How to reduce M20K usage ?

channel channel_vec    coef_ch  __attribute__((depth(0)));
typdef struct{
   float  data
} vector_line; 
typdef struct{
   vector_line lane
} channel_vec;
 __kernel 
void ReadBlock( 
 			uchar dim1, 
 			uchar dim2, 
 			// Data
 			__global channel_vec  *restrict coef) 
 { 
	 
 	int loc_x = get_local_id(0); 
 	int loc_y = get_local_id(1); 
 	int loc_z = get_local_id(2); 
 	int block_x = get_group_id(0); 
 	int block_y = get_group_id(1); 
 	int block_z = get_group_id(2); 
 	channel_vec coeft_ch_vec; 
 
	coef_ch_vec = coef; 
	  
	write_channel_altera(coef_ch, coef_ch_vec);		 
}