[PATCH 25/40] parisc: Use set_current_blocked() and block_sigmask()

[PATCH 25/40] parisc: Use set_current_blocked() and block_sigmask()

[Matt Fleming]

From: Matt Fleming <matt.fleming@intel.com>

As described in e6fa16ab ("signal: sigprocmask() should do
retarget_shared_pending()") the modification of current->blocked is
incorrect as we need to check whether the signal we're about to block
is pending in the shared queue.

Also, use the new helper function introduced in commit 5e6292c0f28f
("signal: add block_sigmask() for adding sigmask to current->blocked")
which centralises the code for updating current->blocked after
successfully delivering a signal and reduces the amount of duplicate
code across architectures. In the past some architectures got this
code wrong, so using this helper function should stop that from
happening again.

Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: linux-parisc@vger.kernel.org
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
---
 arch/parisc/kernel/signal.c |   12 ++----------
 1 files changed, 2 insertions(+), 10 deletions(-)

diff --git a/arch/parisc/kernel/signal.c b/arch/parisc/kernel/signal.c
index 12c1ed3..bd36152 100644
--- a/arch/parisc/kernel/signal.c
+++ b/arch/parisc/kernel/signal.c
@@ -131,10 +131,7 @@ sys_rt_sigreturn(struct pt_regs *regs, int in_syscall)
 	}
 		
 	sigdelsetmask(&set, ~_BLOCKABLE);
-	spin_lock_irq(&current->sighand->siglock);
-	current->blocked = set;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+	set_current_blocked(&set);
 
 	/* Good thing we saved the old gr[30], eh? */
 #ifdef CONFIG_64BIT
@@ -454,12 +451,7 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
 	if (!setup_rt_frame(sig, ka, info, oldset, regs, in_syscall))
 		return 0;
 
-	spin_lock_irq(&current->sighand->siglock);
-	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
-	if (!(ka->sa.sa_flags & SA_NODEFER))
-		sigaddset(&current->blocked,sig);
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+	block_sigmask(ka, sig);
 
 	tracehook_signal_handler(sig, info, ka, regs, 
 		test_thread_flag(TIF_SINGLESTEP) ||
-- 
1.7.4.4

Re: [PATCH 25/40] parisc: Use set_current_blocked() and block_sigmask()

[Kyle McMartin]

On Tue, Feb 14, 2012 at 11:40:58AM +0000, Matt Fleming wrote:
> From: Matt Fleming <matt.fleming@intel.com>
> 
> As described in e6fa16ab ("signal: sigprocmask() should do
> retarget_shared_pending()") the modification of current->blocked is
> incorrect as we need to check whether the signal we're about to block
> is pending in the shared queue.
> 
> Also, use the new helper function introduced in commit 5e6292c0f28f
> ("signal: add block_sigmask() for adding sigmask to current->blocked")
> which centralises the code for updating current->blocked after
> successfully delivering a signal and reduces the amount of duplicate
> code across architectures. In the past some architectures got this
> code wrong, so using this helper function should stop that from
> happening again.
> 
> Cc: Oleg Nesterov <oleg@redhat.com>
> Cc: Kyle McMartin <kyle@mcmartin.ca>
> Cc: Helge Deller <deller@gmx.de>
> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
> Cc: linux-parisc@vger.kernel.org
> Signed-off-by: Matt Fleming <matt.fleming@intel.com>

Nice cleanups Matt!

Acked-by: Kyle McMartin <kyle@mcmartin.ca>