linux-kernel - Re: [PATCH] Drivers: hv: vmbus: Fix harmless building warnings without CONFIG

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Date:   Thu, 19 Sep 2019 14:10:42 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Dexuan Cui <decui@...rosoft.com>
Cc:     KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "sashal@...nel.org" <sashal@...nel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Michael Kelley <mikelley@...rosoft.com>
Subject: Re: [PATCH] Drivers: hv: vmbus: Fix harmless building warnings
 without CONFIG_PM

On Thu, Sep 19, 2019 at 7:19 AM Dexuan Cui <decui@...rosoft.com> wrote:
>
> If CONFIG_PM is not set, we can comment out these functions to avoid the
> below warnings:
>
> drivers/hv/vmbus_drv.c:2208:12: warning: ‘vmbus_bus_resume’ defined but not used [-Wunused-function]
> drivers/hv/vmbus_drv.c:2128:12: warning: ‘vmbus_bus_suspend’ defined but not used [-Wunused-function]
> drivers/hv/vmbus_drv.c:937:12: warning: ‘vmbus_resume’ defined but not used [-Wunused-function]
> drivers/hv/vmbus_drv.c:918:12: warning: ‘vmbus_suspend’ defined but not used [-Wunused-function]
>
> Fixes: 271b2224d42f ("Drivers: hv: vmbus: Implement suspend/resume for VSC drivers for hibernation")
> Fixes: f53335e3289f ("Drivers: hv: vmbus: Suspend/resume the vmbus itself for hibernation")
> Reported-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Dexuan Cui <decui@...rosoft.com>

I think this will still produce a warning if CONFIG_PM is set but
CONFIG_PM_SLEEP is not, possibly in other configurations as
well.

      Arnd