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Commit fe363adb authored by Chris Metcalf's avatar Chris Metcalf Committed by Ingo Molnar
Browse files

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: default avatarChris Metcalf <cmetcalf@ezchip.com>
Signed-off-by: default avatarPeter 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: default avatarIngo Molnar <mingo@kernel.org>
parent b31fdac2

arch/tile/include/asm/switch_to.h

+3 −7
Original line number Diff line number Diff line
@@ -53,15 +53,11 @@ 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));     \

	__insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_OS_SWITCH |             \

		(current->pid << _SIM_CONTROL_OPERATOR_BITS));            \

#define finish_arch_post_lock_switch() do {                               \

	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)

arch/tile/kernel/process.c

+15 −2
Original line number Diff line number Diff line
@@ -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;

}



/*