jump_label: Make it possible for arches to invoke jump_label_init() earlier

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.

LGTM-by: Ingo (http://marc.info/?l=linux-kernel&m=144049104329961&w=2)
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>

1 files changed, 3 insertions, 0 deletions

diff --git a/kernel/jump_label.c b/kernel/jump_label.c
index 0dbea887d625..2d693be967df 100644
--- a/kernel/jump_label.c
+++ b/kernel/jump_label.c
@@ -235,6 +235,9 @@ 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);