linux-kernel - Re: [PATCH] mailbox: qcom-ipcc: Fix -Wunused-function with CONFIG_PM

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Date:   Tue, 24 May 2022 15:44:59 +0530
From:   Sibi Sankar <quic_sibis@...cinc.com>
To:     Nathan Chancellor <nathan@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Jassi Brar <jassisinghbrar@...il.com>
CC:     Prasad Sodagudi <quic_psodagud@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <patches@...ts.linux.dev>
Subject: Re: [PATCH] mailbox: qcom-ipcc: Fix -Wunused-function with
 CONFIG_PM_SLEEP=n

Hey Nathan,
Thanks for the fix!

On 5/24/22 4:17 AM, Nathan Chancellor wrote:
> When CONFIG_PM_SLEEP is not set, there is a warning that
> qcom_ipcc_pm_resume() is unused:
> 
>    drivers/mailbox/qcom-ipcc.c:258:12: error: 'qcom_ipcc_pm_resume' defined but not used [-Werror=unused-function]
>      258 | static int qcom_ipcc_pm_resume(struct device *dev)
>          |            ^~~~~~~~~~~~~~~~~~~
>    cc1: all warnings being treated as errors
> 
> Commit 1a3c7bb08826 ("PM: core: Add new *_PM_OPS macros, deprecate old
> ones") reworked the PM_OPS macros to avoid this problem. Use
> NOIRQ_SYSTEM_SLEEP_PM_OPS directly so that qcom_ipcc_pm_resume() always
> appears to be used to the compiler, even though it will be dead code
> eliminated in the !CONFIG_PM_SLEEP case.
> 
> Fixes: c25f77899753 ("mailbox: qcom-ipcc: Log the pending interrupt during resume")
> Signed-off-by: Nathan Chancellor <nathan@...nel.org>

Reviewed-by: Sibi Sankar <quic_sibis@...cinc.com>

> ---
>   drivers/mailbox/qcom-ipcc.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mailbox/qcom-ipcc.c b/drivers/mailbox/qcom-ipcc.c
> index 2583b20cdeb7..31d58b7d55fe 100644
> --- a/drivers/mailbox/qcom-ipcc.c
> +++ b/drivers/mailbox/qcom-ipcc.c
> @@ -344,7 +344,7 @@ static const struct of_device_id qcom_ipcc_of_match[] = {
>   MODULE_DEVICE_TABLE(of, qcom_ipcc_of_match);
>   
>   static const struct dev_pm_ops qcom_ipcc_dev_pm_ops = {
> -	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(NULL, qcom_ipcc_pm_resume)
> +	NOIRQ_SYSTEM_SLEEP_PM_OPS(NULL, qcom_ipcc_pm_resume)
>   };
>   
>   static struct platform_driver qcom_ipcc_driver = {
> 
> base-commit: bca1a1004615efe141fd78f360ecc48c60bc4ad5
>