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| author | Xiaoming Ni <nixiaoming@huawei.com> | 2021-09-29 06:36:46 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-18 21:17:20 +0300 |
| commit | 0084aaaec2d1bbf7d1510a2601644c19b39fe5f7 (patch) | |
| tree | bb9306604f03155778a58785855804ea301dc320 /.get_maintainer.ignore | |
| parent | 310b6f976c74a540ca413e518102eae7e0f2fc4e (diff) | |
| download | linux-0084aaaec2d1bbf7d1510a2601644c19b39fe5f7.tar.xz | |
powerpc/85xx: fix timebase sync issue when CONFIG_HOTPLUG_CPU=n
commit c45361abb9185b1e172bd75eff51ad5f601ccae4 upstream.
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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to '.get_maintainer.ignore')
0 files changed, 0 insertions, 0 deletions