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Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus

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* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus:
  stop_machine: fix up ftrace.c
  stop_machine: Wean existing callers off stop_machine_run()
  stop_machine(): stop_machine_run() changed to use cpu mask
  Hotplug CPU: don't check cpu_online after take_cpu_down
  Simplify stop_machine
  stop_machine: add ALL_CPUS option
  module: fix build warning with !CONFIG_KALLSYMS
This commit is contained in:
Linus Torvalds 2008-07-28 08:37:46 -07:00
commit 37eaf8c746
9 changed files with 211 additions and 226 deletions
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50
include/linux/stop_machine.h
View file

@ -5,41 +5,43 @@
(and more). So the "read" side to such a lock is anything which
diables preeempt. */
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <asm/system.h>
#if defined(CONFIG_STOP_MACHINE) && defined(CONFIG_SMP)
/* Deprecated, but useful for transition. */
#define ALL_CPUS ~0U
/**
* stop_machine_run: freeze the machine on all CPUs and run this function
* stop_machine: 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.
* @cpus: the cpus to run the @fn() on (NULL = any online cpu)
*
* 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.
* Description: This causes a thread to be scheduled on every cpu,
* each of which disables interrupts. 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);
int stop_machine(int (*fn)(void *), void *data, const cpumask_t *cpus);
/**
* __stop_machine_run: freeze the machine on all CPUs and run this function
* __stop_machine: 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.
* @cpus: the cpus to run the @fn() on (NULL = any online cpu)
*
* 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.
* 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.
*/
struct task_struct *__stop_machine_run(int (*fn)(void *), void *data,
unsigned int cpu);
int __stop_machine(int (*fn)(void *), void *data, const cpumask_t *cpus);
#else
static inline int stop_machine_run(int (*fn)(void *), void *data,
unsigned int cpu)
static inline int stop_machine(int (*fn)(void *), void *data,
const cpumask_t *cpus)
{
int ret;
local_irq_disable();
@ -48,4 +50,18 @@ static inline int stop_machine_run(int (*fn)(void *), void *data,
return ret;
}
#endif /* CONFIG_SMP */
static inline int __deprecated stop_machine_run(int (*fn)(void *), void *data,
unsigned int cpu)
{
/* If they don't care which cpu fn runs on, just pick one. */
if (cpu == NR_CPUS)
return stop_machine(fn, data, NULL);
else if (cpu == ~0U)
return stop_machine(fn, data, &cpu_possible_map);
else {
cpumask_t cpus = cpumask_of_cpu(cpu);
return stop_machine(fn, data, &cpus);
}
}
#endif /* _LINUX_STOP_MACHINE */