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Subject[PATCH v3 1/3] sh: add __NR_syscalls along with NR_syscalls
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NR_syscalls macro holds the number of system call exist
in sh 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_32/64.h
along with NR_syscalls which is moved to asm/unistd.h.
The macro __NR_syscalls also added for making the name
convention same across all architecture. While __NR_sys-
calls 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>
---
arch/sh/include/asm/unistd.h | 2 ++
arch/sh/include/uapi/asm/unistd_32.h | 4 +++-
arch/sh/include/uapi/asm/unistd_64.h | 4 +++-
3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/sh/include/asm/unistd.h b/arch/sh/include/asm/unistd.h
index a99234b..a97f93c 100644
--- a/arch/sh/include/asm/unistd.h
+++ b/arch/sh/include/asm/unistd.h
@@ -5,6 +5,8 @@
# include <asm/unistd_64.h>
# endif

+#define NR_syscalls __NR_syscalls
+
# define __ARCH_WANT_NEW_STAT
# define __ARCH_WANT_OLD_READDIR
# define __ARCH_WANT_OLD_STAT
diff --git a/arch/sh/include/uapi/asm/unistd_32.h b/arch/sh/include/uapi/asm/unistd_32.h
index 58f04cf..31c85aa 100644
--- a/arch/sh/include/uapi/asm/unistd_32.h
+++ b/arch/sh/include/uapi/asm/unistd_32.h
@@ -396,6 +396,8 @@
#define __NR_preadv2 381
#define __NR_pwritev2 382

-#define NR_syscalls 383
+#ifdef __KERNEL__
+#define __NR_syscalls 383
+#endif

#endif /* __ASM_SH_UNISTD_32_H */
diff --git a/arch/sh/include/uapi/asm/unistd_64.h b/arch/sh/include/uapi/asm/unistd_64.h
index 6f809a5..75da548 100644
--- a/arch/sh/include/uapi/asm/unistd_64.h
+++ b/arch/sh/include/uapi/asm/unistd_64.h
@@ -416,6 +416,8 @@
#define __NR_preadv2 392
#define __NR_pwritev2 393

-#define NR_syscalls 394
+#ifdef __KERNEL__
+#define __NR_syscalls 394
+#endif

#endif /* __ASM_SH_UNISTD_64_H */
--
1.9.1
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