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

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Date:   Thu, 19 Sep 2019 21:38:41 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Arnd Bergmann <arnd@...db.de>
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

> Sent: Thursday, September 19, 2019 5:11 AM
> 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

You're correct. Thanks! 

I'll use " #ifdef CONFIG_PM_SLEEP ... #endif" instead.

The mentioned functions are only used in the micros
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS, which is empty if CONFIG_PM_SLEEP
is not defined. So it looks to me using "#ifdef CONFIG_PM_SLEEP ..." should
resolve the issue.

BTW, CONFIG_PM_SLEEP depends on CONFIG_PM, so if CONFIG_PM is not
defined, CONFIG_PM_SLEEP is not defined either.

Thanks,
-- Dexuan