diff options
| author | Lai Jiangshan <laijs@cn.fujitsu.com> | 2014-05-16 11:50:42 +0800 |
|---|---|---|
| committer | Show Liu <show.liu@linaro.org> | 2014-06-18 12:05:24 +0800 |
| commit | ccdbf63dc46377d8dc921b948fc073a4ded3348c (patch) | |
| tree | 7b6248290cc86ea3d31f1d9cfbf5df427a637295 | |
| parent | 4c5ccfe1cd13cfbb417f8ff2183bf53a8c4fabb5 (diff) | |
sched: Fix hotplug vs. set_cpus_allowed_ptr()
commit 6acbfb96976fc3350e30d964acb1dbbdf876d55e upstream.
Lai found that:
WARNING: CPU: 1 PID: 13 at arch/x86/kernel/smp.c:124 native_smp_send_reschedule+0x2d/0x4b()
...
migration_cpu_stop+0x1d/0x22
was caused by set_cpus_allowed_ptr() assuming that cpu_active_mask is
always a sub-set of cpu_online_mask.
This isn't true since 5fbd036b552f ("sched: Cleanup cpu_active madness").
So set active and online at the same time to avoid this particular
problem.
Fixes: 5fbd036b552f ("sched: Cleanup cpu_active madness")
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael wang <wangyun@linux.vnet.ibm.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Toshi Kani <toshi.kani@hp.com>
Link: http://lkml.kernel.org/r/53758B12.8060609@cn.fujitsu.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | kernel/cpu.c | 6 | ||||
| -rw-r--r-- | kernel/sched/core.c | 1 |
2 files changed, 4 insertions, 3 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c index 2434ed358ee..436a93bae9e 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -692,10 +692,12 @@ void set_cpu_present(unsigned int cpu, bool present) void set_cpu_online(unsigned int cpu, bool online) { - if (online) + if (online) { cpumask_set_cpu(cpu, to_cpumask(cpu_online_bits)); - else + cpumask_set_cpu(cpu, to_cpumask(cpu_active_bits)); + } else { cpumask_clear_cpu(cpu, to_cpumask(cpu_online_bits)); + } } void set_cpu_active(unsigned int cpu, bool active) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 1a3f5b92b19..0995514ee83 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -5075,7 +5075,6 @@ static int sched_cpu_active(struct notifier_block *nfb, unsigned long action, void *hcpu) { switch (action & ~CPU_TASKS_FROZEN) { - case CPU_STARTING: case CPU_DOWN_FAILED: set_cpu_active((long)hcpu, true); return NOTIFY_OK; |