Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

Pull third pile of signal handling patches from Al Viro:
 "This time it's mostly helpers and conversions to them; there's a lot
  of stuff remaining in the tree, but that'll either go in -rc2
  (isolated bug fixes, ideally via arch maintainers' trees) or will sit
  there until the next cycle."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal:
  x86: get rid of calling do_notify_resume() when returning to kernel mode
  blackfin: check __get_user() return value
  whack-a-mole with TIF_FREEZE
  FRV: Optimise the system call exit path in entry.S [ver #2]
  FRV: Shrink TIF_WORK_MASK [ver #2]
  FRV: Prevent syscall exit tracing and notify_resume at end of kernel exceptions
  new helper: signal_delivered()
  powerpc: get rid of restore_sigmask()
  most of set_current_blocked() callers want SIGKILL/SIGSTOP removed from set
  set_restore_sigmask() is never called without SIGPENDING (and never should be)
  TIF_RESTORE_SIGMASK can be set only when TIF_SIGPENDING is set
  don't call try_to_freeze() from do_signal()
  pull clearing RESTORE_SIGMASK into block_sigmask()
  sh64: failure to build sigframe != signal without handler
  openrisc: tracehook_signal_handler() is supposed to be called on success
  new helper: sigmask_to_save()
  new helper: restore_saved_sigmask()
  new helpers: {clear,test,test_and_clear}_restore_sigmask()
  HAVE_RESTORE_SIGMASK is defined on all architectures now

1 files changed, 7 insertions, 25 deletions

diff --git a/arch/m32r/kernel/signal.c b/arch/m32r/kernel/signal.c
index 64804f1f5141..f3fb2c029cfc 100644
--- a/arch/m32r/kernel/signal.c
+++ b/arch/m32r/kernel/signal.c
@@ -28,8 +28,6 @@
 
 #define DEBUG_SIG 0
 
-#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
-
 asmlinkage int
 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
                 unsigned long r2, unsigned long r3, unsigned long r4,
@@ -111,7 +109,6 @@ sys_rt_sigreturn(unsigned long r0, unsigned long r1,
         if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
                 goto badframe;
 
-        sigdelsetmask(&set, ~_BLOCKABLE);
         set_current_blocked(&set);
 
         if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &result))
@@ -267,9 +264,9 @@ static int prev_insn(struct pt_regs *regs)
  * OK, we're invoking a handler
  */
 
-static int
+static void
 handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
-              sigset_t *oldset, struct pt_regs *regs)
+              struct pt_regs *regs)
 {
         /* Are we from a system call? */
         if (regs->syscall_nr >= 0) {
@@ -294,11 +291,10 @@ handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
         }
 
         /* Set up the stack frame */
-        if (setup_rt_frame(sig, ka, info, oldset, regs))
-                return -EFAULT;
+        if (setup_rt_frame(sig, ka, info, sigmask_to_save(), regs))
+                return;
 
-        block_sigmask(ka, sig);
-        return 0;
+        signal_delivered(sig, info, ka, regs, 0);
 }
 
 /*
@@ -311,7 +307,6 @@ static void do_signal(struct pt_regs *regs)
         siginfo_t info;
         int signr;
         struct k_sigaction ka;
-        sigset_t *oldset;
 
         /*
          * We want the common case to go fast, which
@@ -322,14 +317,6 @@ static void do_signal(struct pt_regs *regs)
         if (!user_mode(regs))
                 return;
 
-        if (try_to_freeze()) 
-                goto no_signal;
-
-        if (test_thread_flag(TIF_RESTORE_SIGMASK))
-                oldset = &current->saved_sigmask;
-        else
-                oldset = &current->blocked;
-
         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
         if (signr > 0) {
                 /* Re-enable any watchpoints before delivering the
@@ -339,13 +326,11 @@ static void do_signal(struct pt_regs *regs)
                  */
 
                 /* Whee!  Actually deliver the signal.  */
-                if (handle_signal(signr, &ka, &info, oldset, regs) == 0)
-                        clear_thread_flag(TIF_RESTORE_SIGMASK);
+                handle_signal(signr, &ka, &info, regs);
 
                 return;
         }
 
- no_signal:
         /* Did we come from a system call? */
         if (regs->syscall_nr >= 0) {
                 /* Restart the system call - no handlers present */
@@ -360,10 +345,7 @@ static void do_signal(struct pt_regs *regs)
                         prev_insn(regs);
                 }
         }
-        if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
-                clear_thread_flag(TIF_RESTORE_SIGMASK);
-                sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
-        }
+        restore_saved_sigmask();
 }
 
 /*