[PATCH] uml: signal initialization cleanup

It turns out that init_new_thread_signals is always called with altstack == 1,
so we can eliminate the parameter.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/include/os.h

@@ -199,7 +199,7 @@ extern int os_getpid(void);
 extern int os_getpgrp(void);
 
 extern void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int));
-extern void init_new_thread_signals(int altstack);
+extern void init_new_thread_signals(void);
 extern int run_kernel_thread(int (*fn)(void *), void *arg, void **jmp_ptr);
 
 extern int os_map_memory(void *virt, int fd, unsigned long long off,

arch/um/kernel/skas/process_kern.c

@@ -177,7 +177,7 @@ int start_uml_skas(void)
 	if(proc_mm)
 		userspace_pid[0] = start_userspace(0);
 
-	init_new_thread_signals(1);
+	init_new_thread_signals();
 
 	init_task.thread.request.u.thread.proc = start_kernel_proc;
 	init_task.thread.request.u.thread.arg = NULL;

arch/um/kernel/tt/exec_kern.c

@@ -21,7 +21,7 @@
 static int exec_tramp(void *sig_stack)
 {
 	init_new_thread_stack(sig_stack, NULL);
-	init_new_thread_signals(1);
+	init_new_thread_signals();
 	os_stop_process(os_getpid());
 	return(0);
 }

arch/um/kernel/tt/process_kern.c

@@ -142,7 +142,7 @@ static void new_thread_handler(int sig)
 		schedule_tail(current->thread.prev_sched);
 	current->thread.prev_sched = NULL;
 
-	init_new_thread_signals(1);
+	init_new_thread_signals();
 	enable_timer();
 	free_page(current->thread.temp_stack);
 	set_cmdline("(kernel thread)");

arch/um/os-Linux/process.c

@@ -250,25 +250,24 @@ void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int))
 	if(usr1_handler) set_handler(SIGUSR1, usr1_handler, flags, -1);
 }
 
-void init_new_thread_signals(int altstack)
+void init_new_thread_signals(void)
 {
-	int flags = altstack ? SA_ONSTACK : 0;
-
-	set_handler(SIGSEGV, (__sighandler_t) sig_handler, flags,
+	set_handler(SIGSEGV, (__sighandler_t) sig_handler, SA_ONSTACK,
 		    SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
-	set_handler(SIGTRAP, (__sighandler_t) sig_handler, flags,
+	set_handler(SIGTRAP, (__sighandler_t) sig_handler, SA_ONSTACK,
 		    SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
-	set_handler(SIGFPE, (__sighandler_t) sig_handler, flags,
+	set_handler(SIGFPE, (__sighandler_t) sig_handler, SA_ONSTACK,
 		    SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
-	set_handler(SIGILL, (__sighandler_t) sig_handler, flags,
+	set_handler(SIGILL, (__sighandler_t) sig_handler, SA_ONSTACK,
 		    SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
-	set_handler(SIGBUS, (__sighandler_t) sig_handler, flags,
+	set_handler(SIGBUS, (__sighandler_t) sig_handler, SA_ONSTACK,
 		    SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
 	set_handler(SIGUSR2, (__sighandler_t) sig_handler,
-		    flags, SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+		    SA_ONSTACK, SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM,
+		    -1);
 	signal(SIGHUP, SIG_IGN);
 
-	init_irq_signals(altstack);
+	init_irq_signals(1);
 }
 
 int run_kernel_thread(int (*fn)(void *), void *arg, void **jmp_ptr)

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

@@ -159,7 +159,7 @@ static int userspace_tramp(void *stack)
 
 	ptrace(PTRACE_TRACEME, 0, 0, 0);
 
-	init_new_thread_signals(1);
+	init_new_thread_signals();
 	enable_timer();
 
 	if(!proc_mm){