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authorDmitry Adamushko <dmitry.adamushko@gmail.com>2007-12-18 09:21:13 -0500
committerIngo Molnar <mingo@elte.hu>2007-12-18 09:21:13 -0500
commit051a1d1afa47206e23ae03f781c6795ce870e3d5 (patch)
tree6ce53c173a3a7582896504ecfc758e993455e5fb /kernel/sched.c
parentc63a1190368771b8207d86c4217ae4afdf1cbd5e (diff)
sched: fix crash on ia64, introduce task_current()
Some services (e.g. sched_setscheduler(), rt_mutex_setprio() and sched_move_task()) must handle a given task differently in case it's the 'rq->curr' task on its run-queue. The task_running() interface is not suitable for determining such tasks for platforms with one of the following options: #define __ARCH_WANT_UNLOCKED_CTXSW #define __ARCH_WANT_INTERRUPTS_ON_CTXSW Due to the fact that it makes use of 'p->oncpu == 1' as a criterion but such a task is not necessarily 'rq->curr'. The detailed explanation is available here: https://lists.linux-foundation.org/pipermail/containers/2007-December/009262.html Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Tested-by: Dhaval Giani <dhaval@linux.vnet.ibm.com> Tested-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Diffstat (limited to 'kernel/sched.c')
-rw-r--r--kernel/sched.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index c6e551de795b..5ae0d4296e7c 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -508,10 +508,15 @@ EXPORT_SYMBOL_GPL(cpu_clock);
508# define finish_arch_switch(prev) do { } while (0) 508# define finish_arch_switch(prev) do { } while (0)
509#endif 509#endif
510 510
511static inline int task_current(struct rq *rq, struct task_struct *p)
512{
513 return rq->curr == p;
514}
515
511#ifndef __ARCH_WANT_UNLOCKED_CTXSW 516#ifndef __ARCH_WANT_UNLOCKED_CTXSW
512static inline int task_running(struct rq *rq, struct task_struct *p) 517static inline int task_running(struct rq *rq, struct task_struct *p)
513{ 518{
514 return rq->curr == p; 519 return task_current(rq, p);
515} 520}
516 521
517static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next) 522static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next)
@@ -540,7 +545,7 @@ static inline int task_running(struct rq *rq, struct task_struct *p)
540#ifdef CONFIG_SMP 545#ifdef CONFIG_SMP
541 return p->oncpu; 546 return p->oncpu;
542#else 547#else
543 return rq->curr == p; 548 return task_current(rq, p);
544#endif 549#endif
545} 550}
546 551
@@ -3334,7 +3339,7 @@ unsigned long long task_sched_runtime(struct task_struct *p)
3334 3339
3335 rq = task_rq_lock(p, &flags); 3340 rq = task_rq_lock(p, &flags);
3336 ns = p->se.sum_exec_runtime; 3341 ns = p->se.sum_exec_runtime;
3337 if (rq->curr == p) { 3342 if (task_current(rq, p)) {
3338 update_rq_clock(rq); 3343 update_rq_clock(rq);
3339 delta_exec = rq->clock - p->se.exec_start; 3344 delta_exec = rq->clock - p->se.exec_start;
3340 if ((s64)delta_exec > 0) 3345 if ((s64)delta_exec > 0)
@@ -4021,7 +4026,7 @@ void rt_mutex_setprio(struct task_struct *p, int prio)
4021 4026
4022 oldprio = p->prio; 4027 oldprio = p->prio;
4023 on_rq = p->se.on_rq; 4028 on_rq = p->se.on_rq;
4024 running = task_running(rq, p); 4029 running = task_current(rq, p);
4025 if (on_rq) { 4030 if (on_rq) {
4026 dequeue_task(rq, p, 0); 4031 dequeue_task(rq, p, 0);
4027 if (running) 4032 if (running)
@@ -4332,7 +4337,7 @@ recheck:
4332 } 4337 }
4333 update_rq_clock(rq); 4338 update_rq_clock(rq);
4334 on_rq = p->se.on_rq; 4339 on_rq = p->se.on_rq;
4335 running = task_running(rq, p); 4340 running = task_current(rq, p);
4336 if (on_rq) { 4341 if (on_rq) {
4337 deactivate_task(rq, p, 0); 4342 deactivate_task(rq, p, 0);
4338 if (running) 4343 if (running)
@@ -7101,7 +7106,7 @@ void sched_move_task(struct task_struct *tsk)
7101 7106
7102 update_rq_clock(rq); 7107 update_rq_clock(rq);
7103 7108
7104 running = task_running(rq, tsk); 7109 running = task_current(rq, tsk);
7105 on_rq = tsk->se.on_rq; 7110 on_rq = tsk->se.on_rq;
7106 7111
7107 if (on_rq) { 7112 if (on_rq) {