[PATCH] m68knommu spinlocks around signal api calls

This adds spinlocks around calls to generic kernel signal routine calls.

arch/m68knommu/kernel/signal.c

@@ -63,9 +63,11 @@ asmlinkage int do_sigsuspend(struct pt_regs *regs)
 	sigset_t saveset;
 
 	mask &= _BLOCKABLE;
+	spin_lock_irq(&current->sig->siglock);
 	saveset = current->blocked;
 	siginitset(&current->blocked, mask);
 	recalc_sigpending();
+	spin_unlock_irq(&current->sig->siglock);
 
 	regs->d0 = -EINTR;
 	while (1) {
@@ -91,9 +93,11 @@ do_rt_sigsuspend(struct pt_regs *regs)
 		return -EFAULT;
 	sigdelsetmask(&newset, ~_BLOCKABLE);
 
+	spin_lock_irq(&current->sig->siglock);
 	saveset = current->blocked;
 	current->blocked = newset;
 	recalc_sigpending();
+	spin_unlock_irq(&current->sig->siglock);
 
 	regs->d0 = -EINTR;
 	while (1) {
@@ -366,8 +370,10 @@ asmlinkage int do_sigreturn(unsigned long __unused)
 		goto badframe;
 
 	sigdelsetmask(&set, ~_BLOCKABLE);
+	spin_lock_irq(&current->sig->siglock);
 	current->blocked = set;
 	recalc_sigpending();
+	spin_unlock_irq(&current->sig->siglock);
 	
 	if (restore_sigcontext(regs, &frame->sc, frame + 1, &d0))
 		goto badframe;
@@ -393,8 +399,10 @@ asmlinkage int do_rt_sigreturn(unsigned long __unused)
 		goto badframe;
 
 	sigdelsetmask(&set, ~_BLOCKABLE);
+	spin_lock_irq(&current->sig->siglock);
 	current->blocked = set;
 	recalc_sigpending();
+	spin_unlock_irq(&current->sig->siglock);
 	
 	if (rt_restore_ucontext(regs, sw, &frame->uc, &d0))
 		goto badframe;
@@ -729,10 +737,13 @@ handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
 	if (ka->sa.sa_flags & SA_ONESHOT)
 		ka->sa.sa_handler = SIG_DFL;
 
-	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
-	if (!(ka->sa.sa_flags & SA_NODEFER))
+	if (!(ka->sa.sa_flags & SA_NODEFER)) {
+		spin_lock_irq(&current->sig->siglock);
+		sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
 		sigaddset(&current->blocked,sig);
-	recalc_sigpending();
+		recalc_sigpending();
+		spin_unlock_irq(&current->sig->siglock);
+	}
 }
 
 /*