Linux Kernel  3.7.1
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barriers.h
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1 /*
2  * Barriers redefined for RealView ARM11MPCore platforms with L220 cache
3  * controller to work around hardware errata causing the outer_sync()
4  * operation to deadlock the system.
5  */
6 #define mb() dsb()
7 #define rmb() dsb()
8 #define wmb() mb()