* [PATCH] powerpc:85xx: fix timebase sync issue when CONFIG_HOTPLUG_CPU=n
@ 2021-09-26 2:51 Xiaoming Ni
2021-09-26 12:34 ` Xiaoming Ni
0 siblings, 1 reply; 6+ messages in thread
From: Xiaoming Ni @ 2021-09-26 2:51 UTC (permalink / raw)
To: linux-kernel, oss, mpe, benh, paulus, paul.gortmaker,
Yuantian.Tang, chenhui.zhao, linuxppc-dev
Cc: nixiaoming, wangle6, wangxiongfeng2
When CONFIG_SMP=y, timebase synchronization is required when the second
kernel is started.
arch/powerpc/kernel/smp.c:
int __cpu_up(unsigned int cpu, struct task_struct *tidle)
{
...
if (smp_ops->give_timebase)
smp_ops->give_timebase();
...
}
void start_secondary(void *unused)
{
...
if (smp_ops->take_timebase)
smp_ops->take_timebase();
...
}
When CONFIG_HOTPLUG_CPU=n and CONFIG_KEXEC_CORE=n,
smp_85xx_ops.give_timebase is NULL,
smp_85xx_ops.take_timebase is NULL,
As a result, the timebase is not synchronized.
Timebase synchronization does not depend on CONFIG_HOTPLUG_CPU.
Fixes: 56f1ba280719 ("powerpc/mpc85xx: refactor the PM operations")
Cc: stable@vger.kernel.org #v4.6
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
---
arch/powerpc/platforms/85xx/Makefile | 2 +-
arch/powerpc/platforms/85xx/mpc85xx_pm_ops.c | 4 ++++
arch/powerpc/platforms/85xx/smp.c | 9 ++++-----
3 files changed, 9 insertions(+), 6 deletions(-)
diff --git a/arch/powerpc/platforms/85xx/Makefile b/arch/powerpc/platforms/85xx/Makefile
index 60e4e97a929d..71ce1f6b6966 100644
--- a/arch/powerpc/platforms/85xx/Makefile
+++ b/arch/powerpc/platforms/85xx/Makefile
@@ -3,7 +3,7 @@
# Makefile for the PowerPC 85xx linux kernel.
#
obj-$(CONFIG_SMP) += smp.o
-obj-$(CONFIG_FSL_PMC) += mpc85xx_pm_ops.o
+obj-$(CONFIG_SMP) += mpc85xx_pm_ops.o
obj-y += common.o
diff --git a/arch/powerpc/platforms/85xx/mpc85xx_pm_ops.c b/arch/powerpc/platforms/85xx/mpc85xx_pm_ops.c
index 7c0133f558d0..a5656b3e9701 100644
--- a/arch/powerpc/platforms/85xx/mpc85xx_pm_ops.c
+++ b/arch/powerpc/platforms/85xx/mpc85xx_pm_ops.c
@@ -17,6 +17,7 @@
static struct ccsr_guts __iomem *guts;
+#ifdef CONFIG_FSL_PMC
static void mpc85xx_irq_mask(int cpu)
{
@@ -49,6 +50,7 @@ static void mpc85xx_cpu_up_prepare(int cpu)
{
}
+#endif
static void mpc85xx_freeze_time_base(bool freeze)
{
@@ -76,10 +78,12 @@ static const struct of_device_id mpc85xx_smp_guts_ids[] = {
static const struct fsl_pm_ops mpc85xx_pm_ops = {
.freeze_time_base = mpc85xx_freeze_time_base,
+#ifdef CONFIG_FSL_PMC
.irq_mask = mpc85xx_irq_mask,
.irq_unmask = mpc85xx_irq_unmask,
.cpu_die = mpc85xx_cpu_die,
.cpu_up_prepare = mpc85xx_cpu_up_prepare,
+#endif
};
int __init mpc85xx_setup_pmc(void)
diff --git a/arch/powerpc/platforms/85xx/smp.c b/arch/powerpc/platforms/85xx/smp.c
index c6df294054fe..349298cd9671 100644
--- a/arch/powerpc/platforms/85xx/smp.c
+++ b/arch/powerpc/platforms/85xx/smp.c
@@ -40,7 +40,6 @@ struct epapr_spin_table {
u32 pir;
};
-#ifdef CONFIG_HOTPLUG_CPU
static u64 timebase;
static int tb_req;
static int tb_valid;
@@ -112,6 +111,7 @@ static void mpc85xx_take_timebase(void)
local_irq_restore(flags);
}
+#ifdef CONFIG_HOTPLUG_CPU
static void smp_85xx_cpu_offline_self(void)
{
unsigned int cpu = smp_processor_id();
@@ -499,17 +499,16 @@ void __init mpc85xx_smp_init(void)
#ifdef CONFIG_FSL_CORENET_RCPM
fsl_rcpm_init();
#endif
-
-#ifdef CONFIG_FSL_PMC
- mpc85xx_setup_pmc();
#endif
+ mpc85xx_setup_pmc();
if (qoriq_pm_ops) {
smp_85xx_ops.give_timebase = mpc85xx_give_timebase;
smp_85xx_ops.take_timebase = mpc85xx_take_timebase;
+#ifdef CONFIG_HOTPLUG_CPU
smp_85xx_ops.cpu_offline_self = smp_85xx_cpu_offline_self;
smp_85xx_ops.cpu_die = qoriq_cpu_kill;
- }
#endif
+ }
smp_ops = &smp_85xx_ops;
#ifdef CONFIG_KEXEC_CORE
--
2.27.0
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH] powerpc:85xx: fix timebase sync issue when CONFIG_HOTPLUG_CPU=n
2021-09-26 2:51 [PATCH] powerpc:85xx: fix timebase sync issue when CONFIG_HOTPLUG_CPU=n Xiaoming Ni
@ 2021-09-26 12:34 ` Xiaoming Ni
2021-09-29 3:36 ` [PATCH v2 0/2] " Xiaoming Ni
0 siblings, 1 reply; 6+ messages in thread
From: Xiaoming Ni @ 2021-09-26 12:34 UTC (permalink / raw)
To: linux-kernel, oss, mpe, benh, paulus, paul.gortmaker,
Yuantian.Tang, chenhui.zhao, linuxppc-dev
Cc: wangle6, wangxiongfeng2
On 2021/9/26 10:51, Xiaoming Ni wrote:
> When CONFIG_SMP=y, timebase synchronization is required when the second
> kernel is started.
> arch/powerpc/kernel/smp.c:
> int __cpu_up(unsigned int cpu, struct task_struct *tidle)
> {
> ...
> if (smp_ops->give_timebase)
> smp_ops->give_timebase();
> ...
> }
>
> void start_secondary(void *unused)
> {
> ...
> if (smp_ops->take_timebase)
> smp_ops->take_timebase();
> ...
> }
>
> When CONFIG_HOTPLUG_CPU=n and CONFIG_KEXEC_CORE=n,
> smp_85xx_ops.give_timebase is NULL,
> smp_85xx_ops.take_timebase is NULL,
> As a result, the timebase is not synchronized.
>
> Timebase synchronization does not depend on CONFIG_HOTPLUG_CPU.
>
> Fixes: 56f1ba280719 ("powerpc/mpc85xx: refactor the PM operations")
> Cc: stable@vger.kernel.org #v4.6
> Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
> ---
> arch/powerpc/platforms/85xx/Makefile | 2 +-
> arch/powerpc/platforms/85xx/mpc85xx_pm_ops.c | 4 ++++
> arch/powerpc/platforms/85xx/smp.c | 9 ++++-----
> 3 files changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/arch/powerpc/platforms/85xx/Makefile b/arch/powerpc/platforms/85xx/Makefile
> index 60e4e97a929d..71ce1f6b6966 100644
> --- a/arch/powerpc/platforms/85xx/Makefile
> +++ b/arch/powerpc/platforms/85xx/Makefile
> @@ -3,7 +3,7 @@
> # Makefile for the PowerPC 85xx linux kernel.
> #
> obj-$(CONFIG_SMP) += smp.o
> -obj-$(CONFIG_FSL_PMC) += mpc85xx_pm_ops.o
> +obj-$(CONFIG_SMP) += mpc85xx_pm_ops.o
>
> obj-y += common.o
>
> diff --git a/arch/powerpc/platforms/85xx/mpc85xx_pm_ops.c b/arch/powerpc/platforms/85xx/mpc85xx_pm_ops.c
> index 7c0133f558d0..a5656b3e9701 100644
> --- a/arch/powerpc/platforms/85xx/mpc85xx_pm_ops.c
> +++ b/arch/powerpc/platforms/85xx/mpc85xx_pm_ops.c
> @@ -17,6 +17,7 @@
>
> static struct ccsr_guts __iomem *guts;
>
> +#ifdef CONFIG_FSL_PMC
> static void mpc85xx_irq_mask(int cpu)
> {
>
> @@ -49,6 +50,7 @@ static void mpc85xx_cpu_up_prepare(int cpu)
> {
>
> }
> +#endif
>
> static void mpc85xx_freeze_time_base(bool freeze)
> {
> @@ -76,10 +78,12 @@ static const struct of_device_id mpc85xx_smp_guts_ids[] = {
>
> static const struct fsl_pm_ops mpc85xx_pm_ops = {
> .freeze_time_base = mpc85xx_freeze_time_base,
> +#ifdef CONFIG_FSL_PMC
> .irq_mask = mpc85xx_irq_mask,
> .irq_unmask = mpc85xx_irq_unmask,
> .cpu_die = mpc85xx_cpu_die,
> .cpu_up_prepare = mpc85xx_cpu_up_prepare,
> +#endif
> };
>
> int __init mpc85xx_setup_pmc(void)
> diff --git a/arch/powerpc/platforms/85xx/smp.c b/arch/powerpc/platforms/85xx/smp.c
> index c6df294054fe..349298cd9671 100644
> --- a/arch/powerpc/platforms/85xx/smp.c
> +++ b/arch/powerpc/platforms/85xx/smp.c
> @@ -40,7 +40,6 @@ struct epapr_spin_table {
> u32 pir;
> };
>
> -#ifdef CONFIG_HOTPLUG_CPU
> static u64 timebase;
> static int tb_req;
> static int tb_valid;
> @@ -112,6 +111,7 @@ static void mpc85xx_take_timebase(void)
> local_irq_restore(flags);
> }
>
> +#ifdef CONFIG_HOTPLUG_CPU
> static void smp_85xx_cpu_offline_self(void)
> {
> unsigned int cpu = smp_processor_id();
> @@ -499,17 +499,16 @@ void __init mpc85xx_smp_init(void)
> #ifdef CONFIG_FSL_CORENET_RCPM
> fsl_rcpm_init();
> #endif
> -
> -#ifdef CONFIG_FSL_PMC
> - mpc85xx_setup_pmc();
> #endif
> + mpc85xx_setup_pmc();
> if (qoriq_pm_ops) {
> smp_85xx_ops.give_timebase = mpc85xx_give_timebase;
> smp_85xx_ops.take_timebase = mpc85xx_take_timebase;
> +#ifdef CONFIG_HOTPLUG_CPU
> smp_85xx_ops.cpu_offline_self = smp_85xx_cpu_offline_self;
> smp_85xx_ops.cpu_die = qoriq_cpu_kill;
> - }
> #endif
> + }
> smp_ops = &smp_85xx_ops;
>
> #ifdef CONFIG_KEXEC_CORE
>
I found inconsistent time values on different CPUs on my mpc8572 and
used this patch to fix it.
But today I found out in ppc64 testing that this patch causes the system
to trigger oops in the function mpc85xx_freeze_time_base(): the variable
"guts" is a null pointer.
I'm sorry to bother you.
I'll fix it and resend v2 later,
Thanks
Xiaoming Ni
^ permalink raw reply [flat|nested] 6+ messages in thread* [PATCH v2 0/2] powerpc:85xx: fix timebase sync issue when CONFIG_HOTPLUG_CPU=n
2021-09-26 12:34 ` Xiaoming Ni
@ 2021-09-29 3:36 ` Xiaoming Ni
2021-09-29 3:36 ` [PATCH v2 1/2] powerpc:85xx:Fix oops when mpc85xx_smp_guts_ids node cannot be found Xiaoming Ni
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: Xiaoming Ni @ 2021-09-29 3:36 UTC (permalink / raw)
To: oss, mpe, benh, paulus, paul.gortmaker, chenhui.zhao,
Yuantian.Tang, linuxppc-dev, linux-kernel, stable, gregkh
Cc: wangle6, liuwenliang, chenjianguo3, nixiaoming
When CONFIG_SMP=y, timebase synchronization is required for mpc8572 when
the second kernel is started
arch/powerpc/kernel/smp.c:
int __cpu_up(unsigned int cpu, struct task_struct *tidle)
{
...
if (smp_ops->give_timebase)
smp_ops->give_timebase();
...
}
void start_secondary(void *unused)
{
...
if (smp_ops->take_timebase)
smp_ops->take_timebase();
...
}
When CONFIG_HOTPLUG_CPU=n and CONFIG_KEXEC_CORE=n,
smp_85xx_ops.give_timebase is NULL,
smp_85xx_ops.take_timebase is NULL,
As a result, the timebase is not synchronized.
test code:
for i in $(seq 1 3); do taskset 1 date; taskset 2 date; sleep 1; echo;done
log:
Sat Sep 25 18:50:00 CST 2021
Sat Sep 25 19:07:47 CST 2021
Sat Sep 25 18:50:01 CST 2021
Sat Sep 25 19:07:48 CST 2021
Sat Sep 25 18:50:02 CST 2021
Sat Sep 25 19:07:49 CST 2021
Code snippet about give_timebase and take_timebase assignments:
arch/powerpc/platforms/85xx/smp.c:
#ifdef CONFIG_HOTPLUG_CPU
#ifdef CONFIG_FSL_CORENET_RCPM
fsl_rcpm_init();
#endif
#ifdef CONFIG_FSL_PMC
mpc85xx_setup_pmc();
#endif
if (qoriq_pm_ops) {
smp_85xx_ops.give_timebase = mpc85xx_give_timebase;
smp_85xx_ops.take_timebase = mpc85xx_take_timebase;
config dependency:
FSL_CORENET_RCPM depends on the PPC_E500MC.
FSL_PMC depends on SUSPEND.
SUSPEND depends on ARCH_SUSPEND_POSSIBLE.
ARCH_SUSPEND_POSSIBLE depends on !PPC_E500MC.
CONFIG_HOTPLUG_CPU and CONFIG_FSL_PMC require the timebase function, but
the timebase should not depend on CONFIG_HOTPLUG_CPU and CONFIG_FSL_PMC.
Therefore, adjust the macro control range. Ensure that the corresponding
timebase hook function is not empty when the dtsi node is configured.
-----
changes in v2:
1. add new patch: "powerpc:85xx:Fix oops when mpc85xx_smp_guts_ids node
cannot be found"
2. Using !CONFIG_FSL_CORENET_RCPM to manage the timebase code of !PPC_E500MC
v1:
https://lore.kernel.org/lkml/20210926025144.55674-1-nixiaoming@huawei.com
------
Xiaoming Ni (2):
powerpc:85xx:Fix oops when mpc85xx_smp_guts_ids node cannot be found
powerpc:85xx: fix timebase sync issue when CONFIG_HOTPLUG_CPU=n
arch/powerpc/platforms/85xx/Makefile | 4 +++-
arch/powerpc/platforms/85xx/mpc85xx_pm_ops.c | 7 +++++--
arch/powerpc/platforms/85xx/smp.c | 12 ++++++------
3 files changed, 14 insertions(+), 9 deletions(-)
--
2.27.0
^ permalink raw reply [flat|nested] 6+ messages in thread* [PATCH v2 1/2] powerpc:85xx:Fix oops when mpc85xx_smp_guts_ids node cannot be found
2021-09-29 3:36 ` [PATCH v2 0/2] " Xiaoming Ni
@ 2021-09-29 3:36 ` Xiaoming Ni
2021-09-29 3:36 ` [PATCH v2 2/2] powerpc:85xx: fix timebase sync issue when CONFIG_HOTPLUG_CPU=n Xiaoming Ni
2021-10-11 12:06 ` [PATCH v2 0/2] " Michael Ellerman
2 siblings, 0 replies; 6+ messages in thread
From: Xiaoming Ni @ 2021-09-29 3:36 UTC (permalink / raw)
To: oss, mpe, benh, paulus, paul.gortmaker, chenhui.zhao,
Yuantian.Tang, linuxppc-dev, linux-kernel, stable, gregkh
Cc: wangle6, liuwenliang, chenjianguo3, nixiaoming
When the field described in mpc85xx_smp_guts_ids[] is not configured in
dtb, the mpc85xx_setup_pmc() does not assign a value to the "guts"
variable. As a result, the oops is triggered when
mpc85xx_freeze_time_base() is executed.
Fixes:56f1ba280719 ("powerpc/mpc85xx: refactor the PM operations")
Cc: stable@vger.kernel.org #v4.6
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
---
arch/powerpc/platforms/85xx/mpc85xx_pm_ops.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/arch/powerpc/platforms/85xx/mpc85xx_pm_ops.c b/arch/powerpc/platforms/85xx/mpc85xx_pm_ops.c
index 7c0133f558d0..ffa8a7a6a2db 100644
--- a/arch/powerpc/platforms/85xx/mpc85xx_pm_ops.c
+++ b/arch/powerpc/platforms/85xx/mpc85xx_pm_ops.c
@@ -94,9 +94,8 @@ int __init mpc85xx_setup_pmc(void)
pr_err("Could not map guts node address\n");
return -ENOMEM;
}
+ qoriq_pm_ops = &mpc85xx_pm_ops;
}
- qoriq_pm_ops = &mpc85xx_pm_ops;
-
return 0;
}
--
2.27.0
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v2 2/2] powerpc:85xx: fix timebase sync issue when CONFIG_HOTPLUG_CPU=n
2021-09-29 3:36 ` [PATCH v2 0/2] " Xiaoming Ni
2021-09-29 3:36 ` [PATCH v2 1/2] powerpc:85xx:Fix oops when mpc85xx_smp_guts_ids node cannot be found Xiaoming Ni
@ 2021-09-29 3:36 ` Xiaoming Ni
2021-10-11 12:06 ` [PATCH v2 0/2] " Michael Ellerman
2 siblings, 0 replies; 6+ messages in thread
From: Xiaoming Ni @ 2021-09-29 3:36 UTC (permalink / raw)
To: oss, mpe, benh, paulus, paul.gortmaker, chenhui.zhao,
Yuantian.Tang, linuxppc-dev, linux-kernel, stable, gregkh
Cc: wangle6, liuwenliang, chenjianguo3, nixiaoming
When CONFIG_SMP=y, timebase synchronization is required when the second
kernel is started.
arch/powerpc/kernel/smp.c:
int __cpu_up(unsigned int cpu, struct task_struct *tidle)
{
...
if (smp_ops->give_timebase)
smp_ops->give_timebase();
...
}
void start_secondary(void *unused)
{
...
if (smp_ops->take_timebase)
smp_ops->take_timebase();
...
}
When CONFIG_HOTPLUG_CPU=n and CONFIG_KEXEC_CORE=n,
smp_85xx_ops.give_timebase is NULL,
smp_85xx_ops.take_timebase is NULL,
As a result, the timebase is not synchronized.
Timebase synchronization does not depend on CONFIG_HOTPLUG_CPU.
Fixes: 56f1ba280719 ("powerpc/mpc85xx: refactor the PM operations")
Cc: stable@vger.kernel.org #v4.6
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
---
arch/powerpc/platforms/85xx/Makefile | 4 +++-
arch/powerpc/platforms/85xx/mpc85xx_pm_ops.c | 4 ++++
arch/powerpc/platforms/85xx/smp.c | 12 ++++++------
3 files changed, 13 insertions(+), 7 deletions(-)
diff --git a/arch/powerpc/platforms/85xx/Makefile b/arch/powerpc/platforms/85xx/Makefile
index 60e4e97a929d..260fbad7967b 100644
--- a/arch/powerpc/platforms/85xx/Makefile
+++ b/arch/powerpc/platforms/85xx/Makefile
@@ -3,7 +3,9 @@
# Makefile for the PowerPC 85xx linux kernel.
#
obj-$(CONFIG_SMP) += smp.o
-obj-$(CONFIG_FSL_PMC) += mpc85xx_pm_ops.o
+ifneq ($(CONFIG_FSL_CORENET_RCPM),y)
+obj-$(CONFIG_SMP) += mpc85xx_pm_ops.o
+endif
obj-y += common.o
diff --git a/arch/powerpc/platforms/85xx/mpc85xx_pm_ops.c b/arch/powerpc/platforms/85xx/mpc85xx_pm_ops.c
index ffa8a7a6a2db..4a8af80011a6 100644
--- a/arch/powerpc/platforms/85xx/mpc85xx_pm_ops.c
+++ b/arch/powerpc/platforms/85xx/mpc85xx_pm_ops.c
@@ -17,6 +17,7 @@
static struct ccsr_guts __iomem *guts;
+#ifdef CONFIG_FSL_PMC
static void mpc85xx_irq_mask(int cpu)
{
@@ -49,6 +50,7 @@ static void mpc85xx_cpu_up_prepare(int cpu)
{
}
+#endif
static void mpc85xx_freeze_time_base(bool freeze)
{
@@ -76,10 +78,12 @@ static const struct of_device_id mpc85xx_smp_guts_ids[] = {
static const struct fsl_pm_ops mpc85xx_pm_ops = {
.freeze_time_base = mpc85xx_freeze_time_base,
+#ifdef CONFIG_FSL_PMC
.irq_mask = mpc85xx_irq_mask,
.irq_unmask = mpc85xx_irq_unmask,
.cpu_die = mpc85xx_cpu_die,
.cpu_up_prepare = mpc85xx_cpu_up_prepare,
+#endif
};
int __init mpc85xx_setup_pmc(void)
diff --git a/arch/powerpc/platforms/85xx/smp.c b/arch/powerpc/platforms/85xx/smp.c
index c6df294054fe..83f4a6389a28 100644
--- a/arch/powerpc/platforms/85xx/smp.c
+++ b/arch/powerpc/platforms/85xx/smp.c
@@ -40,7 +40,6 @@ struct epapr_spin_table {
u32 pir;
};
-#ifdef CONFIG_HOTPLUG_CPU
static u64 timebase;
static int tb_req;
static int tb_valid;
@@ -112,6 +111,7 @@ static void mpc85xx_take_timebase(void)
local_irq_restore(flags);
}
+#ifdef CONFIG_HOTPLUG_CPU
static void smp_85xx_cpu_offline_self(void)
{
unsigned int cpu = smp_processor_id();
@@ -495,21 +495,21 @@ void __init mpc85xx_smp_init(void)
smp_85xx_ops.probe = NULL;
}
-#ifdef CONFIG_HOTPLUG_CPU
#ifdef CONFIG_FSL_CORENET_RCPM
+ /* Assign a value to qoriq_pm_ops on PPC_E500MC */
fsl_rcpm_init();
-#endif
-
-#ifdef CONFIG_FSL_PMC
+#else
+ /* Assign a value to qoriq_pm_ops on !PPC_E500MC */
mpc85xx_setup_pmc();
#endif
if (qoriq_pm_ops) {
smp_85xx_ops.give_timebase = mpc85xx_give_timebase;
smp_85xx_ops.take_timebase = mpc85xx_take_timebase;
+#ifdef CONFIG_HOTPLUG_CPU
smp_85xx_ops.cpu_offline_self = smp_85xx_cpu_offline_self;
smp_85xx_ops.cpu_die = qoriq_cpu_kill;
- }
#endif
+ }
smp_ops = &smp_85xx_ops;
#ifdef CONFIG_KEXEC_CORE
--
2.27.0
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH v2 0/2] powerpc:85xx: fix timebase sync issue when CONFIG_HOTPLUG_CPU=n
2021-09-29 3:36 ` [PATCH v2 0/2] " Xiaoming Ni
2021-09-29 3:36 ` [PATCH v2 1/2] powerpc:85xx:Fix oops when mpc85xx_smp_guts_ids node cannot be found Xiaoming Ni
2021-09-29 3:36 ` [PATCH v2 2/2] powerpc:85xx: fix timebase sync issue when CONFIG_HOTPLUG_CPU=n Xiaoming Ni
@ 2021-10-11 12:06 ` Michael Ellerman
2 siblings, 0 replies; 6+ messages in thread
From: Michael Ellerman @ 2021-10-11 12:06 UTC (permalink / raw)
To: paul.gortmaker, linuxppc-dev, mpe, Xiaoming Ni, stable, oss,
benh, chenhui.zhao, linux-kernel, gregkh, paulus, Yuantian.Tang
Cc: liuwenliang, chenjianguo3, wangle6
On Wed, 29 Sep 2021 11:36:44 +0800, Xiaoming Ni wrote:
> When CONFIG_SMP=y, timebase synchronization is required for mpc8572 when
> the second kernel is started
> arch/powerpc/kernel/smp.c:
> int __cpu_up(unsigned int cpu, struct task_struct *tidle)
> {
> ...
> if (smp_ops->give_timebase)
> smp_ops->give_timebase();
> ...
> }
>
> [...]
Applied to powerpc/next.
[1/2] powerpc:85xx:Fix oops when mpc85xx_smp_guts_ids node cannot be found
https://git.kernel.org/powerpc/c/3c2172c1c47b4079c29f0e6637d764a99355ebcd
[2/2] powerpc:85xx: fix timebase sync issue when CONFIG_HOTPLUG_CPU=n
https://git.kernel.org/powerpc/c/c45361abb9185b1e172bd75eff51ad5f601ccae4
cheers
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2021-09-26 2:51 [PATCH] powerpc:85xx: fix timebase sync issue when CONFIG_HOTPLUG_CPU=n Xiaoming Ni
2021-09-26 12:34 ` Xiaoming Ni
2021-09-29 3:36 ` [PATCH v2 0/2] " Xiaoming Ni
2021-09-29 3:36 ` [PATCH v2 1/2] powerpc:85xx:Fix oops when mpc85xx_smp_guts_ids node cannot be found Xiaoming Ni
2021-09-29 3:36 ` [PATCH v2 2/2] powerpc:85xx: fix timebase sync issue when CONFIG_HOTPLUG_CPU=n Xiaoming Ni
2021-10-11 12:06 ` [PATCH v2 0/2] " Michael Ellerman
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