Re: [PATCH 1/3] cpuidle: Add enable_cpuidle() interface

[lihuisong (C)]

On 1/15/2026 3:18 AM, Rafael J. Wysocki wrote:
> On Tue, Nov 25, 2025 at 8:29 AM Huisong Li <lihuisong@xxxxxxxxxx> wrote:
> > The global switch of cpuidle can be turned back on in some case.
> > So add enable_cpuidle().
> No, this is not going to work.  The "off" switch only affects
> initialization AFAICS.
I think it would be work.
The cpuidle_not_available() also see the "off" on do_idle().
And cpuidle_idle_call() check this function first and then select idle 
state.
Cpuidle doesn't select and enter idle state if this fuction return true.
> > Signed-off-by: Huisong Li <lihuisong@xxxxxxxxxx>
> > ---
> >   drivers/cpuidle/cpuidle.c | 5 ++++-
> >   include/linux/cpuidle.h   | 2 ++
> >   2 files changed, 6 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
> > index 56132e843c99..980ddfd3d930 100644
> > --- a/drivers/cpuidle/cpuidle.c
> > +++ b/drivers/cpuidle/cpuidle.c
> > @@ -48,7 +48,10 @@ void disable_cpuidle(void)
> >   {
> >          off = 1;
> >   }
> > -
> > +void enable_cpuidle(void)
> > +{
> > +       off = 0;
> > +}
> >   bool cpuidle_not_available(struct cpuidle_driver *drv,
> >                             struct cpuidle_device *dev)
> >   {
> > diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
> > index a9ee4fe55dcf..94c030748af3 100644
> > --- a/include/linux/cpuidle.h
> > +++ b/include/linux/cpuidle.h
> > @@ -168,6 +168,7 @@ struct cpuidle_driver {
> >   };
> >
> >   #ifdef CONFIG_CPU_IDLE
> > +extern void enable_cpuidle(void);
> >   extern void disable_cpuidle(void);
> >   extern bool cpuidle_not_available(struct cpuidle_driver *drv,
> >                                    struct cpuidle_device *dev);
> > @@ -203,6 +204,7 @@ extern struct cpuidle_driver *cpuidle_get_cpu_driver(struct cpuidle_device *dev)
> >   static inline struct cpuidle_device *cpuidle_get_device(void)
> >   {return __this_cpu_read(cpuidle_devices); }
> >   #else
> > +static inline void enable_cpuidle(void) { }
> >   static inline void disable_cpuidle(void) { }
> >   static inline bool cpuidle_not_available(struct cpuidle_driver *drv,
> >                                           struct cpuidle_device *dev)
> > --
> > 2.33.0