5045 use atomic_{inc,dec}_* instead of atomic_add_*

*** 1451,1461 ****
          int i;
          size_t nqcache;
          vmem_t *vmp, *cur, **vmpp;
          vmem_seg_t *vsp;
          vmem_freelist_t *vfp;
!         uint32_t id = atomic_add_32_nv(&vmem_id, 1);
  
          if (vmem_vmem_arena != NULL) {
                  vmp = vmem_alloc(vmem_vmem_arena, sizeof (vmem_t),
                      vmflag & VM_KMFLAGS);
          } else {
--- 1451,1461 ----
          int i;
          size_t nqcache;
          vmem_t *vmp, *cur, **vmpp;
          vmem_seg_t *vsp;
          vmem_freelist_t *vfp;
!         uint32_t id = atomic_inc_32_nv(&vmem_id);
  
          if (vmem_vmem_arena != NULL) {
                  vmp = vmem_alloc(vmem_vmem_arena, sizeof (vmem_t),
                      vmflag & VM_KMFLAGS);
          } else {
*** 1553,1563 ****
          *vmpp = vmp;
          mutex_exit(&vmem_list_lock);
  
          if (vmp->vm_cflags & VMC_POPULATOR) {
                  ASSERT(vmem_populators < VMEM_INITIAL);
!                 vmem_populator[atomic_add_32_nv(&vmem_populators, 1) - 1] = vmp;
                  mutex_enter(&vmp->vm_lock);
                  (void) vmem_populate(vmp, vmflag | VM_PANIC);
                  mutex_exit(&vmp->vm_lock);
          }
  
--- 1553,1563 ----
          *vmpp = vmp;
          mutex_exit(&vmem_list_lock);
  
          if (vmp->vm_cflags & VMC_POPULATOR) {
                  ASSERT(vmem_populators < VMEM_INITIAL);
!                 vmem_populator[atomic_inc_32_nv(&vmem_populators) - 1] = vmp;
                  mutex_enter(&vmp->vm_lock);
                  (void) vmem_populate(vmp, vmflag | VM_PANIC);
                  mutex_exit(&vmp->vm_lock);
          }