Re: [Qemu-devel] [PATCH v1 4/7] target-arm: Implement pmccntr_sync function

[Christopher Covington <cov@codeaurora.org>]

On 06/23/2014 09:12 PM, Alistair Francis wrote:
> This is used to synchronise the PMCCNTR counter and swap its
> state between enabled and disabled if required. It must always
> be called twice, both before and after any logic that could
> change the state of the PMCCNTR counter.

> diff --git a/target-arm/cpu.h b/target-arm/cpu.h
> index 31aa09c..0984eda 100644
> --- a/target-arm/cpu.h
> +++ b/target-arm/cpu.h
> @@ -1051,6 +1051,17 @@ static inline bool cp_access_ok(int current_pl,
>  }
>  
>  /**
> + * pmccntr_sync
> + * @cpu: ARMCPU
> + *
> + * Syncronises the counter in the PMCCNTR. This must always be called twice,
> + * once before any action that might effect the timer and again afterwards.
> + * The fucntion is used to swap the state of the register if required.

Nit: function

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