[PATCH 05/12] sparc: Replace cpu_up/down with device_online/offline

Qais Yousef
2019-10-30T15:42:25Z

The core device API performs extra housekeeping bits that are missing
from directly calling cpu_up/down.

See commit a6717c01ddc2 ("powerpc/rtas: use device model APIs and
serialization during LPM") for an example description of what might go
wrong.

This also prepares to make cpu_up/down a private interface for anything
but the cpu subsystem.

Signed-off-by: Qais Yousef <qais.yousef@arm.com>
CC: "David S. Miller" <davem@davemloft.net>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Bjorn Helgaas <bhelgaas@google.com>
CC: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
CC: Sakari Ailus <sakari.ailus@linux.intel.com>
CC: sparclinux@vger.kernel.org
CC: linux-kernel@vger.kernel.org
---
arch/sparc/kernel/ds.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/sparc/kernel/ds.c b/arch/sparc/kernel/ds.c
index bbf59b3b4af8..39350e5dbaf1 100644
--- a/arch/sparc/kernel/ds.c
+++ b/arch/sparc/kernel/ds.c
@@ -550,12 +550,13 @@ static int dr_cpu_configure(struct ds_info *dp, struct ds_cap_state *cp,
mdesc_populate_present_mask(mask);
mdesc_fill_in_cpu_data(mask);

+ lock_device_hotplug();
for_each_cpu(cpu, mask) {
int err;

printk(KERN_INFO "ds-%llu: Starting cpu %d...\n",
dp->id, cpu);
- err = cpu_up(cpu);
+ err = device_online(get_cpu_device(cpu));
if (err) {
__u32 res = DR_CPU_RES_FAILURE;
__u32 stat = DR_CPU_STAT_UNCONFIGURED;
@@ -574,6 +575,7 @@ static int dr_cpu_configure(struct ds_info *dp, struct ds_cap_state *cp,
dr_cpu_mark(resp, cpu, ncpus, res, stat);
}
}
+ unlock_device_hotplug();

spin_lock_irqsave(&ds_lock, flags);
__ds_send(dp->lp, resp, resp_len);
@@ -606,17 +608,19 @@ static int dr_cpu_unconfigure(struct ds_info *dp,
resp_len, ncpus, mask,
DR_CPU_STAT_UNCONFIGURED);

+ lock_device_hotplug();
for_each_cpu(cpu, mask) {
int err;

printk(KERN_INFO "ds-%llu: Shutting down cpu %d...\n",
dp->id, cpu);
- err = cpu_down(cpu);
+ err = device_offline(get_cpu_device(cpu));
if (err)
dr_cpu_mark(resp, cpu, ncpus,
DR_CPU_RES_FAILURE,
DR_CPU_STAT_CONFIGURED);
}
+ unlock_device_hotplug();

spin_lock_irqsave(&ds_lock, flags);
__ds_send(dp->lp, resp, resp_len);
--
2.17.1