[PATCH] uml: change interface to boot_timer_handler

Current implementation of boot_timer_handler isn't usable for s390. So I
changed its name to do_boot_timer_handler, taking (struct sigcontext *)sc as
argument. do_boot_timer_handler is called from new boot_timer_handler() in
arch/um/os-Linux/signal.c, which uses the same mechanisms as other signal
handler to find out sigcontext pointer.

Signed-off-by: Bodo Stroesser <[e-mail]>
Signed-off-by: Jeff Dike <[e-mail]>
Cc: Paolo 'Blaisorblade' Giarrusso <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/um/kernel/time_kern.c

···
 	}
 }
 
-void boot_timer_handler(int sig)
+void do_boot_timer_handler(struct sigcontext * sc)
 {
 	struct pt_regs regs;
 
-	CHOOSE_MODE((void)
-		    (UPT_SC(&regs.regs) = (struct sigcontext *) (&sig + 1)),
+	CHOOSE_MODE((void) (UPT_SC(&regs.regs) = sc),
 		    (void) (regs.regs.skas.is_user = 0));
 	do_timer(&regs);
 }

arch/um/os-Linux/signal.c

···
 #include <string.h>
 #include <sys/mman.h>
 #include "user_util.h"
-#include "kern_util.h"
 #include "user.h"
 #include "signal_kern.h"
 #include "sysdep/sigcontext.h"
···
 
 	if(sig == SIGALRM)
 		switch_timers(1);
+}
+
+extern void do_boot_timer_handler(struct sigcontext * sc);
+
+void boot_timer_handler(ARCH_SIGHDLR_PARAM)
+{
+	struct sigcontext *sc;
+
+	ARCH_GET_SIGCONTEXT(sc, sig);
+
+	do_boot_timer_handler(sc);
 }
 
 void set_sigstack(void *sig_stack, int size)