diff options
| -rw-r--r-- | kernel/sched.c | 70 |
1 files changed, 44 insertions, 26 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index e9ff04a..81b3a96 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -3577,32 +3577,6 @@ task_t *idle_task(int cpu) } /** - * curr_task - return the current task for a given cpu. - * @cpu: the processor in question. - */ -task_t *curr_task(int cpu) -{ - return cpu_curr(cpu); -} - -/** - * set_curr_task - set the current task for a given cpu. - * @cpu: the processor in question. - * @p: the task pointer to set. - * - * Description: This function must only be used when non-maskable interrupts - * are serviced on a separate stack. It allows the architecture to switch the - * notion of the current task on a cpu in a non-blocking manner. This function - * must be called with interrupts disabled, the caller must save the original - * value of the current task (see curr_task() above) and restore that value - * before reenabling interrupts. - */ -void set_curr_task(int cpu, task_t *p) -{ - cpu_curr(cpu) = p; -} - -/** * find_process_by_pid - find a process with a matching PID value. * @pid: the pid in question. */ @@ -5628,3 +5602,47 @@ void normalize_rt_tasks(void) } #endif /* CONFIG_MAGIC_SYSRQ */ + +#ifdef CONFIG_IA64 +/* + * These functions are only useful for the IA64 MCA handling. + * + * They can only be called when the whole system has been + * stopped - every CPU needs to be quiescent, and no scheduling + * activity can take place. Using them for anything else would + * be a serious bug, and as a result, they aren't even visible + * under any other configuration. + */ + +/** + * curr_task - return the current task for a given cpu. + * @cpu: the processor in question. + * + * ONLY VALID WHEN THE WHOLE SYSTEM IS STOPPED! + */ +task_t *curr_task(int cpu) +{ + return cpu_curr(cpu); +} + +/** + * set_curr_task - set the current task for a given cpu. + * @cpu: the processor in question. + * @p: the task pointer to set. + * + * Description: This function must only be used when non-maskable interrupts + * are serviced on a separate stack. It allows the architecture to switch the + * notion of the current task on a cpu in a non-blocking manner. This function + * must be called with all CPU's synchronized, and interrupts disabled, the + * and caller must save the original value of the current task (see + * curr_task() above) and restore that value before reenabling interrupts and + * re-starting the system. + * + * ONLY VALID WHEN THE WHOLE SYSTEM IS STOPPED! + */ +void set_curr_task(int cpu, task_t *p) +{ + cpu_curr(cpu) = p; +} + +#endif |
