[PATCH v2 04/17] signal: make do_sigpending() void

Christian Brauner
2018-06-01T13:25:56Z

do_sigpending() returned 0 unconditionally so it doesn't make sense to have
it return at all. This allows us to simplify a bunch of syscall callers.

Signed-off-by: Christian Brauner <christian@brauner.io>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
---
v1->v2:
* unchanged
v0->v1:
* unchanged
---
kernel/signal.c | 41 ++++++++++++++++++++---------------------
1 file changed, 20 insertions(+), 21 deletions(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index bc750fb4ddcc..7c770556b085 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2767,7 +2767,7 @@ COMPAT_SYSCALL_DEFINE4(rt_sigprocmask, int, how, compat_sigset_t __user *, nset,
}
#endif

-static int do_sigpending(sigset_t *set)
+static void do_sigpending(sigset_t *set)
{
spin_lock_irq(&current->sighand->siglock);
sigorsets(set, &current->pending.signal,
@@ -2776,7 +2776,6 @@ static int do_sigpending(sigset_t *set)

/* Outside the lock because only this thread touches it. */
sigandsets(set, &current->blocked, set);
- return 0;
}

/**
@@ -2788,15 +2787,16 @@ static int do_sigpending(sigset_t *set)
SYSCALL_DEFINE2(rt_sigpending, sigset_t __user *, uset, size_t, sigsetsize)
{
sigset_t set;
- int err;

if (sigsetsize > sizeof(*uset))
return -EINVAL;

- err = do_sigpending(&set);
- if (!err && copy_to_user(uset, &set, sigsetsize))
- err = -EFAULT;
- return err;
+ do_sigpending(&set);
+
+ if (copy_to_user(uset, &set, sigsetsize))
+ return -EFAULT;
+
+ return 0;
}

#ifdef CONFIG_COMPAT
@@ -2804,15 +2804,13 @@ COMPAT_SYSCALL_DEFINE2(rt_sigpending, compat_sigset_t __user *, uset,
compat_size_t, sigsetsize)
{
sigset_t set;
- int err;

if (sigsetsize > sizeof(*uset))
return -EINVAL;

- err = do_sigpending(&set);
- if (!err)
- err = put_compat_sigset(uset, &set, sigsetsize);
- return err;
+ do_sigpending(&set);
+
+ return put_compat_sigset(uset, &set, sigsetsize);
}
#endif

@@ -3647,25 +3645,26 @@ int __compat_save_altstack(compat_stack_t __user *uss, unsigned long sp)
SYSCALL_DEFINE1(sigpending, old_sigset_t __user *, uset)
{
sigset_t set;
- int err;

if (sizeof(old_sigset_t) > sizeof(*uset))
return -EINVAL;

- err = do_sigpending(&set);
- if (!err && copy_to_user(uset, &set, sizeof(old_sigset_t)))
- err = -EFAULT;
- return err;
+ do_sigpending(&set);
+
+ if (copy_to_user(uset, &set, sizeof(old_sigset_t)))
+ return -EFAULT;
+
+ return 0;
}

#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set32)
{
sigset_t set;
- int err = do_sigpending(&set);
- if (!err)
- err = put_user(set.sig[0], set32);
- return err;
+
+ do_sigpending(&set);
+
+ return put_user(set.sig[0], set32);
}
#endif

--
2.17.0