[SYSTEMTAP/PATCH 1/4] rt : replace __stp_tf_task_work_list_lock to raw_

[Santosh Shukla <sshukla@mvista.com>]

Fixes this bug_on for -rt case :

[ 2184.284672]  [<ffffffff81602329>] dump_stack+0x4e/0x7a
[ 2184.284679]  [<ffffffff815fcaed>] __schedule_bug+0x9f/0xad
[ 2184.284686]  [<ffffffff816057f7>] __schedule+0x627/0x6a0
[ 2184.284694]  [<ffffffff810be5fb>] ? task_blocks_on_rt_mutex+0x19b/0x220
[ 2184.284699]  [<ffffffff816058a0>] schedule+0x30/0xa0
[ 2184.284707]  [<ffffffff8160727d>] rt_spin_lock_slowlock+0xbd/0x1f0
[ 2184.284714]  [<ffffffff81607e25>] rt_spin_lock+0x25/0x30
[ 2184.284727]  [<ffffffffa08ae573>] __stp_tf_alloc_task_work+0x43/0x90 [stap_63e05c06fe2b0c2d17f8d8e096a4ee8a__1700]
[ 2184.284737]  [<ffffffffa08aff8b>] __stp_utrace_task_finder_target_syscall_exit+0xdb/0x350 [stap_63e05c06fe2b0c2d17f8d8e096a4ee8a__1700]
[ 2184.284747]  [<ffffffffa08a91d5>] utrace_report_syscall_exit+0xc5/0x110 [stap_63e05c06fe2b0c2d17f8d8e096a4ee8a__1700]
[ 2184.284753]  [<ffffffff81023ce0>] syscall_trace_leave+0x100/0x130
[ 2184.284758]  [<ffffffff8161090b>] int_check_syscall_exit_work+0x34/0x3d

Signed-off-by: Santosh Shukla <sshukla@mvista.com>
---
 runtime/linux/task_finder2.c |   14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/runtime/linux/task_finder2.c b/runtime/linux/task_finder2.c
index e88543a..afe8835 100644
--- a/runtime/linux/task_finder2.c
+++ b/runtime/linux/task_finder2.c
@@ -95,7 +95,7 @@ struct stap_task_finder_target {
 };
 
 static LIST_HEAD(__stp_tf_task_work_list);
-static DEFINE_SPINLOCK(__stp_tf_task_work_list_lock);
+static DEFINE_RAW_SPINLOCK(__stp_tf_task_work_list_lock);
 struct __stp_tf_task_work {
 	struct list_head list;
 	struct task_struct *task;
@@ -132,9 +132,9 @@ __stp_tf_alloc_task_work(void *data)
 	// list for easier lookup, but as short as the list should be
 	// (and as short lived as these items are) the extra overhead
 	// probably isn't worth the effort.
-	spin_lock_irqsave(&__stp_tf_task_work_list_lock, flags);
+	raw_spin_lock_irqsave(&__stp_tf_task_work_list_lock, flags);
 	list_add(&tf_work->list, &__stp_tf_task_work_list);
-	spin_unlock_irqrestore(&__stp_tf_task_work_list_lock, flags);
+	raw_spin_unlock_irqrestore(&__stp_tf_task_work_list_lock, flags);
 
 	return &tf_work->work;
 }
@@ -150,14 +150,14 @@ static void __stp_tf_free_task_work(struct task_work *work)
 	tf_work = container_of(work, struct __stp_tf_task_work, work);
 
 	// Remove the item from the list.
-	spin_lock_irqsave(&__stp_tf_task_work_list_lock, flags);
+	raw_spin_lock_irqsave(&__stp_tf_task_work_list_lock, flags);
 	list_for_each_entry(node, &__stp_tf_task_work_list, list) {
 		if (tf_work == node) {
 			list_del(&tf_work->list);
 			break;
 		}
 	}
-	spin_unlock_irqrestore(&__stp_tf_task_work_list_lock, flags);
+	raw_spin_unlock_irqrestore(&__stp_tf_task_work_list_lock, flags);
 
 	// Actually free the data.
 	_stp_kfree(tf_work);
@@ -173,14 +173,14 @@ static void __stp_tf_cancel_task_work(void)
 	unsigned long flags;
 
 	// Cancel all remaining requests.
-	spin_lock_irqsave(&__stp_tf_task_work_list_lock, flags);
+	raw_spin_lock_irqsave(&__stp_tf_task_work_list_lock, flags);
 	list_for_each_entry_safe(node, tmp, &__stp_tf_task_work_list, list) {
 	    // Remove the item from the list, cancel it, then free it.
 	    list_del(&node->list);
 	    stp_task_work_cancel(node->task, node->work.func);
 	    _stp_kfree(node);
 	}
-	spin_unlock_irqrestore(&__stp_tf_task_work_list_lock, flags);
+	raw_spin_unlock_irqrestore(&__stp_tf_task_work_list_lock, flags);
 }
 
 static u32
-- 
1.7.9.5