um: don't bother blocking SIGARLM and SIGUSR1

We used to generate those, but we hadn't done that for a long
time.  No need to bother blocking them for signal handlers.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>

arch/um/os-Linux/process.c

@@ -236,20 +236,19 @@ out:
 void init_new_thread_signals(void)
 {
 	set_handler(SIGSEGV, (__sighandler_t) sig_handler, SA_ONSTACK,
-		    SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
+		    SIGIO, SIGWINCH, SIGVTALRM, -1);
 	set_handler(SIGTRAP, (__sighandler_t) sig_handler, SA_ONSTACK,
-		    SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
+		    SIGIO, SIGWINCH, SIGVTALRM, -1);
 	set_handler(SIGFPE, (__sighandler_t) sig_handler, SA_ONSTACK,
-		    SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
+		    SIGIO, SIGWINCH, SIGVTALRM, -1);
 	set_handler(SIGILL, (__sighandler_t) sig_handler, SA_ONSTACK,
-		    SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
+		    SIGIO, SIGWINCH, SIGVTALRM, -1);
 	set_handler(SIGBUS, (__sighandler_t) sig_handler, SA_ONSTACK,
-		    SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
+		    SIGIO, SIGWINCH, SIGVTALRM, -1);
 	signal(SIGHUP, SIG_IGN);
 
 	set_handler(SIGIO, (__sighandler_t) sig_handler,
-		    SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, SIGALRM,
-		    SIGVTALRM, -1);
+		    SA_ONSTACK | SA_RESTART, SIGIO, SIGWINCH, SIGVTALRM, -1);
 	signal(SIGWINCH, SIG_IGN);
 	signal(SIGTERM, SIG_DFL);
 }

arch/um/os-Linux/signal.c

@@ -112,7 +112,7 @@ void alarm_handler(int sig, struct sigcontext *sc)
 void timer_init(void)
 {
 	set_handler(SIGVTALRM, (__sighandler_t) alarm_handler,
-		    SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, -1);
+		    SA_ONSTACK | SA_RESTART, SIGIO, SIGWINCH, -1);
 }
 
 void set_sigstack(void *sig_stack, int size)

arch/um/os-Linux/skas/process.c

@@ -660,7 +660,7 @@ int start_idle_thread(void *stack, jmp_buf *switch_buf)
 	int n;
 
 	set_handler(SIGWINCH, (__sighandler_t) sig_handler,
-		    SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGVTALRM, -1);
+		    SA_ONSTACK | SA_RESTART, SIGIO, SIGVTALRM, -1);
 
 	/*
 	 * Can't use UML_SETJMP or UML_LONGJMP here because they save