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

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Message-ID: <20200702115821.GC4837@unreal>
Date:   Thu, 2 Jul 2020 14:58:21 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Wei Yongjun <weiyongjun1@...wei.com>
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 Thu, Jul 02, 2020 at 06:27:12PM +0800, Wei Yongjun wrote:
>
>
> 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

I see, thanks

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