mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 02:09:42 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
52 lines
1.8 KiB
C
52 lines
1.8 KiB
C
#ifndef _LINUX_STOP_MACHINE
|
|
#define _LINUX_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
|
|
diables preeempt. */
|
|
#include <linux/config.h>
|
|
#include <linux/cpu.h>
|
|
#include <asm/system.h>
|
|
|
|
#if defined(CONFIG_STOP_MACHINE) && defined(CONFIG_SMP)
|
|
/**
|
|
* stop_machine_run: freeze the machine on all CPUs and run this function
|
|
* @fn: the function to run
|
|
* @data: the data ptr for the @fn()
|
|
* @cpu: the cpu to run @fn() on (or any, if @cpu == NR_CPUS.
|
|
*
|
|
* Description: This causes a thread to be scheduled on every other cpu,
|
|
* each of which disables interrupts, and finally interrupts are disabled
|
|
* on the current CPU. The result is that noone 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_run(int (*fn)(void *), void *data, unsigned int cpu);
|
|
|
|
/**
|
|
* __stop_machine_run: freeze the machine on all CPUs and run this function
|
|
* @fn: the function to run
|
|
* @data: the data ptr for the @fn
|
|
* @cpu: the cpu to run @fn on (or any, if @cpu == NR_CPUS.
|
|
*
|
|
* Description: This is a special version of the above, which returns the
|
|
* thread which has run @fn(): kthread_stop will return the return value
|
|
* of @fn(). Used by hotplug cpu.
|
|
*/
|
|
struct task_struct *__stop_machine_run(int (*fn)(void *), void *data,
|
|
unsigned int cpu);
|
|
|
|
#else
|
|
|
|
static inline int stop_machine_run(int (*fn)(void *), void *data,
|
|
unsigned int cpu)
|
|
{
|
|
int ret;
|
|
local_irq_disable();
|
|
ret = fn(data);
|
|
local_irq_enable();
|
|
return ret;
|
|
}
|
|
#endif /* CONFIG_SMP */
|
|
#endif /* _LINUX_STOP_MACHINE */
|