diff options
| author | Michael Ellerman <[email protected]> | 2014-05-23 18:15:28 +1000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <[email protected]> | 2014-05-28 13:35:36 +1000 |
| commit | 6f5e40a3001d2497a134386a173e3ec3fdf2ad0b (patch) | |
| tree | 13066084106667f6e2f16396566b5f61c138af41 | |
| parent | 5853aef1ac5c5d83076203e840ca463857a7515d (diff) | |
powerpc: Check cpu_thread_in_subcore() in __cpu_up()
To support split core we need to change the check in __cpu_up() that
determines if a cpu is allowed to come online.
Currently we refuse to online cpus which are not the primary thread
within their core.
On POWER8 with split core support this check needs to instead refuse to
online cpus which are not the primary thread within their *sub* core.
On POWER7 and other systems that do not support split core,
threads_per_subcore == threads_per_core and so the check is equivalent.
Signed-off-by: Michael Ellerman <[email protected]>
Signed-off-by: Michael Neuling <[email protected]>
Signed-off-by: Benjamin Herrenschmidt <[email protected]>
| -rw-r--r-- | arch/powerpc/kernel/smp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c index 5cdd9eb3b24c..6af946e9a984 100644 --- a/arch/powerpc/kernel/smp.c +++ b/arch/powerpc/kernel/smp.c @@ -490,7 +490,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle) * Don't allow secondary threads to come online if inhibited */ if (threads_per_core > 1 && secondaries_inhibited() && - cpu % threads_per_core != 0) + cpu_thread_in_subcore(cpu)) return -EBUSY; if (smp_ops == NULL || |