[PATCH] xtensa: use valid_signal()

xtensa should use valid_signal() instead of testing _NSIG directly like
everyone else.
Signed-off-by: NJesper Juhl <juhl-lkml@dif.dk>
Cc: Chris Zankel <chris@zankel.net>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

arch/xtensa/kernel/ptrace.c

@@ -22,6 +22,7 @@
 #include <linux/smp.h>
 #include <linux/smp_lock.h>
 #include <linux/security.h>
+#include <linux/signal.h>
 
 #include <asm/pgtable.h>
 #include <asm/page.h>
@@ -239,7 +240,7 @@ int sys_ptrace(long request, long pid, long addr, long data)
 	case PTRACE_CONT: /* restart after signal. */
 	{
 		ret = -EIO;
-		if ((unsigned long) data > _NSIG)
+		if (!valid_signal(data))
 			break;
 		if (request == PTRACE_SYSCALL)
 			set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
@@ -269,7 +270,7 @@ int sys_ptrace(long request, long pid, long addr, long data)
 
 	case PTRACE_SINGLESTEP:
 		ret = -EIO;
-		if ((unsigned long) data > _NSIG)
+		if (!valid_signal(data))
 			break;
 		clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 		child->ptrace |= PT_SINGLESTEP;