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Subject[tip:perfcounters/core] perf_counter: use list_move_tail()
Commit-ID:  0bc8915410d0819ffb7e6c724df683896e208b46
Gitweb: http://git.kernel.org/tip/0bc8915410d0819ffb7e6c724df683896e208b46
Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
AuthorDate: Fri, 13 Mar 2009 12:21:29 +0100
Commit: Ingo Molnar <mingo@elte.hu>
CommitDate: Fri, 13 Mar 2009 13:59:08 +0100

perf_counter: use list_move_tail()

Instead of del/add use a move list-op.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20090313112301.288765724@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>


---
kernel/perf_counter.c | 6 ++----
1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index b2e8389..0fe22c9 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -89,8 +89,7 @@ list_del_counter(struct perf_counter *counter, struct perf_counter_context *ctx)
list_for_each_entry_safe(sibling, tmp,
&counter->sibling_list, list_entry) {

- list_del_init(&sibling->list_entry);
- list_add_tail(&sibling->list_entry, &ctx->counter_list);
+ list_move_tail(&sibling->list_entry, &ctx->counter_list);
sibling->group_leader = sibling;
}
}
@@ -959,8 +958,7 @@ static void rotate_ctx(struct perf_counter_context *ctx)
*/
perf_flags = hw_perf_save_disable();
list_for_each_entry(counter, &ctx->counter_list, list_entry) {
- list_del(&counter->list_entry);
- list_add_tail(&counter->list_entry, &ctx->counter_list);
+ list_move_tail(&counter->list_entry, &ctx->counter_list);
break;
}
hw_perf_restore(perf_flags);

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