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

[Chen, Yu C]

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