[ltt-dev] [PATCH 08/10] Return -EEXIST when the old cpu call_rcu_data has not been removed

[Mathieu Desnoyers]

* Lai Jiangshan (laijs at cn.fujitsu.com) wrote:
> To make it matches the comments.
> 
> It is the caller's responsibility to use
> set_cpu_call_rcu_data(cpu, NULL) to remove the CPU's
> call_rcu_data structure and dispose it.

Merged, thanks!

Mathieu

> 
> Signed-off-by: Lai Jiangshan <laijs at cn.fujitsu.com>
> ---
>  urcu-call-rcu-impl.h |    8 ++++++++
>  1 files changed, 8 insertions(+), 0 deletions(-)
> 
> diff --git a/urcu-call-rcu-impl.h b/urcu-call-rcu-impl.h
> index c822646..ae93468 100644
> --- a/urcu-call-rcu-impl.h
> +++ b/urcu-call-rcu-impl.h
> @@ -396,11 +396,19 @@ int set_cpu_call_rcu_data(int cpu, struct call_rcu_data *crdp)
>  		errno = EINVAL;
>  		return -EINVAL;
>  	}
> +
>  	if (per_cpu_call_rcu_data == NULL) {
>  		call_rcu_unlock(&call_rcu_mutex);
>  		errno = ENOMEM;
>  		return -ENOMEM;
>  	}
> +
> +	if (per_cpu_call_rcu_data[cpu] != NULL && crdp != NULL) {
> +		call_rcu_unlock(&call_rcu_mutex);
> +		errno = EEXIST;
> +		return -EEXIST;
> +	}
> +
>  	per_cpu_call_rcu_data[cpu] = crdp;
>  	call_rcu_unlock(&call_rcu_mutex);
>  	return 0;
> -- 
> 1.7.4.4
> 

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com