linux-kernel - Re: [PATCH] spi: bcm63xx: remove PM_SLEEP based conditional compilation

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Message-ID: <ed33a2ee-9c94-818f-b4c0-bc0257207a2f@roeck-us.net>
Date:   Tue, 25 Apr 2023 10:37:24 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     "Gole, Dhruva" <d-gole@...com>
Cc:     Mark Brown <broonie@...nel.org>,
        Vaishnav Achath <vaishnav.a@...com>, Vignesh <vigneshr@...com>,
        Apurva Nandan <a-nandan@...com>,
        linux-arm-kernel@...ts.infradead.org, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Grant Likely <grant.likely@...retlab.ca>,
        Tanguy Bouzeloc <tanguy.bouzeloc@...xo.com>
Subject: Re: [PATCH] spi: bcm63xx: remove PM_SLEEP based conditional
 compilation

On 4/25/23 10:18, Gole, Dhruva wrote:
> Hi,
> 
> On 4/25/2023 8:38 PM, Guenter Roeck wrote:
>> On Thu, Apr 20, 2023 at 05:46:15PM +0530, Dhruva Gole wrote:
>>> Get rid of conditional compilation based on CONFIG_PM_SLEEP because
>>> it may introduce build issues with certain configs where it maybe disabled
>>> This is because if above config is not enabled the suspend-resume
>>> functions are never part of the code but the bcm63xx_spi_pm_ops struct
>>> still inits them to non-existent suspend-resume functions.
>>>
>>> Fixes: b42dfed83d95 ("spi: add Broadcom BCM63xx SPI controller driver")
>>>
>>> Signed-off-by: Dhruva Gole <d-gole@...com>
>> This patch results in:
>>
>> drivers/spi/spi-bcm63xx.c:632:12: error: 'bcm63xx_spi_resume' defined but not used [-Werror=unused-function]
>>    632 | static int bcm63xx_spi_resume(struct device *dev)
>>        |            ^~~~~~~~~~~~~~~~~~
>> drivers/spi/spi-bcm63xx.c:620:12: error: 'bcm63xx_spi_suspend' defined but not used [-Werror=unused-function]
>>    620 | static int bcm63xx_spi_suspend(struct device *dev)
>>
>> on architectures with no PM support (alpha, csky, m68k, openrisc, parisc,
>> riscv, s390).
> 
> Thanks for pointing this out.
> 
> I could send a patch to address this as pointed here [0]
> 
> by adding a __maybe_unused.
> 
> However, do you think my other patch [1] could address this issue without the need for above?
> 

Personally I would go for [0] as the least invasive solution, but I really
have no idea, sorry. I just hope that your (broken) patch doesn't make it
as-is into the upstream kernel.

Guenter

> I think it would because DEFINE_SIMPLE_DEV_PM_OPS doesn't seem to be under any conditional CONFIG_PM.
> 
> However, I may have missed something, please do let me know what's the best way to fix.
> 
> [0] https://lore.kernel.org/all/24ec3728-9720-ae6a-9ff5-3e2e13a96f76@gmail.com/
> 
> [1] https://lore.kernel.org/all/20230424102546.1604484-1-d-gole@ti.com/
> 
>>
>> Guenter
>