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Date: Mon, 10 Jan 2022 23:46:15 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Xiu Jianfeng <xiujianfeng@...wei.com> Cc: mingo@...hat.com, juri.lelli@...hat.com, vincent.guittot@...aro.org, dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de, bristot@...hat.com, gustavoars@...nel.org, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: Re: [PATCH -next, v2] sched: Use struct_size() helper in task_numa_group() On Mon, Jan 10, 2022 at 09:23:54AM +0800, Xiu Jianfeng wrote: > Make use of struct_size() helper instead of an open-coded calculation. > There is no functional change in this patch. > > Link: https://github.com/KSPP/linux/issues/160 > Signed-off-by: Xiu Jianfeng <xiujianfeng@...wei.com> > --- > kernel/sched/fair.c | 5 ++--- > 1 file changed, 2 insertions(+), 3 deletions(-) > > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c > index 095b0aa378df..af933a7f9e5d 100644 > --- a/kernel/sched/fair.c > +++ b/kernel/sched/fair.c > @@ -2437,9 +2437,8 @@ static void task_numa_group(struct task_struct *p, int cpupid, int flags, > int i; > > if (unlikely(!deref_curr_numa_group(p))) { > - unsigned int size = sizeof(struct numa_group) + > - NR_NUMA_HINT_FAULT_STATS * > - nr_node_ids * sizeof(unsigned long); > + unsigned int size = struct_size(grp, faults, > + NR_NUMA_HINT_FAULT_STATS * nr_node_ids); Again, why?! The old code was perfectly readable, this, not so much.
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