Messages in this thread | | | From | Dexuan Cui <> | Subject | RE: [PATCH] Drivers: hv: vmbus: Fix harmless building warnings without CONFIG_PM | Date | Fri, 20 Sep 2019 21:02:16 +0000 |
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> From: Arnd Bergmann <arnd@arndb.de> > Sent: Friday, September 20, 2019 12:33 AM > On Thu, Sep 19, 2019 at 11:38 PM Dexuan Cui <decui@microsoft.com> wrote: > > > Sent: Thursday, September 19, 2019 5:11 AM > > > On Thu, Sep 19, 2019 at 7:19 AM Dexuan Cui <decui@microsoft.com> > wrote: > > > > 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. > > > > 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. > > Probably, yes. There are sometimes surprising effects, such as when one of the > functions inside of the #ifdef call another function that is otherwise unused.
I reviewed the related functions again and I believe with the v2 we don't have such an issue as you described here.
> I would normally try to build a few hundred randconfig builds to be fairly sure > of a change like this, or use __maybe_unused like most other drivers do here. > > Arnd
I do see a lot of drivers using __maybe_unused, but IMO conditional compilation is slightly better. In case conditional compilation still has some unexpected issue, we can always make a further fix. :-)
Thanks, -- Dexuan
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