Messages in this thread Patch in this message | | | From | Dan Streetman <> | Subject | [PATCH] powerpc: use device_online/offline() instead of cpu_up/down() | Date | Fri, 31 Oct 2014 15:41:34 -0400 |
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In powerpc pseries platform dlpar operations, Use device_online() and device_offline() instead of cpu_up() and cpu_down().
Calling cpu_up/down directly does not update the cpu device offline field, which is used to online/offline a cpu from sysfs. Calling device_online/offline instead keeps the sysfs cpu online value correct. The hotplug lock, which is required to be held when calling device_online/offline, is already held when dlpar_online/offline_cpu are called, since they are called only from cpu_probe|release_store.
This patch fixes errors on PowerVM systems that have cpu(s) added/removed using dlpar operations; without this patch, the /sys/devices/system/cpu/cpuN/online nodes do not correctly show the online state of added/removed cpus.
Signed-off-by: Dan Streetman <ddstreet@ieee.org> Cc: Nathan Fontenot <nfont@linux.vnet.ibm.com> ---
Previous discussion for this: https://lkml.org/lkml/2014/10/29/839
arch/powerpc/platforms/pseries/dlpar.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c index 6ad83bd..c22bb1b 100644 --- a/arch/powerpc/platforms/pseries/dlpar.c +++ b/arch/powerpc/platforms/pseries/dlpar.c @@ -382,7 +382,7 @@ static int dlpar_online_cpu(struct device_node *dn) BUG_ON(get_cpu_current_state(cpu) != CPU_STATE_OFFLINE); cpu_maps_update_done(); - rc = cpu_up(cpu); + rc = device_online(get_cpu_device(cpu)); if (rc) goto out; cpu_maps_update_begin(); @@ -467,7 +467,7 @@ static int dlpar_offline_cpu(struct device_node *dn) if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) { set_preferred_offline_state(cpu, CPU_STATE_OFFLINE); cpu_maps_update_done(); - rc = cpu_down(cpu); + rc = device_offline(get_cpu_device(cpu)); if (rc) goto out; cpu_maps_update_begin(); -- 1.8.3.1
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