[PATCH 14/15] powerpc: Perform an isync to synchronize CPUs coming out of secondary_hold

[Benjamin Herrenschmidt]

We need to do that to guarantee they see any code change done by
dynamic patching during boot.

Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
---
 arch/powerpc/kernel/head_64.S |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 370afd4..2505f78 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -147,6 +147,8 @@ __secondary_hold:
 	mtctr	r4
 	mr	r3,r24
 	li	r4,0
+	/* Make sure that patched code is visible */
+	isync
 	bctr
 #else
 	BUG_OPCODE
-- 
1.7.1