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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 50F27CE79CE for ; Wed, 20 Sep 2023 12:37:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236031AbjITMh5 (ORCPT ); Wed, 20 Sep 2023 08:37:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52770 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236027AbjITMhw (ORCPT ); Wed, 20 Sep 2023 08:37:52 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5624392 for ; Wed, 20 Sep 2023 05:37:46 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A112BC433C9; Wed, 20 Sep 2023 12:37:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1695213466; bh=5TJk3nsrvYx/dI934kKu+QBoEttnuiPGUvIKP/oHGTg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=No6Wt4rOuXzFHOutmXQC73VR38wmWFCptKslq5/VNIkY3ZXGHIJirALcpEgdWc+qC jZQCyG2u3l+NnrFP/jBa33p2QcLzNXf3mNk3blxGcqDytwgtmlz+tVuxa216r6iAIB p1Tb7r9yL8owaSgWTT9CzXsS1YO+oZS5XGV542Zo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Helge Deller Subject: [PATCH 5.4 248/367] parisc: led: Reduce CPU overhead for disk & lan LED computation Date: Wed, 20 Sep 2023 13:30:25 +0200 Message-ID: <20230920112904.972862261@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230920112858.471730572@linuxfoundation.org> References: <20230920112858.471730572@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Helge Deller commit 358ad816e52d4253b38c2f312e6b1cbd89e0dbf7 upstream. Older PA-RISC machines have LEDs which show the disk- and LAN-activity. The computation is done in software and takes quite some time, e.g. on a J6500 this may take up to 60% time of one CPU if the machine is loaded via network traffic. Since most people don't care about the LEDs, start with LEDs disabled and just show a CPU heartbeat LED. The disk and LAN LEDs can be turned on manually via /proc/pdc/led. Signed-off-by: Helge Deller Cc: Signed-off-by: Greg Kroah-Hartman --- drivers/parisc/led.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/parisc/led.c +++ b/drivers/parisc/led.c @@ -56,8 +56,8 @@ static int led_type __read_mostly = -1; static unsigned char lastleds; /* LED state from most recent update */ static unsigned int led_heartbeat __read_mostly = 1; -static unsigned int led_diskio __read_mostly = 1; -static unsigned int led_lanrxtx __read_mostly = 1; +static unsigned int led_diskio __read_mostly; +static unsigned int led_lanrxtx __read_mostly; static char lcd_text[32] __read_mostly; static char lcd_text_default[32] __read_mostly; static int lcd_no_led_support __read_mostly = 0; /* KittyHawk doesn't support LED on its LCD */