From nobody Fri Dec 19 18:00:01 2025 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 85FAEC4332F for ; Mon, 14 Nov 2022 11:46:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236726AbiKNLqh (ORCPT ); Mon, 14 Nov 2022 06:46:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42322 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236332AbiKNLqC (ORCPT ); Mon, 14 Nov 2022 06:46:02 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B5D3DA473 for ; Mon, 14 Nov 2022 03:44:59 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 53F4C6106E for ; Mon, 14 Nov 2022 11:44:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AAD94C43146; Mon, 14 Nov 2022 11:44:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1668426298; bh=s+opGJ7QoOGk4sclN8NLpDopS2NNvFfrwRO9izFas60=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PJ6WVKuI/QgsSuRDFCKOvAO0uUM0gU8psBNgN+vVzgutS5/SEveoHFBC8sti98ChE 21raGHbXdg1YvVHO1pwKMyCQ79tbvGbCsBATj5YZM6qdlZV07GqGvxGZAfw/B3kQsg MoY8iU5jOKJpwYVBSP2fgzkJWa3naU5SYi95ul/KKOTG3T2MMcmJbV/UetvmyFR4rO kyxdeQEndDY9ETWR1hlki3J3//BGzIO3tD1UvsGblsDOUbFQwl2QvsSt2BVK+tZpzQ Q+EvDa4orxePuIVGvDuJ9hFPzjoUk703JRBFaCQTbyKRTCU67lhK9dSnEcv9pb+Fo1 UJ+XyfhxOgjRg== From: "Jiri Slaby (SUSE)" To: linux-kernel@vger.kernel.org Cc: Andi Kleen , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Valentin Schneider , Andi Kleen , Martin Liska , Jiri Slaby Subject: [PATCH 25/46] sched, lto: mark sched classes as __noreorder Date: Mon, 14 Nov 2022 12:43:23 +0100 Message-Id: <20221114114344.18650-26-jirislaby@kernel.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221114114344.18650-1-jirislaby@kernel.org> References: <20221114114344.18650-1-jirislaby@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Andi Kleen The scheduler code assumes that the scheduler classes are in a particular order in memory. gcc LTO can violate this. Specify __noreorder to avoid a boot BUG(). Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Juri Lelli Cc: Vincent Guittot Cc: Dietmar Eggemann Cc: Steven Rostedt Cc: Ben Segall Cc: Mel Gorman Cc: Daniel Bristot de Oliveira Cc: Valentin Schneider Signed-off-by: Andi Kleen Signed-off-by: Martin Liska Signed-off-by: Jiri Slaby --- kernel/sched/sched.h | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index a4a20046e586..fe2703528972 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -2230,6 +2230,7 @@ static inline void set_next_task(struct rq *rq, struc= t task_struct *next) */ #define DEFINE_SCHED_CLASS(name) \ const struct sched_class name##_sched_class \ + __noreorder \ __aligned(__alignof__(struct sched_class)) \ __section("__" #name "_sched_class") =20 --=20 2.38.1