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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 DAD69C432C3 for ; Fri, 15 Nov 2019 10:39:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BAA632073B for ; Fri, 15 Nov 2019 10:39:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727486AbfKOKjV (ORCPT ); Fri, 15 Nov 2019 05:39:21 -0500 Received: from foss.arm.com ([217.140.110.172]:56870 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727022AbfKOKjV (ORCPT ); Fri, 15 Nov 2019 05:39:21 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 9479630E; Fri, 15 Nov 2019 02:39:20 -0800 (PST) Received: from e113632-lin.cambridge.arm.com (e113632-lin.cambridge.arm.com [10.1.194.37]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 235E23F534; Fri, 15 Nov 2019 02:39:19 -0800 (PST) From: Valentin Schneider To: linux-kernel@vger.kernel.org Cc: mingo@kernel.org, peterz@infradead.org, vincent.guittot@linaro.org, Dietmar.Eggemann@arm.com, tj@kernel.org, patrick.bellasi@matbug.net, surenb@google.com, qperret@google.com, Qais Yousef Subject: [PATCH v2] sched/uclamp: Fix overzealous type replacement Date: Fri, 15 Nov 2019 10:39:08 +0000 Message-Id: <20191115103908.27610-1-valentin.schneider@arm.com> X-Mailer: git-send-email 2.22.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Some uclamp helpers had their return type changed from 'unsigned int' to 'enum uclamp_id' by commit 0413d7f33e60 ("sched/uclamp: Always use 'enum uclamp_id' for clamp_id values") but it happens that some do return a value in the [0, SCHED_CAPACITY_SCALE] range, which should really be unsigned int. The affected helpers are uclamp_none(), uclamp_rq_max_value() and uclamp_eff_value(). Fix those up. Note that this doesn't lead to any obj diff using a relatively recent aarch64 compiler (8.3-2019.03). The current code of e.g. uclamp_eff_value() properly returns an 11 bit value (bits_per(1024)) and doesn't seem to do anything funny. I'm still marking this as fixing the above commit to be on the safe side. Fixes: 0413d7f33e60 ("sched/uclamp: Always use 'enum uclamp_id' for clamp_id values") Reviewed-by: Qais Yousef Signed-off-by: Valentin Schneider --- v2 changes: o Also fix uclamp_none() (Vincent) o Collect reviewed-by o Slightly reword changelog --- kernel/sched/core.c | 6 +++--- kernel/sched/sched.h | 2 +- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 513a4794ff36..3ceff1c93ef1 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -810,7 +810,7 @@ static inline unsigned int uclamp_bucket_base_value(unsigned int clamp_value) return UCLAMP_BUCKET_DELTA * uclamp_bucket_id(clamp_value); } -static inline enum uclamp_id uclamp_none(enum uclamp_id clamp_id) +static inline unsigned int uclamp_none(enum uclamp_id clamp_id) { if (clamp_id == UCLAMP_MIN) return 0; @@ -853,7 +853,7 @@ static inline void uclamp_idle_reset(struct rq *rq, enum uclamp_id clamp_id, } static inline -enum uclamp_id uclamp_rq_max_value(struct rq *rq, enum uclamp_id clamp_id, +unsigned int uclamp_rq_max_value(struct rq *rq, enum uclamp_id clamp_id, unsigned int clamp_value) { struct uclamp_bucket *bucket = rq->uclamp[clamp_id].bucket; @@ -918,7 +918,7 @@ uclamp_eff_get(struct task_struct *p, enum uclamp_id clamp_id) return uc_req; } -enum uclamp_id uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id) +unsigned int uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id) { struct uclamp_se uc_eff; diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 05c282775f21..280a3c735935 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -2300,7 +2300,7 @@ static inline void cpufreq_update_util(struct rq *rq, unsigned int flags) {} #endif /* CONFIG_CPU_FREQ */ #ifdef CONFIG_UCLAMP_TASK -enum uclamp_id uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id); +unsigned int uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id); static __always_inline unsigned int uclamp_util_with(struct rq *rq, unsigned int util, -- 2.22.0