sched, tile: Remove finish_arch_switch

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

Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 15 insertions, 2 deletions

diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c
index a452137..1087375 100644
--- a/arch/tile/kernel/process.c
+++ b/arch/tile/kernel/process.c
@@ -448,11 +448,24 @@ struct task_struct *__sched _switch_to(struct task_struct *prev,
 
 	/*
 	 * Switch kernel SP, PC, and callee-saved registers.
+	 * Pass the value to use for SYSTEM_SAVE_K_0 when we reset our sp.
+	 * Once we return from this function we will have changed stacks
+	 * and be running with current == next.
+	 */
+	__switch_to(prev, next, next_current_ksp0(next));
+
+	/* Notify the simulator of task switch and task exit. */
+	if (unlikely(prev->state == TASK_DEAD))
+		__insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_OS_EXIT |
+			     (prev->pid << _SIM_CONTROL_OPERATOR_BITS));
+	__insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_OS_SWITCH |
+		(next->pid << _SIM_CONTROL_OPERATOR_BITS));
+
+	/*
 	 * In the context of the new task, return the old task pointer
 	 * (i.e. the task that actually called __switch_to).
-	 * Pass the value to use for SYSTEM_SAVE_K_0 when we reset our sp.
 	 */
-	return __switch_to(prev, next, next_current_ksp0(next));
+	return prev;
 }
 
 /*