Since isync is not a memory barrier and lwsync doesn't guarantee StoreLoad
order, the only option we have is full memory barrier.
=== modified file 'storage/innobase/include/os0sync.h'
--- a/storage/innobase/include/os0sync.h 2014-09-08 15:10:48 +0000
+++ b/storage/innobase/include/os0sync.h 2014-11-18 08:07:42 +0000

#ifdef __powerpc__
-# define os_isync __asm __volatile ("isync":::"memory")
+# define os_isync __atomic_thread_fence(__ATOMIC_SEQ_CST)

you have to rename to the #define too (e.g to os_mb).

having a os_isync which is infact a mb is more obfuscation

than anyone should have to put up with.

/Jonas