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authorChris Metcalf <cmetcalf@ezchip.com>2015-08-05 10:03:32 -0400
committerIngo Molnar <mingo@kernel.org>2015-08-08 10:29:21 +0200
commit1eaef888158dc441dcd00c20779251cfa5e756b3 (patch)
treeb531f2097ab1b6d263e86ffa49e89516b02e61ae
parentbef033a3c68a0cd31c81973946be768e9dd7ba42 (diff)
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tile: Reorganize _switch_to()
Move the simulator bits into finish_arch_post_lock_switch() and properly call __switch_to() from _switch_to(). Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com> Cc: <efault@gmx.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1438783412-10990-1-git-send-email-cmetcalf@ezchip.com [ Made it a delta to: fe363adb9225 ("sched, tile: Remove finish_arch_switch"). ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
-rw-r--r--arch/tile/include/asm/switch_to.h2
-rw-r--r--arch/tile/kernel/process.c16
2 files changed, 6 insertions, 12 deletions
diff --git a/arch/tile/include/asm/switch_to.h b/arch/tile/include/asm/switch_to.h
index 422842a56a3d..34ee72705521 100644
--- a/arch/tile/include/asm/switch_to.h
+++ b/arch/tile/include/asm/switch_to.h
@@ -56,6 +56,8 @@ extern unsigned long get_switch_to_pc(void);
* We defer homecache migration until the runqueue lock is released.
*/
#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 != raw_smp_processor_id()) \
homecache_migrate_kthread(); \
diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c
index 1087375cd57c..7d5769310bef 100644
--- a/arch/tile/kernel/process.c
+++ b/arch/tile/kernel/process.c
@@ -446,26 +446,18 @@ struct task_struct *__sched _switch_to(struct task_struct *prev,
hardwall_switch_tasks(prev, next);
#endif
- /*
- * 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. */
+ /* 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));
- __insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_OS_SWITCH |
- (next->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
* (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 prev;
+ return __switch_to(prev, next, next_current_ksp0(next));
}
/*