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author | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
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committer | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
commit | 871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch) | |
tree | 8718f573808810c2a1e8cb8fb6ac469093ca2784 /ANDROID_3.4.5/include/linux/stop_machine.h | |
parent | 9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff) | |
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.
Diffstat (limited to 'ANDROID_3.4.5/include/linux/stop_machine.h')
-rw-r--r-- | ANDROID_3.4.5/include/linux/stop_machine.h | 156 |
1 files changed, 0 insertions, 156 deletions
diff --git a/ANDROID_3.4.5/include/linux/stop_machine.h b/ANDROID_3.4.5/include/linux/stop_machine.h deleted file mode 100644 index 3b5e910d..00000000 --- a/ANDROID_3.4.5/include/linux/stop_machine.h +++ /dev/null @@ -1,156 +0,0 @@ -#ifndef _LINUX_STOP_MACHINE -#define _LINUX_STOP_MACHINE - -#include <linux/cpu.h> -#include <linux/cpumask.h> -#include <linux/smp.h> -#include <linux/list.h> - -/* - * stop_cpu[s]() is simplistic per-cpu maximum priority cpu - * monopolization mechanism. The caller can specify a non-sleeping - * function to be executed on a single or multiple cpus preempting all - * other processes and monopolizing those cpus until it finishes. - * - * Resources for this mechanism are preallocated when a cpu is brought - * up and requests are guaranteed to be served as long as the target - * cpus are online. - */ -typedef int (*cpu_stop_fn_t)(void *arg); - -#ifdef CONFIG_SMP - -struct cpu_stop_work { - struct list_head list; /* cpu_stopper->works */ - cpu_stop_fn_t fn; - void *arg; - struct cpu_stop_done *done; -}; - -int stop_one_cpu(unsigned int cpu, cpu_stop_fn_t fn, void *arg); -void stop_one_cpu_nowait(unsigned int cpu, cpu_stop_fn_t fn, void *arg, - struct cpu_stop_work *work_buf); -int stop_cpus(const struct cpumask *cpumask, cpu_stop_fn_t fn, void *arg); -int try_stop_cpus(const struct cpumask *cpumask, cpu_stop_fn_t fn, void *arg); - -#else /* CONFIG_SMP */ - -#include <linux/workqueue.h> - -struct cpu_stop_work { - struct work_struct work; - cpu_stop_fn_t fn; - void *arg; -}; - -static inline int stop_one_cpu(unsigned int cpu, cpu_stop_fn_t fn, void *arg) -{ - int ret = -ENOENT; - preempt_disable(); - if (cpu == smp_processor_id()) - ret = fn(arg); - preempt_enable(); - return ret; -} - -static void stop_one_cpu_nowait_workfn(struct work_struct *work) -{ - struct cpu_stop_work *stwork = - container_of(work, struct cpu_stop_work, work); - preempt_disable(); - stwork->fn(stwork->arg); - preempt_enable(); -} - -static inline void stop_one_cpu_nowait(unsigned int cpu, - cpu_stop_fn_t fn, void *arg, - struct cpu_stop_work *work_buf) -{ - if (cpu == smp_processor_id()) { - INIT_WORK(&work_buf->work, stop_one_cpu_nowait_workfn); - work_buf->fn = fn; - work_buf->arg = arg; - schedule_work(&work_buf->work); - } -} - -static inline int stop_cpus(const struct cpumask *cpumask, - cpu_stop_fn_t fn, void *arg) -{ - if (cpumask_test_cpu(raw_smp_processor_id(), cpumask)) - return stop_one_cpu(raw_smp_processor_id(), fn, arg); - return -ENOENT; -} - -static inline int try_stop_cpus(const struct cpumask *cpumask, - cpu_stop_fn_t fn, void *arg) -{ - return stop_cpus(cpumask, fn, arg); -} - -#endif /* CONFIG_SMP */ - -/* - * stop_machine "Bogolock": stop the entire machine, disable - * interrupts. This is a very heavy lock, which is equivalent to - * grabbing every spinlock (and more). So the "read" side to such a - * lock is anything which disables preemption. - */ -#if defined(CONFIG_STOP_MACHINE) && defined(CONFIG_SMP) - -/** - * stop_machine: freeze the machine on all CPUs and run this function - * @fn: the function to run - * @data: the data ptr for the @fn() - * @cpus: the cpus to run the @fn() on (NULL = any online cpu) - * - * Description: This causes a thread to be scheduled on every cpu, - * each of which disables interrupts. The result is that no one is - * holding a spinlock or inside any other preempt-disabled region when - * @fn() runs. - * - * This can be thought of as a very heavy write lock, equivalent to - * grabbing every spinlock in the kernel. */ -int stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus); - -/** - * __stop_machine: freeze the machine on all CPUs and run this function - * @fn: the function to run - * @data: the data ptr for the @fn - * @cpus: the cpus to run the @fn() on (NULL = any online cpu) - * - * Description: This is a special version of the above, which assumes cpus - * won't come or go while it's being called. Used by hotplug cpu. - */ -int __stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus); - -int stop_machine_from_inactive_cpu(int (*fn)(void *), void *data, - const struct cpumask *cpus); - -#else /* CONFIG_STOP_MACHINE && CONFIG_SMP */ - -static inline int __stop_machine(int (*fn)(void *), void *data, - const struct cpumask *cpus) -{ - unsigned long flags; - int ret; - local_irq_save(flags); - ret = fn(data); - local_irq_restore(flags); - return ret; -} - -static inline int stop_machine(int (*fn)(void *), void *data, - const struct cpumask *cpus) -{ - return __stop_machine(fn, data, cpus); -} - -static inline int stop_machine_from_inactive_cpu(int (*fn)(void *), void *data, - const struct cpumask *cpus) -{ - return __stop_machine(fn, data, cpus); -} - -#endif /* CONFIG_STOP_MACHINE && CONFIG_SMP */ -#endif /* _LINUX_STOP_MACHINE */ |