@@ -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
@@ -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)
@@ -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
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(-)