This is a note to let you know that I've just added the patch titled soc: fsl: dpio: replace smp_processor_id with raw_smp_processor_id to the 5.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: soc-fsl-dpio-replace-smp_processor_id-with-raw_smp_processor_id.patch and it can be found in the queue-5.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From e775eb9fc2a4107f03222fa48bc95c2c82427e64 Mon Sep 17 00:00:00 2001 From: Meng Li <Meng.Li@xxxxxxxxxxxxx> Date: Tue, 19 Oct 2021 10:32:41 +0800 Subject: soc: fsl: dpio: replace smp_processor_id with raw_smp_processor_id From: Meng Li <Meng.Li@xxxxxxxxxxxxx> commit e775eb9fc2a4107f03222fa48bc95c2c82427e64 upstream. When enable debug kernel configs,there will be calltrace as below: BUG: using smp_processor_id() in preemptible [00000000] code: swapper/0/1 caller is debug_smp_processor_id+0x20/0x30 CPU: 6 PID: 1 Comm: swapper/0 Not tainted 5.10.63-yocto-standard #1 Hardware name: NXP Layerscape LX2160ARDB (DT) Call trace: dump_backtrace+0x0/0x1a0 show_stack+0x24/0x30 dump_stack+0xf0/0x13c check_preemption_disabled+0x100/0x110 debug_smp_processor_id+0x20/0x30 dpaa2_io_query_fq_count+0xdc/0x154 dpaa2_eth_stop+0x144/0x314 __dev_close_many+0xdc/0x160 __dev_change_flags+0xe8/0x220 dev_change_flags+0x30/0x70 ic_close_devs+0x50/0x78 ip_auto_config+0xed0/0xf10 do_one_initcall+0xac/0x460 kernel_init_freeable+0x30c/0x378 kernel_init+0x20/0x128 ret_from_fork+0x10/0x38 Based on comment in the context, it doesn't matter whether preemption is disable or not. So, replace smp_processor_id() with raw_smp_processor_id() to avoid above call trace. Fixes: c89105c9b390 ("staging: fsl-mc: Move DPIO from staging to drivers/soc/fsl") Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Meng Li <Meng.Li@xxxxxxxxxxxxx> Signed-off-by: Li Yang <leoyang.li@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/soc/fsl/dpio/dpio-service.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/soc/fsl/dpio/dpio-service.c +++ b/drivers/soc/fsl/dpio/dpio-service.c @@ -59,7 +59,7 @@ static inline struct dpaa2_io *service_s * potentially being migrated away. */ if (cpu < 0) - cpu = smp_processor_id(); + cpu = raw_smp_processor_id(); /* If a specific cpu was requested, pick it up immediately */ return dpio_by_cpu[cpu]; Patches currently in stable-queue which might be from Meng.Li@xxxxxxxxxxxxx are queue-5.14/soc-fsl-dpio-replace-smp_processor_id-with-raw_smp_processor_id.patch queue-5.14/soc-fsl-dpio-use-the-combined-functions-to-protect-critical-zone.patch