[POWERPC] Check that the syscall table matches the syscall numbers

Also check that __NR_syscalls has been updated appropriately.

Hopefully this will catch any out of order additions to the
table in the future.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 9374bc9..d9b3770 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -91,3 +91,13 @@
 
 extra-$(CONFIG_PPC_FPU)		+= fpu.o
 extra-$(CONFIG_PPC64)		+= entry_64.o
+
+extra-y				+= systbl_chk.i
+$(obj)/systbl.o:		systbl_chk
+
+quiet_cmd_systbl_chk = CALL    $<
+      cmd_systbl_chk = $(CONFIG_SHELL) $< $(obj)/systbl_chk.i
+
+PHONY += systbl_chk
+systbl_chk: $(src)/systbl_chk.sh $(obj)/systbl_chk.i
+	$(call cmd,systbl_chk)