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authorChris Metcalf <cmetcalf@ezchip.com>2015-07-30 19:32:46 +0300
committerChris Metcalf <cmetcalf@ezchip.com>2015-08-03 19:14:48 +0300
commit232ff5eb2bf304fc699b132134437a7cb9b2ec16 (patch)
treeed92e241ee1a96418ccf4a91200bd63ebb4d5567
parenta0ddef81f4aeeeec3326f6b6a255d8ea13b41908 (diff)
downloadlinux-232ff5eb2bf304fc699b132134437a7cb9b2ec16.tar.xz
tile: Remove finish_arch_switch
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>
-rw-r--r--arch/tile/include/asm/switch_to.h8
-rw-r--r--arch/tile/kernel/process.c5
2 files changed, 8 insertions, 5 deletions
diff --git a/arch/tile/include/asm/switch_to.h b/arch/tile/include/asm/switch_to.h
index b8f888cbe6b0..34ee72705521 100644
--- a/arch/tile/include/asm/switch_to.h
+++ b/arch/tile/include/asm/switch_to.h
@@ -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)
diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c
index a45213781ad0..7d5769310bef 100644
--- a/arch/tile/kernel/process.c
+++ b/arch/tile/kernel/process.c
@@ -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