1 #ifndef _LINUX_STOP_MACHINE
2 #define _LINUX_STOP_MACHINE
3 /* "Bogolock": stop the entire machine, disable interrupts. This is a
4 very heavy lock, which is equivalent to grabbing every spinlock
5 (and more). So the "read" side to such a lock is anything which
8 #include <asm/system.h>
10 #if defined(CONFIG_STOP_MACHINE) && defined(CONFIG_SMP)
15 * stop_machine_run: freeze the machine on all CPUs and run this function
16 * @fn: the function to run
17 * @data: the data ptr for the @fn()
18 * @cpu: if @cpu == n, run @fn() on cpu n
19 * if @cpu == NR_CPUS, run @fn() on any cpu
20 * if @cpu == ALL_CPUS, run @fn() on every online CPU.
22 * Description: This causes a thread to be scheduled on every cpu,
23 * each of which disables interrupts. The result is that noone is
24 * holding a spinlock or inside any other preempt-disabled region when
27 * This can be thought of as a very heavy write lock, equivalent to
28 * grabbing every spinlock in the kernel. */
29 int stop_machine_run(int (*fn)(void *), void *data, unsigned int cpu);
32 * __stop_machine_run: freeze the machine on all CPUs and run this function
33 * @fn: the function to run
34 * @data: the data ptr for the @fn
35 * @cpu: the cpu to run @fn on (or any, if @cpu == NR_CPUS.
37 * Description: This is a special version of the above, which assumes cpus
38 * won't come or go while it's being called. Used by hotplug cpu.
40 int __stop_machine_run(int (*fn)(void *), void *data, unsigned int cpu);
43 static inline int stop_machine_run(int (*fn)(void *), void *data,
52 #endif /* CONFIG_SMP */
53 #endif /* _LINUX_STOP_MACHINE */