linux-kernel - Re: [PATCH] acpi: fix 'return' with no value build warning

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Message-ID: <1596422456.22971.1.camel@mtkswgap22>
Date:   Mon, 3 Aug 2020 10:40:56 +0800
From:   Neal Liu <neal.liu@...iatek.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
CC:     Neal Liu <neal.liu@...iatek.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        linux-tegra <linux-tegra@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC..." 
        <linux-mediatek@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>,
        wsd_upstream <wsd_upstream@...iatek.com>
Subject: Re: [PATCH] acpi: fix 'return' with no value build warning

On Fri, 2020-07-31 at 13:33 +0200, Rafael J. Wysocki wrote:
> On Fri, Jul 31, 2020 at 5:39 AM Neal Liu <neal.liu@...iatek.com> wrote:
> >
> > Fixing CFI issue which introduced by commit efe9711214e6 is
> > incomplete.
> > Add return value to fix return-type build warning.
> >
> > Signed-off-by: Neal Liu <neal.liu@...iatek.com>
> 
> Applied with edited subject and changelog, but ->
> 
> > ---
> >  drivers/acpi/processor_idle.c |    4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
> > index 6ffb6c9..6870020 100644
> > --- a/drivers/acpi/processor_idle.c
> > +++ b/drivers/acpi/processor_idle.c
> > @@ -664,11 +664,11 @@ static int acpi_idle_enter_s2idle(struct cpuidle_device *dev,
> >                 struct acpi_processor *pr = __this_cpu_read(processors);
> >
> >                 if (unlikely(!pr))
> > -                       return;
> > +                       return -EFAULT;
> 
> -> there is no point returning an error code here, so I've made it
> just return 0.

return 0 is not matched with the meaning of contexts, but it's fine for
this patch.
Thanks !

> 
> >
> >                 if (pr->flags.bm_check) {
> >                         acpi_idle_enter_bm(pr, cx, false);
> > -                       return;
> > +                       return 0;
> >                 } else {
> >                         ACPI_FLUSH_CPU_CACHE();
> >                 }
> > --