Re: [PATCH v2 2/2] Do not change worker's running cpu incmci_rediscover().

From: Borislav Petkov
Date: Fri Oct 19 2012 - 12:42:27 EST


On Fri, Oct 19, 2012 at 01:45:28PM +0800, Tang Chen wrote:
> cmci_rediscover() used set_cpus_allowed_ptr() to change the current process's
> running cpu, and migrate itself to the dest cpu. But worker processes are not
> allowed to be migrated. If current is a worker, the worker will be migrated to
> another cpu, but the corresponding worker_pool is still on the original cpu.
>
> In this case, the following BUG_ON in try_to_wake_up_local() will be triggered:
> BUG_ON(rq != this_rq());
>
> This will cause the kernel panic.
>
> This patch removes the set_cpus_allowed_ptr() call, and put the cmci rediscover
> jobs onto all the other cpus using system_wq. This could bring some delay for
> the jobs.
>
> Signed-off-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
> Signed-off-by: Miao Xie <miaox@xxxxxxxxxxxxxx>

I guess this is ok. Tony?

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