linux-kernel - [PATCH 2/8] jump_label: make it possible for the archs to invoke jump_label

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Date:	Thu, 20 Aug 2015 20:14:30 +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 2/8] jump_label: make it possible for the archs to invoke jump_label_init() much earlier

For some archs (such as powerpc) would want to invoke jump_label_init()
in a much earlier stage. So check static_key_initialized in order to
make sure this function run only once.

Signed-off-by: Kevin Hao <haokexin@...il.com>
---
 kernel/jump_label.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/jump_label.c b/kernel/jump_label.c
index df1a7fbe7cd5..fcae370f8794 100644
--- a/kernel/jump_label.c
+++ b/kernel/jump_label.c
@@ -205,6 +205,9 @@ void __init jump_label_init(void)
 	struct static_key *key = NULL;
 	struct jump_entry *iter;
 
+	if (static_key_initialized)
+		return;
+
 	jump_label_sort_entries(iter_start, iter_stop);
 
 	for (iter = iter_start; iter < iter_stop; iter++) {
-- 
2.1.0

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