linux-kernel - Re: [PATCH] firmware: qcom: qcm: fix unused qcom_scm_qseecom

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Date:   Mon, 20 Nov 2023 20:56:47 +0100
From:   Maximilian Luz <luzmaximilian@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Johan Hovold <johan+linaro@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] firmware: qcom: qcm: fix unused
 qcom_scm_qseecom_allowlist

On 11/20/23 19:56, Krzysztof Kozlowski wrote:
> For !OF builds, the qcom_scm_qseecom_allowlist is unused:
> 
>    drivers/firmware/qcom/qcom_scm.c:1652:34: error: ‘qcom_scm_qseecom_allowlist’ defined but not used [-Werror=unused-const-variable=]
> 
> Fixes: 00b1248606ba ("firmware: qcom_scm: Add support for Qualcomm Secure Execution Environment SCM interface")
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202311191654.S4wlVUrz-lkp@intel.com/
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> ---
>   drivers/firmware/qcom/qcom_scm.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
> index 520de9b5633a..ecdb367dc9b8 100644
> --- a/drivers/firmware/qcom/qcom_scm.c
> +++ b/drivers/firmware/qcom/qcom_scm.c
> @@ -1649,7 +1649,7 @@ EXPORT_SYMBOL_GPL(qcom_scm_qseecom_app_send);
>    * We do not yet support re-entrant calls via the qseecom interface. To prevent
>    + any potential issues with this, only allow validated machines for now.
>    */
> -static const struct of_device_id qcom_scm_qseecom_allowlist[] = {
> +static const struct of_device_id qcom_scm_qseecom_allowlist[] __maybe_unused = {
>   	{ .compatible = "lenovo,thinkpad-x13s", },
>   	{ }
>   };

Thanks! Given that we're right now only allowing qseecom clients to load
on devices within that list, maybe it would be cleaner to make
QCOM_QSEECOM depend on OF explicitly instead?

Anyway, I'm also fine with this solution.

Acked-by: Maximilian Luz <luzmaximilian@...il.com>