ia64: add __NR_syscalls along with NR_syscalls

NR_syscalls macro holds the number of system call exist
in ia64 architecture. We have to change the value of NR-
_syscalls, if we add or delete a system call.

One of the patch in this patch series has a script which
will generate a uapi header based on syscall.tbl file.
The syscall.tbl file contains the total number of system
calls information. So we have two option to update NR_sy-
scalls value.

1. Update NR_syscalls in asm/unistd.h manually by count-
   ing the no.of system calls. No need to update NR_sys-
   calls until we either add a new system call or delete
   existing system call.

2. We can keep this feature it above mentioned script,
   that will count the number of syscalls and keep it in
   a generated file. In this case we don't need to expli-
   citly update NR_syscalls in asm/unistd.h file.

The 2nd option will be the recommended one. For that, I
added the __NR_syscalls macro in uapi/asm/unistd.h along
with NR_syscalls asm/unistd.h. The macro __NR_syscalls
also added for making the name convention same across all
architecture. While __NR_syscalls isn't strictly part of
the uapi, having it as part of the generated header to
simplifies the implementation. We also need to enclose
this macro with #ifdef __KERNEL__ to avoid side effects.

Signed-off-by: Firoz Khan <firoz.khan@linaro.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/include/asm/unistd.h

@@ -10,9 +10,7 @@
 
 #include <uapi/asm/unistd.h>
 
-
-
-#define NR_syscalls			326 /* length of syscall table */
+#define NR_syscalls		__NR_syscalls /* length of syscall table */
 
 /*
  * The following defines stop scripts/checksyscalls.sh from complaining about

arch/ia64/include/uapi/asm/unistd.h

@@ -341,4 +341,8 @@
 #define __NR_preadv2			1348
 #define __NR_pwritev2			1349
 
+#ifdef __KERNEL__
+#define __NR_syscalls			326
+#endif
+
 #endif /* _UAPI_ASM_IA64_UNISTD_H */