signal: simplify set_user_sigmask/restore_user_sigmask
task->saved_sigmask and ->restore_sigmask are only used in the ret-from-
syscall paths. This means that set_user_sigmask() can save ->blocked in
->saved_sigmask and do set_restore_sigmask() to indicate that ->blocked
was modified.
This way the callers do not need 2 sigset_t's passed to set/restore and
restore_user_sigmask() renamed to restore_saved_sigmask_unless() turns
into the trivial helper which just calls restore_saved_sigmask().
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Oleg Nesterov <[email protected]>
Cc: Deepa Dinamani <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Eric Wong <[email protected]>
Cc: Jason Baron <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Eric W. Biederman <[email protected]>
Cc: David Laight <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 4c74c768..0f9c073 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -2313,19 +2313,17 @@ SYSCALL_DEFINE6(epoll_pwait, int, epfd, struct epoll_event __user *, events,
size_t, sigsetsize)
{
int error;
- sigset_t ksigmask, sigsaved;
/*
* If the caller wants a certain signal mask to be set during the wait,
* we apply it here.
*/
- error = set_user_sigmask(sigmask, &ksigmask, &sigsaved, sigsetsize);
+ error = set_user_sigmask(sigmask, sigsetsize);
if (error)
return error;
error = do_epoll_wait(epfd, events, maxevents, timeout);
-
- restore_user_sigmask(sigmask, &sigsaved, error == -EINTR);
+ restore_saved_sigmask_unless(error == -EINTR);
return error;
}
@@ -2338,19 +2336,17 @@ COMPAT_SYSCALL_DEFINE6(epoll_pwait, int, epfd,
compat_size_t, sigsetsize)
{
long err;
- sigset_t ksigmask, sigsaved;
/*
* If the caller wants a certain signal mask to be set during the wait,
* we apply it here.
*/
- err = set_compat_user_sigmask(sigmask, &ksigmask, &sigsaved, sigsetsize);
+ err = set_compat_user_sigmask(sigmask, sigsetsize);
if (err)
return err;
err = do_epoll_wait(epfd, events, maxevents, timeout);
-
- restore_user_sigmask(sigmask, &sigsaved, err == -EINTR);
+ restore_saved_sigmask_unless(err == -EINTR);
return err;
}
