WordPress: List popular posts by comment count

functions.php

<?php
/*
*  List popular posts by comment count
*  This function used for Genesis custom theme, May be work with any theme.
*/
function m3_popular_posts(){
	$args = array( 
		'no_found_rows' => 1, 
		'post_status' => 'publish',		
		'orderby' => 'comment_count',		
		'posts_per_page' => 5 
	);
	$popular_posts = new WP_Query( $args );
	/*
echo "Last wp_popular_posts-Query: {$popular_posts->request}";
*/
	while ( $popular_posts->have_posts() ) : $popular_posts->the_post();
		echo '<div class="post m3-posts">';
		if  ( has_post_thumbnail() ){
			printf('<a href="%s" title="%s" rel="bookmark" class="post-thumbnail alignleft">%s</a>', get_permalink(), the_title_attribute( 'echo=0' ), get_the_title() );
		}
		printf('<h2><a href="%s">%s</a></h2><p class="byline post-info"><span class="date published time">%s</span></p>', get_permalink(), get_the_title(), get_the_time(get_option('date_format')));
		echo '</div><!--end m3-posts -->';
	endwhile; 
	wp_reset_query();
}