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tile: Remove finish_arch_switch

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Move the simulator bits into switch_to() and use
finish_arch_post_lock_switch() for the homecache migration bits.

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
This commit is contained in:
Chris Metcalf 2015-07-30 12:32:46 -04:00
parent a0ddef81f4
commit 232ff5eb2b
2 changed files with 8 additions and 5 deletions
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8
arch/tile/include/asm/switch_to.h
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@ -53,15 +53,13 @@ extern unsigned long get_switch_to_pc(void);
* Kernel threads can check to see if they need to migrate their
* stack whenever they return from a context switch; for user
* threads, we defer until they are returning to user-space.
* We defer homecache migration until the runqueue lock is released.
*/
#define finish_arch_switch(prev) do { \
if (unlikely((prev)->state == TASK_DEAD)) \
__insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_OS_EXIT | \
((prev)->pid << _SIM_CONTROL_OPERATOR_BITS)); \
#define finish_arch_post_lock_switch() do { \
__insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_OS_SWITCH | \
(current->pid << _SIM_CONTROL_OPERATOR_BITS)); \
if (current->mm == NULL && !kstack_hash && \
current_thread_info()->homecache_cpu != smp_processor_id()) \
current_thread_info()->homecache_cpu != raw_smp_processor_id()) \
homecache_migrate_kthread(); \
} while (0)

5
arch/tile/kernel/process.c
View File

@ -446,6 +446,11 @@ struct task_struct *__sched _switch_to(struct task_struct *prev,
hardwall_switch_tasks(prev, next);
#endif
/* Notify the simulator of task exit. */
if (unlikely(prev->state == TASK_DEAD))
__insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_OS_EXIT |
(prev->pid << _SIM_CONTROL_OPERATOR_BITS));
/*
* Switch kernel SP, PC, and callee-saved registers.
* In the context of the new task, return the old task pointer