linux-kernel - [PATCH 1/8] jump_label: no need to acquire the jump_label_mutex in jump_lable

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Date:	Thu, 20 Aug 2015 20:14:29 +0800
From:	Kevin Hao <haokexin@...il.com>
To:	Michael Ellerman <mpe@...erman.id.au>
Cc:	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: [PATCH 1/8] jump_label: no need to acquire the jump_label_mutex in jump_lable_init()

The jump_label_init() run in a very early stage, even before the
sched_init(). So there is no chance for concurrent access of the
jump label table.

Signed-off-by: Kevin Hao <haokexin@...il.com>
---
 kernel/jump_label.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/kernel/jump_label.c b/kernel/jump_label.c
index f7dd15d537f9..df1a7fbe7cd5 100644
--- a/kernel/jump_label.c
+++ b/kernel/jump_label.c
@@ -205,7 +205,6 @@ void __init jump_label_init(void)
 	struct static_key *key = NULL;
 	struct jump_entry *iter;
 
-	jump_label_lock();
 	jump_label_sort_entries(iter_start, iter_stop);
 
 	for (iter = iter_start; iter < iter_stop; iter++) {
@@ -229,7 +228,6 @@ void __init jump_label_init(void)
 #endif
 	}
 	static_key_initialized = true;
-	jump_label_unlock();
 }
 
 #ifdef CONFIG_MODULES
-- 
2.1.0

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