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6153 use NULL pagelock segop as a shorthand for ENOTSUP

*** 1972,1981 **** --- 1972,1984 ---- int segop_pagelock(struct seg *seg, caddr_t addr, size_t len, struct page ***page, enum lock_type type, enum seg_rw rw) { + if (seg->s_ops->pagelock == NULL) + return (ENOTSUP); + return (seg->s_ops->pagelock(seg, addr, len, page, type, rw)); } int segop_setpagesize(struct seg *seg, caddr_t addr, size_t len, uint_t szc)