Added a few more people - as this patch touches a core file.
I expect we have an issue on sparc32 - that manifest
in this bug. But I do not know this code at all.
Sam
On Thu, Apr 19, 2012 at 11:22:42AM +0200, Konrad Eisele wrote:
> The stopper thread for CPU > 0 (at least in sparc32)
> has on initialization task_cpu() set to zero even
> for CPUs > 0. The patch explicitly checks weather the
> CPU is allowed to run on the cpu that task_cpu()
> return or changes the return cpu.
>
> Signed-off-by: Konrad Eisele <konrad@xxxxxxxxxxx>
> ---
> kernel/sched/stop_task.c | 9 ++++++++-
> 1 files changed, 8 insertions(+), 1 deletions(-)
>
> diff --git a/kernel/sched/stop_task.c b/kernel/sched/stop_task.c
> index 7b386e8..9201866 100644
> --- a/kernel/sched/stop_task.c
> +++ b/kernel/sched/stop_task.c
> @@ -13,7 +13,14 @@
> static int
> select_task_rq_stop(struct task_struct *p, int sd_flag, int flags)
> {
> - return task_cpu(p); /* stop tasks as never migrate */
> + int ccpu, cpu , dcpu;
> + ccpu = cpu = task_cpu(p);
> + if (unlikely(!cpumask_test_cpu(cpu, tsk_cpus_allowed(p)))) {
> + cpu = cpumask_first(tsk_cpus_allowed(p));
> + if (cpu >= nr_cpu_ids)
> + cpu = ccpu;
> + }
> + return cpu;
> }
> #endif /* CONFIG_SMP */
>
> --
> 1.6.1.3
>
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