Job with core-spec allocated all avail cores

Job allocaitons with core specialization are allocated all available
CPUs on the selected nodes rather than only the number required to
satisfy their allocation request (e.g. "srun --core-spec=1 -n1 date"
will not be allocated 1 CPU, but will get the entire node except
for one specialized core).

src/plugins/select/cons_res/dist_tasks.c

@@ -899,12 +899,17 @@ extern int cr_dist(struct job_record *job_ptr, const uint16_t cr_type)
 {
 	int error_code, cr_cpu = 1;
 
-	if (((job_ptr->job_resrcs->node_req == NODE_CR_RESERVED) ||
-	     (job_ptr->details->whole_node != 0)) &&
-	    (job_ptr->details->core_spec == 0)) {
-		/* the job has been allocated an EXCLUSIVE set of nodes,
+	if (job_ptr->details->core_spec != 0) {
+		/* The job has been allocated all non-specialized cores,
+		 * so we don't need to select specific CPUs. */
+		return SLURM_SUCCESS;
+	}
+
+	if ((job_ptr->job_resrcs->node_req == NODE_CR_RESERVED) ||
+	    (job_ptr->details->whole_node != 0)) {
+		/* The job has been allocated an EXCLUSIVE set of nodes,
 		 * so it gets all of the bits in the core_bitmap and
-		 * all of the available CPUs in the cpus array */
+		 * all of the available CPUs in the cpus array. */
 		int size = bit_size(job_ptr->job_resrcs->core_bitmap);
 		bit_nset(job_ptr->job_resrcs->core_bitmap, 0, size-1);
 		return SLURM_SUCCESS;