Messages in this thread | | | Date | Tue, 14 Aug 2012 21:21:50 +0800 | From | Feng Tang <> | Subject | Re: [PATCH RFC] tick: Emphasize tck_broadcast_on_off could only be called for host cpu |
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On Tue, 31 Jul 2012 15:57:21 +0800 Feng Tang <feng.tang@intel.com> wrote:
> With current tick_do_broadcast_on_off() and tick_broadcast_on_off(), > it only cares host cpu, and doesn't really support to make the on/off > for another target CPU as it seems to be. So remove the unneeded > online check and add a WARN to notify user who doesn't know this > new usage model. > > Next step should be to remove those cases that sends the BROADCAST > ON/OFF/FORCE msg on one cpu for another CPU, if this patch is reviewed > to be ok. > > Signed-off-by: Feng Tang <feng.tang@intel.com> > Cc: Suresh Siddha <suresh.b.siddha@intel.com> > Cc: Thomas Gleixner <tglx@linutronix.de> > --- > kernel/time/tick-broadcast.c | 15 +-------------- > kernel/time/tick-common.c | 6 +++++- > kernel/time/tick-internal.h | 4 ++-- > 3 files changed, 8 insertions(+), 17 deletions(-) > > diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c > index f113755..0433274 100644 > --- a/kernel/time/tick-broadcast.c > +++ b/kernel/time/tick-broadcast.c > @@ -204,7 +204,7 @@ static void tick_handle_periodic_broadcast(struct clock_event_device *dev) > * Powerstate information: The system enters/leaves a state, where > * affected devices might stop > */ > -static void tick_do_broadcast_on_off(unsigned long *reason) > +void tick_broadcast_on_off(unsigned long *reason) > { > struct clock_event_device *bc, *dev; > struct tick_device *td; > @@ -266,19 +266,6 @@ out: > } > > /* > - * Powerstate information: The system enters/leaves a state, where > - * affected devices might stop. > - */ > -void tick_broadcast_on_off(unsigned long reason, int *oncpu) > -{ > - if (!cpumask_test_cpu(*oncpu, cpu_online_mask)) > - printk(KERN_ERR "tick-broadcast: ignoring broadcast for " > - "offline CPU #%d\n", *oncpu); > - else > - tick_do_broadcast_on_off(&reason); > -} > - > -/* > * Set the periodic handler depending on broadcast on/off > */ > void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast) > diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c > index da6c9ec..950c635 100644 > --- a/kernel/time/tick-common.c > +++ b/kernel/time/tick-common.c > @@ -362,6 +362,8 @@ static void tick_resume(void) > static int tick_notify(struct notifier_block *nb, unsigned long reason, > void *dev) > { > + int *cpu = dev; > + > switch (reason) { > > case CLOCK_EVT_NOTIFY_ADD: > @@ -370,7 +372,9 @@ static int tick_notify(struct notifier_block *nb, unsigned long reason, > case CLOCK_EVT_NOTIFY_BROADCAST_ON: > case CLOCK_EVT_NOTIFY_BROADCAST_OFF: > case CLOCK_EVT_NOTIFY_BROADCAST_FORCE: > - tick_broadcast_on_off(reason, dev); > + WARN((*cpu != smp_processor_id()), > + "BROADCAST ON/OFF/FORCE should only be fired for host CPU\n"); > + tick_broadcast_on_off(&reason); > break; > > case CLOCK_EVT_NOTIFY_BROADCAST_ENTER: > diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h > index 4e265b9..40e4a8b 100644 > --- a/kernel/time/tick-internal.h > +++ b/kernel/time/tick-internal.h > @@ -90,7 +90,7 @@ static inline bool tick_broadcast_oneshot_available(void) { return false; } > extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu); > extern int tick_check_broadcast_device(struct clock_event_device *dev); > extern int tick_is_broadcast_device(struct clock_event_device *dev); > -extern void tick_broadcast_on_off(unsigned long reason, int *oncpu); > +extern void tick_broadcast_on_off(unsigned long *reason); > extern void tick_shutdown_broadcast(unsigned int *cpup); > extern void tick_suspend_broadcast(void); > extern int tick_resume_broadcast(void); > @@ -115,7 +115,7 @@ static inline int tick_device_uses_broadcast(struct clock_event_device *dev, > return 0; > } > static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { } > -static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { } > +static inline void tick_broadcast_on_off(unsigned long *reason) { } > static inline void tick_shutdown_broadcast(unsigned int *cpup) { } > static inline void tick_suspend_broadcast(void) { } > static inline int tick_resume_broadcast(void) { return 0; }
Ping for comments.
Thanks, Feng
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