From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DD4D6C433EF for ; Thu, 4 Nov 2021 23:00:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BDD6861186 for ; Thu, 4 Nov 2021 23:00:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232397AbhKDXCm (ORCPT ); Thu, 4 Nov 2021 19:02:42 -0400 Received: from mga17.intel.com ([192.55.52.151]:49613 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232347AbhKDXCe (ORCPT ); Thu, 4 Nov 2021 19:02:34 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10158"; a="212554547" X-IronPort-AV: E=Sophos;i="5.87,209,1631602800"; d="scan'208";a="212554547" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Nov 2021 15:59:55 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.87,209,1631602800"; d="scan'208";a="490138591" Received: from chang-linux-3.sc.intel.com ([172.25.66.175]) by orsmga007.jf.intel.com with ESMTP; 04 Nov 2021 15:59:55 -0700 From: "Chang S. Bae" To: linux-kernel@vger.kernel.org Cc: x86@kernel.org, tglx@linutronix.de, dave.hansen@linux.intel.com, peterz@infradead.org, bp@alien8.de, mingo@redhat.com, chang.seok.bae@intel.com Subject: [PATCH 3/4] x86/fpu: Prepare AMX state for CPU idle Date: Thu, 4 Nov 2021 15:52:25 -0700 Message-Id: <20211104225226.5031-4-chang.seok.bae@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20211104225226.5031-1-chang.seok.bae@intel.com> References: <20211104225226.5031-1-chang.seok.bae@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Before entering CPU idle, make sure large registers such as AMX TILE are initialized. Otherwise, non-initialized register states may prevent a CPU from entering a deeper low-power state. Suggested-by: Dave Hansen Signed-off-by: Chang S. Bae Cc: x86@kernel.org Cc: linux-kernel@vger.kernel.org --- arch/x86/kernel/process.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index eb470be0e5ae..7044ba276064 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -707,6 +707,7 @@ static inline void play_dead(void) void arch_cpu_idle_enter(void) { + fpu_idle_fpregs(); tsc_verify_tsc_adjust(false); local_touch_nmi(); } -- 2.17.1