linux-kernel - Re: [tip:sched/core] [sched/smp] 06ddd17521: BUG:using_smp_processor_id()in

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Message-ID: <20250710081114.5wnABNG7@linutronix.de>
Date: Thu, 10 Jul 2025 10:11:14 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: "Chen, Yu C" <yu.c.chen@...el.com>
Cc: kernel test robot <oliver.sang@...el.com>,
	Ingo Molnar <mingo@...nel.org>, oe-lkp@...ts.linux.dev,
	lkp@...el.com, linux-kernel@...r.kernel.org, x86@...nel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Juri Lelli <juri.lelli@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Shrikanth Hegde <sshegde@...ux.ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Valentin Schneider <vschneid@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	aubrey.li@...ux.intel.com
Subject: Re: [tip:sched/core] [sched/smp] 06ddd17521:
 BUG:using_smp_processor_id()in_preemptible

On 2025-07-10 16:00:46 [+0800], Chen, Yu C wrote:
> migrate_disable() disables the task migration between CPUs by restricting
> the task's affinity, but it does not disable the preemption on single
> CPUs IMO. The scope of guard(preempt)() in migrate_disable() is just
> within the migrate_disable(). debug_smp_processor_id() warns when the
> preemption is enabled.

does migrate_disable() really have no effect on
debug_smp_processor_id()?

> Thanks,
> Chenyu
Sebastian