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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>
This commit is contained in:
Benjamin Herrenschmidt 2011-04-05 14:34:58 +10:00
parent 948cf67c47
commit dd79773864
1 changed files with 2 additions and 0 deletions
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arch/powerpc/kernel/head_64.S
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@ -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