kernel-ark/include/asm-ia64/mmu.h

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#ifndef __MMU_H
#define __MMU_H
/*
* Type for a context number. We declare it volatile to ensure proper
* ordering when it's accessed outside of spinlock'd critical sections
* (e.g., as done in activate_mm() and init_new_context()).
*/
typedef volatile unsigned long mm_context_t;
typedef unsigned long nv_mm_context_t;
#endif