mhprev            484 user/lib/libc/stdlib/malloc.c 	struct mheader *mh, *mhnext, *mhprev;
mhprev            531 user/lib/libc/stdlib/malloc.c 		mhprev = M_PREV(mh);
mhprev            532 user/lib/libc/stdlib/malloc.c 		__malloc_trymerge(mhprev, mh);