diff options
| author | Xiaoming Ni <nixiaoming@huawei.com> | 2021-09-29 11:36:46 +0800 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-10-09 00:15:58 +1100 |
| commit | c45361abb9185b1e172bd75eff51ad5f601ccae4 (patch) | |
| tree | 58fb6e81c6cbca2a7a1878d30e7d6d75924be447 /arch/powerpc/platforms/85xx/smp.c | |
| parent | 3c2172c1c47b4079c29f0e6637d764a99355ebcd (diff) | |
| download | lwn-c45361abb9185b1e172bd75eff51ad5f601ccae4.tar.gz lwn-c45361abb9185b1e172bd75eff51ad5f601ccae4.zip | |
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
Diffstat (limited to 'arch/powerpc/platforms/85xx/smp.c')
| -rw-r--r-- | arch/powerpc/platforms/85xx/smp.c | 12 |
1 files changed, 6 insertions, 6 deletions
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 |