tile: Add definition of NR_syscalls

It is required by the syscall tracepoint mechanism.

Signed-off-by: Simon Marchi <simon.marchi@polymtl.ca>
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
diff --git a/arch/tile/include/uapi/asm/unistd.h b/arch/tile/include/uapi/asm/unistd.h
index cd7b6dd..3866397 100644
--- a/arch/tile/include/uapi/asm/unistd.h
+++ b/arch/tile/include/uapi/asm/unistd.h
@@ -20,6 +20,8 @@
 /* Use the standard ABI for syscalls. */
 #include <asm-generic/unistd.h>
 
+#define NR_syscalls __NR_syscalls
+
 /* Additional Tilera-specific syscalls. */
 #define __NR_cacheflush	(__NR_arch_specific_syscall + 1)
 __SYSCALL(__NR_cacheflush, sys_cacheflush)