From patchwork Mon Dec 6 12:29:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kirill A . Shutemov" X-Patchwork-Id: 12658257 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 28BFBC433EF for ; Mon, 6 Dec 2021 12:30:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243173AbhLFMdr (ORCPT ); Mon, 6 Dec 2021 07:33:47 -0500 Received: from mga09.intel.com ([134.134.136.24]:25407 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243187AbhLFMdr (ORCPT ); Mon, 6 Dec 2021 07:33:47 -0500 X-IronPort-AV: E=McAfee;i="6200,9189,10189"; a="237115321" X-IronPort-AV: E=Sophos;i="5.87,291,1631602800"; d="scan'208";a="237115321" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Dec 2021 04:30:18 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.87,291,1631602800"; d="scan'208";a="750353962" Received: from black.fi.intel.com ([10.237.72.28]) by fmsmga005.fm.intel.com with ESMTP; 06 Dec 2021 04:30:01 -0800 Received: by black.fi.intel.com (Postfix, from userid 1000) id 87464324; Mon, 6 Dec 2021 14:30:07 +0200 (EET) From: "Kirill A. Shutemov" To: rafael@kernel.org Cc: ak@linux.intel.com, bp@alien8.de, dan.j.williams@intel.com, dave.hansen@linux.intel.com, hpa@zytor.com, kirill.shutemov@linux.intel.com, knsathya@kernel.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com, rjw@rjwysocki.net, sathyanarayanan.kuppuswamy@linux.intel.com, tglx@linutronix.de, tony.luck@intel.com, x86@kernel.org Subject: [PATCH 4/4] ACPI: PM: Avoid cache flush on entering S4 Date: Mon, 6 Dec 2021 15:29:52 +0300 Message-Id: <20211206122952.74139-5-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20211206122952.74139-1-kirill.shutemov@linux.intel.com> References: <20211206122952.74139-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org According to the ACPI spec v6.4, section 16.2 the cache flushing required on entering to S1, S2, and S3. No need to flush caches on hibernation (S4). Signed-off-by: Kirill A. Shutemov --- drivers/acpi/sleep.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c index 14e8df0ac762..8166d863ed6b 100644 --- a/drivers/acpi/sleep.c +++ b/drivers/acpi/sleep.c @@ -902,8 +902,6 @@ static int acpi_hibernation_enter(void) { acpi_status status = AE_OK; - ACPI_FLUSH_CPU_CACHE(); - /* This shouldn't return. If it returns, we have a problem */ status = acpi_enter_sleep_state(ACPI_STATE_S4); /* Reprogram control registers */