Re: [Qemu-devel] [PATCH v6 02/11] exec: Remove cpu from cpus list during cpu_exec_exit()

[David Gibson <david@gibson.dropbear.id.au>]

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On Fri, Jan 08, 2016 at 12:25:10PM +0530, Bharata B Rao wrote:
> CPUState *cpu gets added to the cpus list during cpu_exec_init(). It
> should be removed from cpu_exec_exit().
> 
> cpu_exec_init() is called from generic CPU::instance_finalize and some
> archs like PowerPC call it from CPU unrealizefn. So ensure that we
> dequeue the cpu only once.
> 
> Now -1 value for cpu->cpu_index indicates that we have already dequeued
> the cpu for CONFIG_USER_ONLY case also.
> 
> Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>

> ---
>  exec.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/exec.c b/exec.c
> index 8718a75..25c0f36 100644
> --- a/exec.c
> +++ b/exec.c
> @@ -578,6 +578,7 @@ void cpu_exec_exit(CPUState *cpu)
>          return;
>      }
>  
> +    QTAILQ_REMOVE(&cpus, cpu, node);
>      bitmap_clear(cpu_index_map, cpu->cpu_index, 1);
>      cpu->cpu_index = -1;
>  }
> @@ -596,6 +597,15 @@ static int cpu_get_free_index(Error **errp)
>  
>  void cpu_exec_exit(CPUState *cpu)
>  {
> +    cpu_list_lock();
> +    if (cpu->cpu_index == -1) {
> +        cpu_list_unlock();
> +        return;
> +    }
> +
> +    QTAILQ_REMOVE(&cpus, cpu, node);
> +    cpu->cpu_index = -1;
> +    cpu_list_unlock();
>  }
>  #endif
>  

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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