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[v3,13/21] jump_label: Make it possible for arches to invoke jump_label_init() earlier

Message ID 1469629097-30859-13-git-send-email-mpe@ellerman.id.au (mailing list archive)
State Accepted
Headers show

Commit Message

Michael Ellerman July 27, 2016, 2:18 p.m. UTC 
From: Kevin Hao <haokexin@gmail.com>

Some arches (powerpc at least) would like to invoke jump_label_init()
much earlier in boot. So check static_key_initialized in order to make
sure this function runs only once.

Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
 kernel/jump_label.c | 3 +++
 1 file changed, 3 insertions(+)

v3: Updated change log.
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Patch

diff --git a/kernel/jump_label.c b/kernel/jump_label.c
index 05254eeb4b4e..14d81315fd7e 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_lock();
 	jump_label_sort_entries(iter_start, iter_stop);