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 X-Spam-Level: X-Spam-Status: No, score=-3.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 87E99C32754 for ; Thu, 1 Aug 2019 11:18:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 51A952087E for ; Thu, 1 Aug 2019 11:18:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="S2iVsB9T" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730592AbfHALSZ (ORCPT ); Thu, 1 Aug 2019 07:18:25 -0400 Received: from merlin.infradead.org ([205.233.59.134]:50870 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730447AbfHALSX (ORCPT ); Thu, 1 Aug 2019 07:18:23 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=Content-Type:MIME-Version:References: Subject:Cc:To:From:Date:Message-Id:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=Ts7Wuhwdp6RUU0lWUdro44IST7FhRZuEKkrJRN/QhKM=; b=S2iVsB9TvL3c2A0C6BVu99iu8C M4CYn3OLGZe/Kq2Z3wvLAEiNZiQdCq25GSXPjnY3goThBuRPh/1OOeNWTWG/JbG2FUKzGV3A0su4U MraCsCcc+ZLreEhvH2+hg9GTVv1YN9BzFbP2RlYSM/LoMTmkhjMOUjErl7rPWyyF6aljEusK4HKZz A814rOmCbId28UB+7qzPIBg/EtNIpAYMe/iJ2bKu4WDNIF1pc4OEz5wwA2sgyPZak8KEoF55VxaVg kbINHdxSoCP9mXEns/GU9+dneG35Ys9fn+it/VTzNa1zGwH1aZBtx/vC47CMV5pUKogy104q4LPxt F2OqzPrw==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1ht968-0005fe-Ie; Thu, 01 Aug 2019 11:18:16 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id 8E421202975E5; Thu, 1 Aug 2019 13:18:12 +0200 (CEST) Message-Id: <20190801111541.917256884@infradead.org> User-Agent: quilt/0.65 Date: Thu, 01 Aug 2019 13:13:53 +0200 From: Peter Zijlstra To: mingo@kernel.org Cc: linux-kernel@vger.kernel.org, peterz@infradead.org, Benson Leung , Enric Balletbo i Serra , Guenter Roeck , Mark Brown , linux-spi@vger.kernel.org Subject: [PATCH 5/5] spi: Reduce kthread priority References: <20190801111348.530242235@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The SPI thingies request FIFO-99 by default, reduce this to FIFO-50. FIFO-99 is the very highest priority available to SCHED_FIFO and it not a suitable default; it would indicate the SPI work is the most important work on the machine. Cc: Benson Leung Cc: Enric Balletbo i Serra Cc: Guenter Roeck Cc: Mark Brown Cc: linux-spi@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Peter Zijlstra (Intel) --- drivers/platform/chrome/cros_ec_spi.c | 2 +- drivers/spi/spi.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) --- a/drivers/platform/chrome/cros_ec_spi.c +++ b/drivers/platform/chrome/cros_ec_spi.c @@ -706,7 +706,7 @@ static int cros_ec_spi_devm_high_pri_all struct cros_ec_spi *ec_spi) { struct sched_param sched_priority = { - .sched_priority = MAX_RT_PRIO - 1, + .sched_priority = MAX_RT_PRIO / 2, }; int err; --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1434,7 +1434,7 @@ static void spi_pump_messages(struct kth */ static void spi_set_thread_rt(struct spi_controller *ctlr) { - struct sched_param param = { .sched_priority = MAX_RT_PRIO - 1 }; + struct sched_param param = { .sched_priority = MAX_RT_PRIO / 2 }; dev_info(&ctlr->dev, "will run message pump with realtime priority\n");