powerpc: add __NR_syscalls along with NR_syscalls

NR_syscalls macro holds the number of system call exist
in powerpc 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 number of system call
information. So we have two option to update NR_syscalls
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 in 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: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/include/asm/unistd.h b/arch/powerpc/include/asm/unistd.h
index b0de85b477e1527051cb354980c5123670c8e212..a3c35e6d6ffbb05cb60cc3f25005905f09f56fdf 100644 (file)
--- a/arch/powerpc/include/asm/unistd.h
+++ b/arch/powerpc/include/asm/unistd.h
@@ -11,8 +11,7 @@
 
 #include <uapi/asm/unistd.h>
 
-
-#define NR_syscalls            389
+#define NR_syscalls    __NR_syscalls
 
 #define __NR__exit __NR_exit
 

diff --git a/arch/powerpc/include/uapi/asm/unistd.h b/arch/powerpc/include/uapi/asm/unistd.h
index 985534d0b448b7ae7b9d4cad7c3f9257d4ce0789..71958681a9acc5b35b362a78a5c578d071a531b4 100644 (file)
--- a/arch/powerpc/include/uapi/asm/unistd.h
+++ b/arch/powerpc/include/uapi/asm/unistd.h
@@ -10,7 +10,6 @@
 #ifndef _UAPI_ASM_POWERPC_UNISTD_H_
 #define _UAPI_ASM_POWERPC_UNISTD_H_
 
-
 #define __NR_restart_syscall     0
 #define __NR_exit                1
 #define __NR_fork                2
@@ -401,4 +400,8 @@
 #define __NR_rseq              387
 #define __NR_io_pgetevents     388
 
+#ifdef __KERNEL__
+#define __NR_syscalls          389
+#endif
+
 #endif /* _UAPI_ASM_POWERPC_UNISTD_H_ */