From: Meng.Li@windriver.com
To: Roy.Pledge@nxp.com, leoyang.li@nxp.com,
ruxandra.radulescu@nxp.com, horia.geanta@nxp.com
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-arm-kernel@lists.infradead.org, meng.li@windriver.com
Subject: [PATCH v2] soc: fsl: dpio: instead smp_processor_id with raw_smp_processor_id
Date: Tue, 19 Oct 2021 10:32:41 +0800 [thread overview]
Message-ID: <20211019023241.17466-1-Meng.Li@windriver.com> (raw)
From: Meng Li <Meng.Li@windriver.com>
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, instead smp_processor_id()
with raw_smp_processor_id() to avoid above call trace.
v2:
Remove the preempt_disable/enable() protection, instead smp_processor_id
with raw_smp_processor_id.
Fixes: c89105c9b390 ("staging: fsl-mc: Move DPIO from staging to drivers/soc/fsl")
Cc: stable@vger.kernel.org
Signed-off-by: Meng Li <Meng.Li@windriver.com>
---
drivers/soc/fsl/dpio/dpio-service.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/soc/fsl/dpio/dpio-service.c b/drivers/soc/fsl/dpio/dpio-service.c
index 19f47ea9dab0..3050a534d42c 100644
--- 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_select_by_cpu(struct dpaa2_io *d,
* 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];
--
2.17.1
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next reply other threads:[~2021-10-19 2:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-19 2:32 Meng.Li [this message]
2021-10-20 1:35 ` [PATCH v2] soc: fsl: dpio: instead smp_processor_id with raw_smp_processor_id Li Yang
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