linux-kernel - Re: [RFC PATCH v4 23/28] sched: Scan a task's preferred node for preferred LLC

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Message-ID: <9c38cc6e-9105-4326-82fd-417d2e67074e@intel.com>
Date: Tue, 12 Aug 2025 11:36:53 +0800
From: "Chen, Yu C" <yu.c.chen@...el.com>
To: kernel test robot <oliver.sang@...el.com>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, Jianyong Wu
	<jianyong.wu@...look.com>, Shrikanth Hegde <sshegde@...ux.ibm.com>, Tim Chen
	<tim.c.chen@...ux.intel.com>, <linux-kernel@...r.kernel.org>,
	<aubrey.li@...ux.intel.com>, Peter Zijlstra <peterz@...radead.org>, "Ingo
 Molnar" <mingo@...hat.com>, K Prateek Nayak <kprateek.nayak@....com>,
	"Gautham R . Shenoy" <gautham.shenoy@....com>, Vincent Guittot
	<vincent.guittot@...aro.org>, Juri Lelli <juri.lelli@...hat.com>, "Dietmar
 Eggemann" <dietmar.eggemann@....com>, Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>, "Valentin
 Schneider" <vschneid@...hat.com>, Libo Chen <libo.chen@...cle.com>, "Madadi
 Vineeth Reddy" <vineethr@...ux.ibm.com>, Hillf Danton <hdanton@...a.com>,
	Yangyu Chen <cyy@...self.name>, Tingyin Duan <tingyin.duan@...il.com>, "Vern
 Hao" <vernhao@...cent.com>, Len Brown <len.brown@...el.com>, Aubrey Li
	<aubrey.li@...el.com>, Zhao Liu <zhao1.liu@...el.com>, Chen Yu
	<yu.chen.surf@...il.com>
Subject: Re: [RFC PATCH v4 23/28] sched: Scan a task's preferred node for
 preferred LLC

On 8/12/2025 9:59 AM, kernel test robot wrote:
> 
> 
> [   19.177186][   T64] BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/64
> [ 19.179622][ T64] caller is debug_smp_processor_id (lib/smp_processor_id.c:61)
> [   19.181347][   T64] CPU: 0 UID: 0 PID: 64 Comm: modprobe Not tainted 6.16.0-00023-gff797757d658 #1 PREEMPT(none)
> [   19.181372][   T64] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
> [   19.181385][   T64] Call Trace:
> [   19.181391][   T64]  <TASK>
> [ 19.181401][ T64] dump_stack_lvl (lib/dump_stack.c:123)
> [ 19.181440][ T64] dump_stack (lib/dump_stack.c:130)
> [ 19.181465][ T64] check_preemption_disabled (arch/x86/include/asm/preempt.h:85 lib/smp_processor_id.c:53)
> [ 19.181494][ T64] debug_smp_processor_id (lib/smp_processor_id.c:61)
> [ 19.181514][ T64] task_cache_work (kernel/sched/fair.c:1422)

Thanks for the report, will use get_cpu() in next version.

thanks,
Chenyu