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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 7D109C9DD4C for ; Tue, 27 Oct 2020 15:43:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 39EE22244C for ; Tue, 27 Oct 2020 15:43:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603813435; bh=ti2uUD7y8JK7z/Qrbr8pZjU5CCvqvOgHrxGfdQhwlg4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=CIcqrpks/E0eW62DQJbq/8XcGOJRRUpKA+vIeYE30+cEcVetI8Pip1mVH91wnC4ae D86hf6VeKMZeNg0TRQsR+V7NtgiWjmBtN/WgRrvLYdI97CJ+AfRXrECNi4pS2Vxqc0 VVk//OIucm/DbsCPIeVUyhP5JSWSwfKhY07bS7Ac= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1795712AbgJ0PPT (ORCPT ); Tue, 27 Oct 2020 11:15:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:48120 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1794482AbgJ0PMD (ORCPT ); Tue, 27 Oct 2020 11:12:03 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 81B4420657; Tue, 27 Oct 2020 15:12:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603811523; bh=ti2uUD7y8JK7z/Qrbr8pZjU5CCvqvOgHrxGfdQhwlg4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xhCeiQ4ws0WmQeVtcadoFPXuZ5PCFZC6hdpP6TJW4r9sqXFZ8i3/PFQ0Hb/VKmt2W oo6vVFlZEX61ORCWXEXoPI+Fvm0g/WfvJ/GWmQechat7L5dMd9l3CcJJL8BR8TNyzb lfot9/VRKGCmrK0av9Ys39BJZamUgPfGJwB/THdE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Daniel Bristot de Oliveira , Juri Lelli , Ingo Molnar , Patrick Bellasi , Valentin Schneider , Sasha Levin Subject: [PATCH 5.8 524/633] sched/features: Fix !CONFIG_JUMP_LABEL case Date: Tue, 27 Oct 2020 14:54:27 +0100 Message-Id: <20201027135547.352495958@linuxfoundation.org> X-Mailer: git-send-email 2.29.1 In-Reply-To: <20201027135522.655719020@linuxfoundation.org> References: <20201027135522.655719020@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Juri Lelli [ Upstream commit a73f863af4ce9730795eab7097fb2102e6854365 ] Commit: 765cc3a4b224e ("sched/core: Optimize sched_feat() for !CONFIG_SCHED_DEBUG builds") made sched features static for !CONFIG_SCHED_DEBUG configurations, but overlooked the CONFIG_SCHED_DEBUG=y and !CONFIG_JUMP_LABEL cases. For the latter echoing changes to /sys/kernel/debug/sched_features has the nasty effect of effectively changing what sched_features reports, but without actually changing the scheduler behaviour (since different translation units get different sysctl_sched_features). Fix CONFIG_SCHED_DEBUG=y and !CONFIG_JUMP_LABEL configurations by properly restructuring ifdefs. Fixes: 765cc3a4b224e ("sched/core: Optimize sched_feat() for !CONFIG_SCHED_DEBUG builds") Co-developed-by: Daniel Bristot de Oliveira Signed-off-by: Daniel Bristot de Oliveira Signed-off-by: Juri Lelli Signed-off-by: Ingo Molnar Acked-by: Patrick Bellasi Reviewed-by: Valentin Schneider Link: https://lore.kernel.org/r/20201013053114.160628-1-juri.lelli@redhat.com Signed-off-by: Sasha Levin --- kernel/sched/core.c | 2 +- kernel/sched/sched.h | 13 ++++++++++--- 2 files changed, 11 insertions(+), 4 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index f788cd61df212..1c68621743ac2 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -39,7 +39,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(sched_overutilized_tp); DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues); -#if defined(CONFIG_SCHED_DEBUG) && defined(CONFIG_JUMP_LABEL) +#ifdef CONFIG_SCHED_DEBUG /* * Debugging: various feature bits * diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index c82857e2e288a..0b1485ac19c4e 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1600,7 +1600,7 @@ enum { #undef SCHED_FEAT -#if defined(CONFIG_SCHED_DEBUG) && defined(CONFIG_JUMP_LABEL) +#ifdef CONFIG_SCHED_DEBUG /* * To support run-time toggling of sched features, all the translation units @@ -1608,6 +1608,7 @@ enum { */ extern const_debug unsigned int sysctl_sched_features; +#ifdef CONFIG_JUMP_LABEL #define SCHED_FEAT(name, enabled) \ static __always_inline bool static_branch_##name(struct static_key *key) \ { \ @@ -1620,7 +1621,13 @@ static __always_inline bool static_branch_##name(struct static_key *key) \ extern struct static_key sched_feat_keys[__SCHED_FEAT_NR]; #define sched_feat(x) (static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x])) -#else /* !(SCHED_DEBUG && CONFIG_JUMP_LABEL) */ +#else /* !CONFIG_JUMP_LABEL */ + +#define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x)) + +#endif /* CONFIG_JUMP_LABEL */ + +#else /* !SCHED_DEBUG */ /* * Each translation unit has its own copy of sysctl_sched_features to allow @@ -1636,7 +1643,7 @@ static const_debug __maybe_unused unsigned int sysctl_sched_features = #define sched_feat(x) !!(sysctl_sched_features & (1UL << __SCHED_FEAT_##x)) -#endif /* SCHED_DEBUG && CONFIG_JUMP_LABEL */ +#endif /* SCHED_DEBUG */ extern struct static_key_false sched_numa_balancing; extern struct static_key_false sched_schedstats; -- 2.25.1