Almost implemented.

kernel/include/syscall.h

@@ -250,6 +250,7 @@ struct procfs_read {
 	int count;		/* bytes to read (request) */
 	int eof;		/* if eof is detected, 1 otherwise 0. (answer)*/
 	int ret;		/* read bytes (answer) */
+	int newcpu;		/* migrated new cpu (answer) */
 	char fname[PROCFS_NAME_MAX];	/* procfs filename (request) */
 };