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authorOleg Nesterov <oleg@redhat.com>2011-04-27 21:18:10 +0200
committerOleg Nesterov <oleg@redhat.com>2011-04-28 13:01:38 +0200
commitbb7efee2ca63b08795ffb3cda96fc89d2e641b79 (patch)
tree05e05d78f815d9fb8f8963860d2287189a17d7b1 /kernel
parente9bd3f0faa90084f188830d77723bafe422e486b (diff)
signal: cleanup sys_rt_sigprocmask()
sys_rt_sigprocmask() looks unnecessarily complicated, simplify it. We can just read current->blocked lockless unconditionally before anything else and then copy-to-user it if needed. At worst we copy 4 words on mips. We could copy-to-user the old mask first and simplify the code even more, but the patch tries to keep the current behaviour: we change current->block even if copy_to_user(oset) fails. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Reviewed-by: Matt Fleming <matt.fleming@linux.intel.com> Acked-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/signal.c38
1 files changed, 16 insertions, 22 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index 8aa3a2e226af..bb9200070ea0 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2364,40 +2364,34 @@ int sigprocmask(int how, sigset_t *set, sigset_t *oldset)
* @oset: previous value of signal mask if non-null
* @sigsetsize: size of sigset_t type
*/
-SYSCALL_DEFINE4(rt_sigprocmask, int, how, sigset_t __user *, set,
+SYSCALL_DEFINE4(rt_sigprocmask, int, how, sigset_t __user *, nset,
sigset_t __user *, oset, size_t, sigsetsize)
{
- int error = -EINVAL;
sigset_t old_set, new_set;
+ int error;
/* XXX: Don't preclude handling different sized sigset_t's. */
if (sigsetsize != sizeof(sigset_t))
- goto out;
+ return -EINVAL;
- if (set) {
- error = -EFAULT;
- if (copy_from_user(&new_set, set, sizeof(*set)))
- goto out;
+ old_set = current->blocked;
+
+ if (nset) {
+ if (copy_from_user(&new_set, nset, sizeof(sigset_t)))
+ return -EFAULT;
sigdelsetmask(&new_set, sigmask(SIGKILL)|sigmask(SIGSTOP));
- error = sigprocmask(how, &new_set, &old_set);
+ error = sigprocmask(how, &new_set, NULL);
if (error)
- goto out;
- if (oset)
- goto set_old;
- } else if (oset) {
- spin_lock_irq(&current->sighand->siglock);
- old_set = current->blocked;
- spin_unlock_irq(&current->sighand->siglock);
+ return error;
+ }
- set_old:
- error = -EFAULT;
- if (copy_to_user(oset, &old_set, sizeof(*oset)))
- goto out;
+ if (oset) {
+ if (copy_to_user(oset, &old_set, sizeof(sigset_t)))
+ return -EFAULT;
}
- error = 0;
-out:
- return error;
+
+ return 0;
}
long do_sigpending(void __user *set, unsigned long sigsetsize)