* [PATCH] soc: fsl: dpio: protect smp_processor_id when get processor id
@ 2021-10-15 6:36 ` Meng.Li
0 siblings, 0 replies; 9+ messages in thread
From: Meng.Li @ 2021-10-15 6:36 UTC (permalink / raw)
To: Roy.Pledge, leoyang.li, ruxandra.radulescu, horia.geanta
Cc: linux-kernel, linuxppc-dev, linux-arm-kernel, meng.li
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
Because smp_processor_id() should be invoked in preempt disable status.
So, add preempt_disable/enable() to protect 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 | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/soc/fsl/dpio/dpio-service.c b/drivers/soc/fsl/dpio/dpio-service.c
index 19f47ea9dab0..afc3b89b0fc5 100644
--- a/drivers/soc/fsl/dpio/dpio-service.c
+++ b/drivers/soc/fsl/dpio/dpio-service.c
@@ -58,8 +58,11 @@ static inline struct dpaa2_io *service_select_by_cpu(struct dpaa2_io *d,
* If cpu == -1, choose the current cpu, with no guarantees about
* potentially being migrated away.
*/
- if (cpu < 0)
- cpu = smp_processor_id();
+ if (cpu < 0) {
+ preempt_disable();
+ cpu = smp_processor_id();
+ preempt_enable();
+ }
/* If a specific cpu was requested, pick it up immediately */
return dpio_by_cpu[cpu];
--
2.17.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [PATCH] soc: fsl: dpio: protect smp_processor_id when get processor id
@ 2021-10-15 6:36 ` Meng.Li
0 siblings, 0 replies; 9+ messages in thread
From: Meng.Li @ 2021-10-15 6:36 UTC (permalink / raw)
To: Roy.Pledge, leoyang.li, ruxandra.radulescu, horia.geanta
Cc: linux-kernel, linuxppc-dev, linux-arm-kernel, meng.li
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
Because smp_processor_id() should be invoked in preempt disable status.
So, add preempt_disable/enable() to protect 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 | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/soc/fsl/dpio/dpio-service.c b/drivers/soc/fsl/dpio/dpio-service.c
index 19f47ea9dab0..afc3b89b0fc5 100644
--- a/drivers/soc/fsl/dpio/dpio-service.c
+++ b/drivers/soc/fsl/dpio/dpio-service.c
@@ -58,8 +58,11 @@ static inline struct dpaa2_io *service_select_by_cpu(struct dpaa2_io *d,
* If cpu == -1, choose the current cpu, with no guarantees about
* potentially being migrated away.
*/
- if (cpu < 0)
- cpu = smp_processor_id();
+ if (cpu < 0) {
+ preempt_disable();
+ cpu = smp_processor_id();
+ preempt_enable();
+ }
/* If a specific cpu was requested, pick it up immediately */
return dpio_by_cpu[cpu];
--
2.17.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [PATCH] soc: fsl: dpio: protect smp_processor_id when get processor id
@ 2021-10-15 6:36 ` Meng.Li
0 siblings, 0 replies; 9+ messages in thread
From: Meng.Li @ 2021-10-15 6:36 UTC (permalink / raw)
To: Roy.Pledge, leoyang.li, ruxandra.radulescu, horia.geanta
Cc: meng.li, linuxppc-dev, linux-kernel, linux-arm-kernel
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
Because smp_processor_id() should be invoked in preempt disable status.
So, add preempt_disable/enable() to protect 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 | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/soc/fsl/dpio/dpio-service.c b/drivers/soc/fsl/dpio/dpio-service.c
index 19f47ea9dab0..afc3b89b0fc5 100644
--- a/drivers/soc/fsl/dpio/dpio-service.c
+++ b/drivers/soc/fsl/dpio/dpio-service.c
@@ -58,8 +58,11 @@ static inline struct dpaa2_io *service_select_by_cpu(struct dpaa2_io *d,
* If cpu == -1, choose the current cpu, with no guarantees about
* potentially being migrated away.
*/
- if (cpu < 0)
- cpu = smp_processor_id();
+ if (cpu < 0) {
+ preempt_disable();
+ cpu = smp_processor_id();
+ preempt_enable();
+ }
/* If a specific cpu was requested, pick it up immediately */
return dpio_by_cpu[cpu];
--
2.17.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* Re: [PATCH] soc: fsl: dpio: protect smp_processor_id when get processor id
2021-10-15 6:36 ` Meng.Li
(?)
@ 2021-10-15 13:39 ` Robin Murphy
-1 siblings, 0 replies; 9+ messages in thread
From: Robin Murphy @ 2021-10-15 13:39 UTC (permalink / raw)
To: Meng.Li, Roy.Pledge, leoyang.li, ruxandra.radulescu, horia.geanta
Cc: linux-kernel, linuxppc-dev, linux-arm-kernel
On 2021-10-15 07:36, Meng.Li@windriver.com wrote:
> 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
>
> Because smp_processor_id() should be invoked in preempt disable status.
> So, add preempt_disable/enable() to protect smp_processor_id().
If preemption doesn't matter anyway, as the comment in the context
implies, then it probably makes more sense just to use
raw_smp_processor_id() instead.
Robin.
> 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 | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/soc/fsl/dpio/dpio-service.c b/drivers/soc/fsl/dpio/dpio-service.c
> index 19f47ea9dab0..afc3b89b0fc5 100644
> --- a/drivers/soc/fsl/dpio/dpio-service.c
> +++ b/drivers/soc/fsl/dpio/dpio-service.c
> @@ -58,8 +58,11 @@ static inline struct dpaa2_io *service_select_by_cpu(struct dpaa2_io *d,
> * If cpu == -1, choose the current cpu, with no guarantees about
> * potentially being migrated away.
> */
> - if (cpu < 0)
> - cpu = smp_processor_id();
> + if (cpu < 0) {
> + preempt_disable();
> + cpu = smp_processor_id();
> + preempt_enable();
> + }
>
> /* If a specific cpu was requested, pick it up immediately */
> return dpio_by_cpu[cpu];
>
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH] soc: fsl: dpio: protect smp_processor_id when get processor id
@ 2021-10-15 13:39 ` Robin Murphy
0 siblings, 0 replies; 9+ messages in thread
From: Robin Murphy @ 2021-10-15 13:39 UTC (permalink / raw)
To: Meng.Li, Roy.Pledge, leoyang.li, ruxandra.radulescu, horia.geanta
Cc: linuxppc-dev, linux-kernel, linux-arm-kernel
On 2021-10-15 07:36, Meng.Li@windriver.com wrote:
> 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
>
> Because smp_processor_id() should be invoked in preempt disable status.
> So, add preempt_disable/enable() to protect smp_processor_id().
If preemption doesn't matter anyway, as the comment in the context
implies, then it probably makes more sense just to use
raw_smp_processor_id() instead.
Robin.
> 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 | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/soc/fsl/dpio/dpio-service.c b/drivers/soc/fsl/dpio/dpio-service.c
> index 19f47ea9dab0..afc3b89b0fc5 100644
> --- a/drivers/soc/fsl/dpio/dpio-service.c
> +++ b/drivers/soc/fsl/dpio/dpio-service.c
> @@ -58,8 +58,11 @@ static inline struct dpaa2_io *service_select_by_cpu(struct dpaa2_io *d,
> * If cpu == -1, choose the current cpu, with no guarantees about
> * potentially being migrated away.
> */
> - if (cpu < 0)
> - cpu = smp_processor_id();
> + if (cpu < 0) {
> + preempt_disable();
> + cpu = smp_processor_id();
> + preempt_enable();
> + }
>
> /* If a specific cpu was requested, pick it up immediately */
> return dpio_by_cpu[cpu];
>
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH] soc: fsl: dpio: protect smp_processor_id when get processor id
@ 2021-10-15 13:39 ` Robin Murphy
0 siblings, 0 replies; 9+ messages in thread
From: Robin Murphy @ 2021-10-15 13:39 UTC (permalink / raw)
To: Meng.Li, Roy.Pledge, leoyang.li, ruxandra.radulescu, horia.geanta
Cc: linux-kernel, linuxppc-dev, linux-arm-kernel
On 2021-10-15 07:36, Meng.Li@windriver.com wrote:
> 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
>
> Because smp_processor_id() should be invoked in preempt disable status.
> So, add preempt_disable/enable() to protect smp_processor_id().
If preemption doesn't matter anyway, as the comment in the context
implies, then it probably makes more sense just to use
raw_smp_processor_id() instead.
Robin.
> 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 | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/soc/fsl/dpio/dpio-service.c b/drivers/soc/fsl/dpio/dpio-service.c
> index 19f47ea9dab0..afc3b89b0fc5 100644
> --- a/drivers/soc/fsl/dpio/dpio-service.c
> +++ b/drivers/soc/fsl/dpio/dpio-service.c
> @@ -58,8 +58,11 @@ static inline struct dpaa2_io *service_select_by_cpu(struct dpaa2_io *d,
> * If cpu == -1, choose the current cpu, with no guarantees about
> * potentially being migrated away.
> */
> - if (cpu < 0)
> - cpu = smp_processor_id();
> + if (cpu < 0) {
> + preempt_disable();
> + cpu = smp_processor_id();
> + preempt_enable();
> + }
>
> /* If a specific cpu was requested, pick it up immediately */
> return dpio_by_cpu[cpu];
>
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 9+ messages in thread
* RE: [PATCH] soc: fsl: dpio: protect smp_processor_id when get processor id
2021-10-15 13:39 ` Robin Murphy
(?)
@ 2021-10-15 16:37 ` Li, Meng
-1 siblings, 0 replies; 9+ messages in thread
From: Li, Meng @ 2021-10-15 16:37 UTC (permalink / raw)
To: Robin Murphy, Roy.Pledge, leoyang.li, ruxandra.radulescu, horia.geanta
Cc: linux-kernel, linuxppc-dev, linux-arm-kernel
> -----Original Message-----
> From: Robin Murphy <robin.murphy@arm.com>
> Sent: Friday, October 15, 2021 9:40 PM
> To: Li, Meng <Meng.Li@windriver.com>; 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
> Subject: Re: [PATCH] soc: fsl: dpio: protect smp_processor_id when get
> processor id
>
> [Please note: This e-mail is from an EXTERNAL e-mail address]
>
> On 2021-10-15 07:36, Meng.Li@windriver.com wrote:
> > 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
> >
> > Because smp_processor_id() should be invoked in preempt disable status.
> > So, add preempt_disable/enable() to protect smp_processor_id().
>
> If preemption doesn't matter anyway, as the comment in the context implies,
> then it probably makes more sense just to use
> raw_smp_processor_id() instead.
>
Thanks for your professional suggest, I will raw_smp_processor_id() and test.
If works fine, I will send v2 patch.
Thanks,
Limeng
> Robin.
>
> > 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 | 7 +++++--
> > 1 file changed, 5 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/soc/fsl/dpio/dpio-service.c
> > b/drivers/soc/fsl/dpio/dpio-service.c
> > index 19f47ea9dab0..afc3b89b0fc5 100644
> > --- a/drivers/soc/fsl/dpio/dpio-service.c
> > +++ b/drivers/soc/fsl/dpio/dpio-service.c
> > @@ -58,8 +58,11 @@ static inline struct dpaa2_io
> *service_select_by_cpu(struct dpaa2_io *d,
> > * If cpu == -1, choose the current cpu, with no guarantees about
> > * potentially being migrated away.
> > */
> > - if (cpu < 0)
> > - cpu = smp_processor_id();
> > + if (cpu < 0) {
> > + preempt_disable();
> > + cpu = smp_processor_id();
> > + preempt_enable();
> > + }
> >
> > /* If a specific cpu was requested, pick it up immediately */
> > return dpio_by_cpu[cpu];
> >
^ permalink raw reply [flat|nested] 9+ messages in thread
* RE: [PATCH] soc: fsl: dpio: protect smp_processor_id when get processor id
@ 2021-10-15 16:37 ` Li, Meng
0 siblings, 0 replies; 9+ messages in thread
From: Li, Meng @ 2021-10-15 16:37 UTC (permalink / raw)
To: Robin Murphy, Roy.Pledge, leoyang.li, ruxandra.radulescu, horia.geanta
Cc: linux-kernel, linuxppc-dev, linux-arm-kernel
> -----Original Message-----
> From: Robin Murphy <robin.murphy@arm.com>
> Sent: Friday, October 15, 2021 9:40 PM
> To: Li, Meng <Meng.Li@windriver.com>; 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
> Subject: Re: [PATCH] soc: fsl: dpio: protect smp_processor_id when get
> processor id
>
> [Please note: This e-mail is from an EXTERNAL e-mail address]
>
> On 2021-10-15 07:36, Meng.Li@windriver.com wrote:
> > 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
> >
> > Because smp_processor_id() should be invoked in preempt disable status.
> > So, add preempt_disable/enable() to protect smp_processor_id().
>
> If preemption doesn't matter anyway, as the comment in the context implies,
> then it probably makes more sense just to use
> raw_smp_processor_id() instead.
>
Thanks for your professional suggest, I will raw_smp_processor_id() and test.
If works fine, I will send v2 patch.
Thanks,
Limeng
> Robin.
>
> > 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 | 7 +++++--
> > 1 file changed, 5 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/soc/fsl/dpio/dpio-service.c
> > b/drivers/soc/fsl/dpio/dpio-service.c
> > index 19f47ea9dab0..afc3b89b0fc5 100644
> > --- a/drivers/soc/fsl/dpio/dpio-service.c
> > +++ b/drivers/soc/fsl/dpio/dpio-service.c
> > @@ -58,8 +58,11 @@ static inline struct dpaa2_io
> *service_select_by_cpu(struct dpaa2_io *d,
> > * If cpu == -1, choose the current cpu, with no guarantees about
> > * potentially being migrated away.
> > */
> > - if (cpu < 0)
> > - cpu = smp_processor_id();
> > + if (cpu < 0) {
> > + preempt_disable();
> > + cpu = smp_processor_id();
> > + preempt_enable();
> > + }
> >
> > /* If a specific cpu was requested, pick it up immediately */
> > return dpio_by_cpu[cpu];
> >
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^ permalink raw reply [flat|nested] 9+ messages in thread
* RE: [PATCH] soc: fsl: dpio: protect smp_processor_id when get processor id
@ 2021-10-15 16:37 ` Li, Meng
0 siblings, 0 replies; 9+ messages in thread
From: Li, Meng @ 2021-10-15 16:37 UTC (permalink / raw)
To: Robin Murphy, Roy.Pledge, leoyang.li, ruxandra.radulescu, horia.geanta
Cc: linuxppc-dev, linux-kernel, linux-arm-kernel
> -----Original Message-----
> From: Robin Murphy <robin.murphy@arm.com>
> Sent: Friday, October 15, 2021 9:40 PM
> To: Li, Meng <Meng.Li@windriver.com>; 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
> Subject: Re: [PATCH] soc: fsl: dpio: protect smp_processor_id when get
> processor id
>
> [Please note: This e-mail is from an EXTERNAL e-mail address]
>
> On 2021-10-15 07:36, Meng.Li@windriver.com wrote:
> > 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
> >
> > Because smp_processor_id() should be invoked in preempt disable status.
> > So, add preempt_disable/enable() to protect smp_processor_id().
>
> If preemption doesn't matter anyway, as the comment in the context implies,
> then it probably makes more sense just to use
> raw_smp_processor_id() instead.
>
Thanks for your professional suggest, I will raw_smp_processor_id() and test.
If works fine, I will send v2 patch.
Thanks,
Limeng
> Robin.
>
> > 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 | 7 +++++--
> > 1 file changed, 5 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/soc/fsl/dpio/dpio-service.c
> > b/drivers/soc/fsl/dpio/dpio-service.c
> > index 19f47ea9dab0..afc3b89b0fc5 100644
> > --- a/drivers/soc/fsl/dpio/dpio-service.c
> > +++ b/drivers/soc/fsl/dpio/dpio-service.c
> > @@ -58,8 +58,11 @@ static inline struct dpaa2_io
> *service_select_by_cpu(struct dpaa2_io *d,
> > * If cpu == -1, choose the current cpu, with no guarantees about
> > * potentially being migrated away.
> > */
> > - if (cpu < 0)
> > - cpu = smp_processor_id();
> > + if (cpu < 0) {
> > + preempt_disable();
> > + cpu = smp_processor_id();
> > + preempt_enable();
> > + }
> >
> > /* If a specific cpu was requested, pick it up immediately */
> > return dpio_by_cpu[cpu];
> >
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2021-10-15 23:09 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-10-15 6:36 [PATCH] soc: fsl: dpio: protect smp_processor_id when get processor id Meng.Li
2021-10-15 6:36 ` Meng.Li
2021-10-15 6:36 ` Meng.Li
2021-10-15 13:39 ` Robin Murphy
2021-10-15 13:39 ` Robin Murphy
2021-10-15 13:39 ` Robin Murphy
2021-10-15 16:37 ` Li, Meng
2021-10-15 16:37 ` Li, Meng
2021-10-15 16:37 ` Li, Meng
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