linux-kernel - Re: [PATCH 5.10+5.4 2/3] sched/topology: Fix sched_domain_topology_level alloc in sched_init

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Date:   Sat, 05 Mar 2022 09:25:03 -0800
From:   Joe Perches <joe@...ches.com>
To:     dann frazier <dann.frazier@...onical.com>, stable@...r.kernel.org
Cc:     Miao Xie <miaox@...fujitsu.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Barry Song <song.bao.hua@...ilicon.com>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Sergei Trofimovich <slyfox@...too.org>,
        Anatoly Pugachev <matorola@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5.10+5.4 2/3] sched/topology: Fix
 sched_domain_topology_level alloc in sched_init_numa()

On Sat, 2022-03-05 at 09:13 -0800, Joe Perches wrote:
> On Sat, 2022-03-05 at 09:44 -0700, dann frazier wrote:
> > From: Dietmar Eggemann <dietmar.eggemann@....com>
> > 
> > commit 71e5f6644fb2f3304fcb310145ded234a37e7cc1 upstream.
> > 
> > Commit "sched/topology: Make sched_init_numa() use a set for the
> > deduplicating sort" allocates 'i + nr_levels (level)' instead of
> > 'i + nr_levels + 1' sched_domain_topology_level.
> []
> > diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
> []
> > @@ -1655,7 +1655,7 @@ void sched_init_numa(void)
> >  	/* Compute default topology size */
> >  	for (i = 0; sched_domain_topology[i].mask; i++);
> 
> Thanks.

Oops.  Didn't notice this was for a stable backport.