From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keith Owens Date: Wed, 17 Aug 2005 05:39:13 +0000 Subject: [Review 1/7] MCA/INIT scheduler hooks Message-Id: <7788.1124257153@kao2.melbourne.sgi.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org Scheduler hooks to change which process is deemed to be on a cpu. include/linux/sched.h | 2 ++ kernel/sched.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 30 insertions(+) Index: linux/include/linux/sched.h =================================--- linux.orig/include/linux/sched.h 2005-08-01 11:49:17.130276812 +1000 +++ linux/include/linux/sched.h 2005-08-01 12:03:13.857267716 +1000 @@ -883,6 +883,8 @@ extern int task_curr(const task_t *p); extern int idle_cpu(int cpu); extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); extern task_t *idle_task(int cpu); +extern task_t *curr_task(int cpu); +extern void set_curr_task(int cpu, task_t *p); void yield(void); Index: linux/kernel/sched.c =================================--- linux.orig/kernel/sched.c 2005-08-01 11:49:19.642973411 +1000 +++ linux/kernel/sched.c 2005-08-01 12:03:13.860197405 +1000 @@ -3471,6 +3471,34 @@ 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_rq(cpu)->curr; +} +EXPORT_SYMBOL_GPL(curr_task); + +/** + * 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_rq(cpu)->curr = p; +} +EXPORT_SYMBOL_GPL(set_curr_task); + +/** * find_process_by_pid - find a process with a matching PID value. * @pid: the pid in question. */