top               207 user/usertests.c   uint64 top = (uint64)sbrk(0);
top               208 user/usertests.c   if ((top % PGSIZE) != 0) {
top               209 user/usertests.c     sbrk(PGSIZE - (top % PGSIZE));
top               211 user/usertests.c   top = (uint64)sbrk(0);
top               212 user/usertests.c   if (top % PGSIZE) {
top               217 user/usertests.c   char *b = (char *)(top - 1);
top              2578 user/usertests.c   uint64 top = (uint64)sbrk(0);
top              2579 user/usertests.c   if ((top % PGSIZE) != 0)
top              2580 user/usertests.c     sbrk(PGSIZE - (top % PGSIZE));
top              2584 user/usertests.c   top = (uint64)sbrk(0);
top              2585 user/usertests.c   char *p = (char *)(top - 64);
top              2604 user/usertests.c   volatile char *top = sbrk(0);
top              2605 user/usertests.c   *(top - 1) = *(top - 1) + 1;