netdev - Re: [PATCH net-next] mlx4: Mark PM functions as __maybe

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Date:   Thu, 2 Jul 2020 18:27:12 +0800
From:   Wei Yongjun <weiyongjun1@...wei.com>
To:     Leon Romanovsky <leon@...nel.org>
CC:     Hulk Robot <hulkci@...wei.com>, Tariq Toukan <tariqt@...lanox.com>,
        "Jakub Kicinski" <kuba@...nel.org>,
        Vaibhav Gupta <vaibhavgupta40@...il.com>,
        <netdev@...r.kernel.org>, <linux-rdma@...r.kernel.org>
Subject: Re: [PATCH net-next] mlx4: Mark PM functions as __maybe_unused



On 2020/7/2 17:36, Leon Romanovsky wrote:
> On Thu, Jul 02, 2020 at 05:19:46PM +0800, Wei Yongjun wrote:
>> In certain configurations without power management support, the
>> following warnings happen:
>>
>> drivers/net/ethernet/mellanox/mlx4/main.c:4388:12:
>>  warning: 'mlx4_resume' defined but not used [-Wunused-function]
>>  4388 | static int mlx4_resume(struct device *dev_d)
>>       |            ^~~~~~~~~~~
>> drivers/net/ethernet/mellanox/mlx4/main.c:4373:12: warning:
>>  'mlx4_suspend' defined but not used [-Wunused-function]
>>  4373 | static int mlx4_suspend(struct device *dev_d)
>>       |            ^~~~~~~~~~~~
>>
>> Mark these functions as __maybe_unused to make it clear to the
>> compiler that this is going to happen based on the configuration,
>> which is the standard for these types of functions.
>>
>> Fixes: 0e3e206a3e12 ("mlx4: use generic power management")
> 
> I can't find this SHA-1, where did you get it?

It is in the net-next tree.

https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=0e3e206a3e12

> And why doesn't mlx5 need this change?
> 
> Fixes: 86a3e5d02c20 ("net/mlx4_core: Add PCI calls for suspend/resume")
> 
> Thanks
>