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authorLinus Torvalds <torvalds@g5.osdl.org>2005-09-12 10:59:21 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-12 10:59:21 -0400
commit1df5c10a5b40d1ad747e3de3caf28764153c5c8e (patch)
tree87cda6983653d73a3ba4d24b1c8ba257254ac26b /kernel
parentc3ff8ec31c1249d268cd11390649768a12bec1b9 (diff)
Mark ia64-specific MCA/INIT scheduler hooks as dangerous
..and only enable them for ia64. The functions are only valid when the whole system has been totally stopped and no scheduler activity is ongoing on any CPU, and interrupts are globally disabled. In other words, they aren't useful for anything else. So make sure that nobody can use them by mistake. Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched.c70
1 files changed, 44 insertions, 26 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index e9ff04a9b56d..81b3a96ed2d0 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3577,32 +3577,6 @@ task_t *idle_task(int cpu)
3577} 3577}
3578 3578
3579/** 3579/**
3580 * curr_task - return the current task for a given cpu.
3581 * @cpu: the processor in question.
3582 */
3583task_t *curr_task(int cpu)
3584{
3585 return cpu_curr(cpu);
3586}
3587
3588/**
3589 * set_curr_task - set the current task for a given cpu.
3590 * @cpu: the processor in question.
3591 * @p: the task pointer to set.
3592 *
3593 * Description: This function must only be used when non-maskable interrupts
3594 * are serviced on a separate stack. It allows the architecture to switch the
3595 * notion of the current task on a cpu in a non-blocking manner. This function
3596 * must be called with interrupts disabled, the caller must save the original
3597 * value of the current task (see curr_task() above) and restore that value
3598 * before reenabling interrupts.
3599 */
3600void set_curr_task(int cpu, task_t *p)
3601{
3602 cpu_curr(cpu) = p;
3603}
3604
3605/**
3606 * find_process_by_pid - find a process with a matching PID value. 3580 * find_process_by_pid - find a process with a matching PID value.
3607 * @pid: the pid in question. 3581 * @pid: the pid in question.
3608 */ 3582 */
@@ -5628,3 +5602,47 @@ void normalize_rt_tasks(void)
5628} 5602}
5629 5603
5630#endif /* CONFIG_MAGIC_SYSRQ */ 5604#endif /* CONFIG_MAGIC_SYSRQ */
5605
5606#ifdef CONFIG_IA64
5607/*
5608 * These functions are only useful for the IA64 MCA handling.
5609 *
5610 * They can only be called when the whole system has been
5611 * stopped - every CPU needs to be quiescent, and no scheduling
5612 * activity can take place. Using them for anything else would
5613 * be a serious bug, and as a result, they aren't even visible
5614 * under any other configuration.
5615 */
5616
5617/**
5618 * curr_task - return the current task for a given cpu.
5619 * @cpu: the processor in question.
5620 *
5621 * ONLY VALID WHEN THE WHOLE SYSTEM IS STOPPED!
5622 */
5623task_t *curr_task(int cpu)
5624{
5625 return cpu_curr(cpu);
5626}
5627
5628/**
5629 * set_curr_task - set the current task for a given cpu.
5630 * @cpu: the processor in question.
5631 * @p: the task pointer to set.
5632 *
5633 * Description: This function must only be used when non-maskable interrupts
5634 * are serviced on a separate stack. It allows the architecture to switch the
5635 * notion of the current task on a cpu in a non-blocking manner. This function
5636 * must be called with all CPU's synchronized, and interrupts disabled, the
5637 * and caller must save the original value of the current task (see
5638 * curr_task() above) and restore that value before reenabling interrupts and
5639 * re-starting the system.
5640 *
5641 * ONLY VALID WHEN THE WHOLE SYSTEM IS STOPPED!
5642 */
5643void set_curr_task(int cpu, task_t *p)
5644{
5645 cpu_curr(cpu) = p;
5646}
5647
5648#endif