Will replace the misnomed cpu_idle_wait() function which is copied a gazillion times all over arch/* Signed-off-by: Thomas Gleixner --- include/linux/smp.h | 4 ++++ kernel/smp.c | 23 +++++++++++++++++++++++ 2 files changed, 27 insertions(+) Index: tip/include/linux/smp.h =================================================================== --- tip.orig/include/linux/smp.h +++ tip/include/linux/smp.h @@ -81,6 +81,8 @@ void __smp_call_function_single(int cpui int smp_call_function_any(const struct cpumask *mask, smp_call_func_t func, void *info, int wait); +void kick_all_cpus_sync(void); + /* * Generic and arch helpers */ @@ -192,6 +194,8 @@ smp_call_function_any(const struct cpuma return smp_call_function_single(0, func, info, wait); } +static inline void kick_all_cpus_sync(void) { } + #endif /* !SMP */ /* Index: tip/kernel/smp.c =================================================================== --- tip.orig/kernel/smp.c +++ tip/kernel/smp.c @@ -795,3 +795,26 @@ void on_each_cpu_cond(bool (*cond_func)( } } EXPORT_SYMBOL(on_each_cpu_cond); + +static void do_nothing(void *unused) +{ +} + +/** + * kick_all_cpus_sync - Force all cpus out of idle + * + * Used to synchronize the update of pm_idle function pointer. It's + * called after the pointer is updated and returns after the dummy + * callback function has been executed on all cpus. The execution of + * the function can only happen on the remote cpus after they have + * left the idle function which had been called via pm_idle function + * pointer. So it's guaranteed that nothing uses the previous pointer + * anymore. + */ +void kick_all_cpus_sync(void) +{ + /* Make sure the change is visible before we kick the cpus */ + smp_mb(); + smp_call_function(do_nothing, NULL, 1); +} +EXPORT_SYMBOL_GPL(kick_all_cpus_sync); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/