linux-kernel - Re: [PATCH 08/14] soc: qcom: smem: Add qcom_smem_is

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Date:   Mon, 5 Jun 2023 20:53:21 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Stephan Gerhold <stephan@...hold.net>,
        Bjorn Andersson <andersson@...nel.org>
Cc:     Andy Gross <agross@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-remoteproc@...r.kernel.org
Subject: Re: [PATCH 08/14] soc: qcom: smem: Add qcom_smem_is_available()



On 5.06.2023 09:08, Stephan Gerhold wrote:
> Avoid having to look up a dummy item from SMEM to detect if it is
> already available or if we need to defer probing.
> 
> Signed-off-by: Stephan Gerhold <stephan@...hold.net>
> ---
>  drivers/soc/qcom/smem.c       | 9 +++++++++
>  include/linux/soc/qcom/smem.h | 1 +
>  2 files changed, 10 insertions(+)
> 
> diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
> index b0d59e815c3b..3d93a6681494 100644
> --- a/drivers/soc/qcom/smem.c
> +++ b/drivers/soc/qcom/smem.c
> @@ -359,6 +359,15 @@ static struct qcom_smem *__smem;
>  /* Timeout (ms) for the trylock of remote spinlocks */
>  #define HWSPINLOCK_TIMEOUT	1000
>  
> +/**
> + * qcom_smem_is_available() - Checks if SMEM is available
> + */
Shouldn't kerneldoc explicitly say "returns x if y else z"?

Modulo that:

Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Konrad
> +bool qcom_smem_is_available(void)
> +{
> +	return !!__smem;
> +}
> +EXPORT_SYMBOL(qcom_smem_is_available);
> +
>  static int qcom_smem_alloc_private(struct qcom_smem *smem,
>  				   struct smem_partition *part,
>  				   unsigned item,
> diff --git a/include/linux/soc/qcom/smem.h b/include/linux/soc/qcom/smem.h
> index 223db6a9c733..a36a3b9d4929 100644
> --- a/include/linux/soc/qcom/smem.h
> +++ b/include/linux/soc/qcom/smem.h
> @@ -4,6 +4,7 @@
>  
>  #define QCOM_SMEM_HOST_ANY -1
>  
> +bool qcom_smem_is_available(void);
>  int qcom_smem_alloc(unsigned host, unsigned item, size_t size);
>  void *qcom_smem_get(unsigned host, unsigned item, size_t *size);
>  
>