parisc: decide whether to go to slow path (tracesys) based on thread flags

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

arch/parisc/include/asm/thread_info.h

@@ -74,6 +74,8 @@ struct thread_info {
 
 #define _TIF_USER_WORK_MASK     (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | \
                                  _TIF_NEED_RESCHED)
+#define _TIF_SYSCALL_TRACE_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP |	\
+				 _TIF_BLOCKSTEP)
 
 #define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
 

arch/parisc/kernel/syscall.S

@@ -180,9 +180,10 @@ linux_gateway_entry:
 
 	/* Are we being ptraced? */
 	mfctl	%cr30, %r1
-	LDREG	TI_TASK(%r1),%r1
-	ldw	TASK_PTRACE(%r1), %r1
-	bb,<,n	%r1,31,.Ltracesys
+	LDREG	TI_FLAGS(%r1),%r1
+	ldi	_TIF_SYSCALL_TRACE_MASK, %r19
+	and,COND(=) %r1, %r19, %r0
+	b,n	.Ltracesys
 	
 	/* Note!  We cannot use the syscall table that is mapped
 	nearby since the gateway page is mapped execute-only. */