/kernel/cpu/intel.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c index d1de300..8ded9f8 100644 --- a/arch/x86/kernel/cpu/intel.c +++ b/arch/x86/kernel/cpu/intel.c @@ -555,7 +555,9 @@ static void init_intel(struct cpuinfo_x86 *c) c->x86_vfm =3D=3D INTEL_WESTMERE_EX)) set_cpu_bug(c, X86_BUG_CLFLUSH_MONITOR); =20 - if (boot_cpu_has(X86_FEATURE_MWAIT) && c->x86_vfm =3D=3D INTEL_ATOM_GOLDM= ONT) + if (boot_cpu_has(X86_FEATURE_MWAIT) && + (c->x86_vfm =3D=3D INTEL_ATOM_GOLDMONT || + c->x86_vfm =3D=3D INTEL_LUNARLAKE_M)) set_cpu_bug(c, X86_BUG_MONITOR); =20 #ifdef CONFIG_X86_64