x86, signals: Convert the X86_32 code to use set_current_blocked()

sys_sigsuspend() and sys_sigreturn() change ->blocked directly.
This is not correct, see the changelog in e6fa16a
"signal: sigprocmask() should do retarget_shared_pending()"

Change them to use set_current_blocked().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Link: http://lkml.kernel.org/r/20110710192727.GA31759@redhat.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

arch/x86/kernel/signal.c

@@ -485,17 +485,18 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 asmlinkage int
 sys_sigsuspend(int history0, int history1, old_sigset_t mask)
 {
-	mask &= _BLOCKABLE;
-	spin_lock_irq(&current->sighand->siglock);
+	sigset_t blocked;
+
 	current->saved_sigmask = current->blocked;
-	siginitset(&current->blocked, mask);
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+
+	mask &= _BLOCKABLE;
+	siginitset(&blocked, mask);
+	set_current_blocked(&blocked);
 
 	current->state = TASK_INTERRUPTIBLE;
 	schedule();
-	set_restore_sigmask();
 
+	set_restore_sigmask();
 	return -ERESTARTNOHAND;
 }
 
@@ -572,10 +573,7 @@ unsigned long sys_sigreturn(struct pt_regs *regs)
 		goto badframe;
 
 	sigdelsetmask(&set, ~_BLOCKABLE);
-	spin_lock_irq(&current->sighand->siglock);
-	current->blocked = set;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+	set_current_blocked(&set);
 
 	if (restore_sigcontext(regs, &frame->sc, &ax))
 		goto badframe;