linux-kernel - Re: [PATCH v01] sched/core: uclamp: fix rq.uclamp memory size of initialization

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Date:   Tue, 7 Jan 2020 10:47:56 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Qais Yousef <qais.yousef@....com>
Cc:     Li Guanglei <guangleix.li@...il.com>, mingo@...hat.com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, linux-kernel@...r.kernel.org,
        guanglei.li@...soc.com
Subject: Re: [PATCH v01] sched/core: uclamp: fix rq.uclamp memory size of
 initialization

On Sun, Dec 29, 2019 at 10:11:20PM +0000, Qais Yousef wrote:
> On 12/25/19 15:44, Li Guanglei wrote:
> > From: Li Guanglei <guanglei.li@...soc.com>
> > 
> > uclamp_rq for each clamp id(UCLAMP_CNT) should be initialized when call
> 
> s/clamp id(UCLAMP_CNT)/UCLAMP_CNT/
> 
> > init_uclamp.
> > 
> > Signed-off-by: Li Guanglei <guanglei.li@...soc.com>
> 
> This need fixes tag
> 
> Fixes: 69842cba9ace ("sched/uclamp: Add CPU's clamp buckets refcountinga")
> 
> Otherwise this looks good to me.
> 
> Reviewed-by: Qais Yousef <qais.yousef@....com>

Thanks! It now looks something like so:

---
Subject: sched/core: Fix size of rq::uclamp initialization
From: Li Guanglei <guanglei.li@...soc.com>
Date: Wed, 25 Dec 2019 15:44:04 +0800

rq::uclamp is an array of struct uclamp_rq, make sure we clear the
whole thing.

Fixes: 69842cba9ace ("sched/uclamp: Add CPU's clamp buckets refcountinga")
Signed-off-by: Li Guanglei <guanglei.li@...soc.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Qais Yousef <qais.yousef@....com>
Link: https://lkml.kernel.org/r/1577259844-12677-1-git-send-email-guangleix.li@gmail.com
---
 kernel/sched/core.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1253,7 +1253,8 @@ static void __init init_uclamp(void)
 	mutex_init(&uclamp_mutex);
 
 	for_each_possible_cpu(cpu) {
-		memset(&cpu_rq(cpu)->uclamp, 0, sizeof(struct uclamp_rq));
+		memset(&cpu_rq(cpu)->uclamp, 0,
+				sizeof(struct uclamp_rq)*UCLAMP_CNT);
 		cpu_rq(cpu)->uclamp_flags = 0;
 	}