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source code
_SHM_IDX_BITS
63
include/linux/shm.h
#define SHM_IDX_MASK ((1<<_SHM_IDX_BITS)-1)
_SHM_IDX_BITS
71
include/linux/shm.h
#define SHMALL (1<<(_SHM_IDX_BITS+_SHM_ID_BITS))/* max shm system wide (pages) */