SEQCNT_ZERO       126 include/linux/seqlock.h #define seqcount_init(x)	do { *(x) = (seqcount_t) SEQCNT_ZERO; } while (0)
SEQCNT_ZERO        28 mm/filemap_xip.c static seqcount_t xip_sparse_seq = SEQCNT_ZERO;