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Subject[PATCH 1/3] tracing/stat: change dummpy_cmp() to return -1
Date
From: Li Zefan <lizf@cn.fujitsu.com>

Currently the output of trace_stat/workqueues is totally reversed:

# cat /debug/tracing/trace_stat/workqueues
...
1 17 17 210 37 `-blk_unplug_work+0x0/0x57
1 3779 3779 181 11 |-cfq_kick_queue+0x0/0x2f
1 3796 3796 kblockd/1:120
...
The correct output should be:

1 3796 3796 kblockd/1:120
1 3779 3779 181 11 |-cfq_kick_queue+0x0/0x2f
1 17 17 210 37 `-blk_unplug_work+0x0/0x57
It's caused by "tracing/stat: replace linked list by an rbtree for
sorting"
(53059c9b67a62a3dc8c80204d3da42b9267ea5a0).

dummpy_cmp() should return -1, so rb_node will always be inserted as
right-most node in the rbtree, thus we sort the output in ascending
order.

[ Impact: fix the output of trace_stat/workqueues ]

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
---
kernel/trace/trace_stat.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c
index 2e849b5..8b7420a 100644
--- a/kernel/trace/trace_stat.c
+++ b/kernel/trace/trace_stat.c
@@ -127,7 +127,7 @@ insert_stat(struct rb_root *root, struct stat_node *data, cmp_stat_t cmp)
*/
static int dummy_cmp(void *p1, void *p2)
{
- return 1;
+ return -1;
}

/*
--
1.6.2.3


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