[AVR32] Add TIF_RESTORE_SIGMASK to the work masks

We really need to check TIF_RESTORE_SIGMASK before returning to
userspace. The existing code does not necessarily do this.

Define the work masks as a bitwise OR of the respective flags instead
of a hardcoded hex value to make it easier to spot errors like this in
the future.
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

include/asm-avr32/thread_info.h

@@ -95,12 +95,19 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
 #define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP)
 
-/* XXX: These two masks must never span more than 16 bits! */
+/* Note: The masks below must never span more than 16 bits! */
+
 /* work to do on interrupt/exception return */
-#define _TIF_WORK_MASK		0x0000013e
+#define _TIF_WORK_MASK				\
+	((1 << TIF_SIGPENDING)			\
+	 | (1 << TIF_NEED_RESCHED)		\
+	 | (1 << TIF_POLLING_NRFLAG)		\
+	 | (1 << TIF_BREAKPOINT)		\
+	 | (1 << TIF_RESTORE_SIGMASK))
+
 /* work to do on any return to userspace */
-#define _TIF_ALLWORK_MASK	0x0000013f
+#define _TIF_ALLWORK_MASK	(_TIF_WORK_MASK | (1 << TIF_SYSCALL_TRACE))
 /* work to do on return from debug mode */
-#define _TIF_DBGWORK_MASK	0x0000017e
+#define _TIF_DBGWORK_MASK	(_TIF_WORK_MASK | (1 << TIF_SINGLE_STEP))
 
 #endif /* __ASM_AVR32_THREAD_INFO_H */