siginfo.h:

  Define SI_DETHREAD.

include/asm-ia64/siginfo.h

@@ -136,6 +136,7 @@ typedef struct siginfo {
 #define SI_ASYNCIO	(-4)		/* sent by AIO completion */
 #define SI_SIGIO	(-5)		/* sent by queued SIGIO */
 #define SI_TKILL	(-6)		/* sent by tkill system call */
+#define SI_DETHREAD	(-7)		/* sent by execve() killing subsidiary threads */
 
 #define SI_FROMUSER(siptr)	((siptr)->si_code <= 0)
 #define SI_FROMKERNEL(siptr)	((siptr)->si_code > 0)