MS_ASYNC           23 include/asm-generic/mman.h #define MS_ASYNC	1		/* sync memory asynchronously */
MS_ASYNC           27 include/asm-parisc/mman.h #define MS_ASYNC	2		/* sync memory asynchronously */
MS_ASYNC           60 include/asm-xtensa/mman.h #define MS_ASYNC	0x0001		/* sync memory asynchronously */