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

@@ -1451,11 +1451,11 @@
         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);
+        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 {

@@ -1553,11 +1553,11 @@
         *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;
+                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);
         }