powerpc: Perform an isync to synchronize CPUs coming out of secondary_hold
We need to do that to guarantee they see any code change done by
dynamic patching during boot.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 0700e11..6d17c37 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -147,6 +147,8 @@
mtctr r4
mr r3,r24
li r4,0
+ /* Make sure that patched code is visible */
+ isync
bctr
#else
BUG_OPCODE