linux-kernel - [tip:perfcounters/core] perf_counter: use list_move

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Message-ID: <tip-5026af9f8cc04ced259b492a1fa2754c11ddda1a@git.kernel.org>
Date:	Fri, 13 Mar 2009 13:06:34 GMT
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perfcounters/core] perf_counter: use list_move_tail()

Commit-ID:  5026af9f8cc04ced259b492a1fa2754c11ddda1a
Gitweb:     http://git.kernel.org/tip/5026af9f8cc04ced259b492a1fa2754c11ddda1a
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Fri, 13 Mar 2009 12:21:29 +0100
Commit:     Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 13 Mar 2009 14:02:43 +0100

perf_counter: use list_move_tail()

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

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