linux-kernel - Re: [PATCH v11 2/9] ACPI: Adjust #ifdef for *_lps0

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Date:   Tue, 15 Aug 2023 13:32:05 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-acpi@...r.kernel.org,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Iain Lane <iain@...ngesquash.org.uk>,
        Shyam-sundar S-k <Shyam-sundar.S-k@....com>
Subject: Re: [PATCH v11 2/9] ACPI: Adjust #ifdef for *_lps0_dev use

On 8/15/2023 13:28, Bjorn Helgaas wrote:
> On Wed, Aug 09, 2023 at 01:54:46PM -0500, Mario Limonciello wrote:
>> The #ifdef currently is guarded against CONFIG_X86, but these are
>> actually sleep related functions so they should be tied to
>> CONFIG_ACPI_SLEEP.
>>
>> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
>> ---
>> v9->v10:
>>   * split from other patches
>> ---
>>   include/linux/acpi.h | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
>> index 0d5277b7c6323..13a0fca3539f0 100644
>> --- a/include/linux/acpi.h
>> +++ b/include/linux/acpi.h
>> @@ -1100,7 +1100,7 @@ void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
>>   
>>   acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state,
>>   					   u32 val_a, u32 val_b);
>> -#ifdef CONFIG_X86
>> +#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
> 
> What's the connection to CONFIG_ACPI_SLEEP?
> 
> The acpi_register_lps0_dev() implementation in
> drivers/acpi/x86/s2idle.c is under #ifdef CONFIG_SUSPEND (and
> obviously s2idle.c is only compiled at all if CONFIG_X86).
> 
> Both callers (amd_pmc_probe() and thinkpad_acpi_module_init()) are
> under #ifdef CONFIG_SUSPEND.
> 

My thought process was that s2idle.c is from drivers/acpi/x86 and only 
can be used in the context of ACPI enabled sleep.

But I could see the argument for CONFIG_SUSPEND being stronger.  I'll 
adjust and make sure the rest of the series works with CONFIG_SUSPEND.

Thanks,

>>   struct acpi_s2idle_dev_ops {
>>   	struct list_head list_node;
>>   	void (*prepare)(void);
>> @@ -1109,7 +1109,7 @@ struct acpi_s2idle_dev_ops {
>>   };
>>   int acpi_register_lps0_dev(struct acpi_s2idle_dev_ops *arg);
>>   void acpi_unregister_lps0_dev(struct acpi_s2idle_dev_ops *arg);
>> -#endif /* CONFIG_X86 */
>> +#endif /* CONFIG_ACPI_SLEEP && CONFIG_X86 */
>>   #ifndef CONFIG_IA64
>>   void arch_reserve_mem_area(acpi_physical_address addr, size_t size);
>>   #else
>> -- 
>> 2.34.1
>>