new helper: sigsuspend()

guts of saved_sigmask-based sigsuspend/rt_sigsuspend.  Takes
kernel sigset_t *.

Open-coded instances replaced with calling it.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 16 insertions, 9 deletions

diff --git a/kernel/signal.c b/kernel/signal.c
index 17afcaf582d0..3ad220a81619 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3236,6 +3236,21 @@ SYSCALL_DEFINE0(pause)
 
 #endif
 
+#ifdef HAVE_SET_RESTORE_SIGMASK
+int sigsuspend(sigset_t *set)
+{
+        sigdelsetmask(set, sigmask(SIGKILL)|sigmask(SIGSTOP));
+
+        current->saved_sigmask = current->blocked;
+        set_current_blocked(set);
+
+        current->state = TASK_INTERRUPTIBLE;
+        schedule();
+        set_restore_sigmask();
+        return -ERESTARTNOHAND;
+}
+#endif
+
 #ifdef __ARCH_WANT_SYS_RT_SIGSUSPEND
 /**
  *  sys_rt_sigsuspend - replace the signal mask for a value with the
@@ -3253,15 +3268,7 @@ SYSCALL_DEFINE2(rt_sigsuspend, sigset_t __user *, unewset, size_t, sigsetsize)
 
         if (copy_from_user(&newset, unewset, sizeof(newset)))
                 return -EFAULT;
-        sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
-
-        current->saved_sigmask = current->blocked;
-        set_current_blocked(&newset);
-
-        current->state = TASK_INTERRUPTIBLE;
-        schedule();
-        set_restore_sigmask();
-        return -ERESTARTNOHAND;
+        return sigsuspend(&newset);
 }
 #endif /* __ARCH_WANT_SYS_RT_SIGSUSPEND */