linux-kernel - Re: [PATCH v2 4/4] platform/x86/amd: pmc: Use pm_pr

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Message-ID: <e9eb526d-84fe-b814-67a3-6f7977aa0078@redhat.com>
Date:   Tue, 23 May 2023 13:07:36 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Mario Limonciello <mario.limonciello@....com>, rafael@...nel.org,
        linus.walleij@...aro.org
Cc:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-pm@...r.kernel.org, Shyam-sundar.S-k@....com,
        Basavaraj.Natikar@....com
Subject: Re: [PATCH v2 4/4] platform/x86/amd: pmc: Use pm_pr_dbg() for suspend
 related messages

Hi Mario,

On 5/22/23 22:00, Mario Limonciello wrote:
> Using pm_pr_dbg() allows users to toggle `/sys/power/pm_debug_messages`
> as a single knob to turn on messages that amd-pmc can emit to aid in
> any s2idle debugging.
> 
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> ---
>  drivers/platform/x86/amd/pmc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/platform/x86/amd/pmc.c b/drivers/platform/x86/amd/pmc.c
> index 427905714f79..1304cd6f13f6 100644
> --- a/drivers/platform/x86/amd/pmc.c
> +++ b/drivers/platform/x86/amd/pmc.c
> @@ -543,7 +543,7 @@ static int amd_pmc_idlemask_read(struct amd_pmc_dev *pdev, struct device *dev,
>  	}
>  
>  	if (dev)
> -		dev_dbg(pdev->dev, "SMU idlemask s0i3: 0x%x\n", val);
> +		pm_pr_dbg("SMU idlemask s0i3: 0x%x\n", val);
>  
>  	if (s)
>  		seq_printf(s, "SMU idlemask : 0x%x\n", val);

This does not compile, amd/pmc.c may be build as an amd-pmc.ko module
and currently the pm_debug_messages_on flag used by pm_pr_dbg()
is not exported to modules:

  CC [M]  drivers/platform/x86/amd/pmc.o
  LD [M]  drivers/platform/x86/amd/amd-pmc.o
  MODPOST Module.symvers
ERROR: modpost: "pm_debug_messages_on" [drivers/platform/x86/amd/amd-pmc.ko] undefined!
make[1]: *** [scripts/Makefile.modpost:136: Module.symvers] Error 1
make: *** [Makefile:1978: modpost] Error 2

Regards,

Hans