diff options
| -rw-r--r-- | arch/ia64/include/asm/processor.h | 1 | ||||
| -rw-r--r-- | arch/mips/include/asm/processor.h | 6 | ||||
| -rw-r--r-- | kernel/sched/core.c | 6 | ||||
| -rw-r--r-- | kernel/sched/sched.h | 30 |
4 files changed, 0 insertions, 43 deletions
diff --git a/arch/ia64/include/asm/processor.h b/arch/ia64/include/asm/processor.h index c7367130ab14..ce53c50d0ba4 100644 --- a/arch/ia64/include/asm/processor.h +++ b/arch/ia64/include/asm/processor.h @@ -19,7 +19,6 @@ #include <asm/ptrace.h> #include <asm/ustack.h> -#define __ARCH_WANT_UNLOCKED_CTXSW #define ARCH_HAS_PREFETCH_SWITCH_STACK #define IA64_NUM_PHYS_STACK_REG 96 diff --git a/arch/mips/include/asm/processor.h b/arch/mips/include/asm/processor.h index 05f08438a7c4..f1df4cb4a286 100644 --- a/arch/mips/include/asm/processor.h +++ b/arch/mips/include/asm/processor.h @@ -397,12 +397,6 @@ unsigned long get_wchan(struct task_struct *p); #define ARCH_HAS_PREFETCHW #define prefetchw(x) __builtin_prefetch((x), 1, 1) -/* - * See Documentation/scheduler/sched-arch.txt; prevents deadlock on SMP - * systems. - */ -#define __ARCH_WANT_UNLOCKED_CTXSW - #endif #endif /* _ASM_PROCESSOR_H */ diff --git a/kernel/sched/core.c b/kernel/sched/core.c index d65566d07fcf..5b0eac9f4e78 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2331,10 +2331,6 @@ asmlinkage __visible void schedule_tail(struct task_struct *prev) */ post_schedule(rq); -#ifdef __ARCH_WANT_UNLOCKED_CTXSW - /* In this case, finish_task_switch does not reenable preemption */ - preempt_enable(); -#endif if (current->set_child_tid) put_user(task_pid_vnr(current), current->set_child_tid); } @@ -2377,9 +2373,7 @@ context_switch(struct rq *rq, struct task_struct *prev, * of the scheduler it's an obvious special-case), so we * do an early lockdep release here: */ -#ifndef __ARCH_WANT_UNLOCKED_CTXSW spin_release(&rq->lock.dep_map, 1, _THIS_IP_); -#endif context_tracking_task_switch(prev, next); /* Here we just switch the register state and the stack. */ diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 16e1ca9cb7e8..6130251de280 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -975,7 +975,6 @@ static inline int task_on_rq_migrating(struct task_struct *p) # define finish_arch_post_lock_switch() do { } while (0) #endif -#ifndef __ARCH_WANT_UNLOCKED_CTXSW static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next) { #ifdef CONFIG_SMP @@ -1013,35 +1012,6 @@ static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev) raw_spin_unlock_irq(&rq->lock); } -#else /* __ARCH_WANT_UNLOCKED_CTXSW */ -static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next) -{ -#ifdef CONFIG_SMP - /* - * We can optimise this out completely for !SMP, because the - * SMP rebalancing from interrupt is the only thing that cares - * here. - */ - next->on_cpu = 1; -#endif - raw_spin_unlock(&rq->lock); -} - -static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev) -{ -#ifdef CONFIG_SMP - /* - * After ->on_cpu is cleared, the task can be moved to a different CPU. - * We must ensure this doesn't happen until the switch is completely - * finished. - */ - smp_wmb(); - prev->on_cpu = 0; -#endif - local_irq_enable(); -} -#endif /* __ARCH_WANT_UNLOCKED_CTXSW */ - /* * wake flags */ |
