Searched hist:c45361ab (Results 1 – 3 of 3) sorted by relevance
/openbmc/linux/arch/powerpc/platforms/85xx/ |
H A D | mpc85xx_pm_ops.c | c45361ab Tue Sep 28 22:36:46 CDT 2021 Xiaoming Ni <nixiaoming@huawei.com> powerpc/85xx: fix timebase sync issue when CONFIG_HOTPLUG_CPU=n
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> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210929033646.39630-3-nixiaoming@huawei.com
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H A D | Makefile | c45361ab Tue Sep 28 22:36:46 CDT 2021 Xiaoming Ni <nixiaoming@huawei.com> powerpc/85xx: fix timebase sync issue when CONFIG_HOTPLUG_CPU=n
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> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210929033646.39630-3-nixiaoming@huawei.com
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H A D | smp.c | c45361ab Tue Sep 28 22:36:46 CDT 2021 Xiaoming Ni <nixiaoming@huawei.com> powerpc/85xx: fix timebase sync issue when CONFIG_HOTPLUG_CPU=n
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> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210929033646.39630-3-nixiaoming@huawei.com
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