[PATCH v4 1/3] microblaze: move __NR_syscalls macro from asm/unistd.h

From: Firoz Khan
Date: Tue Nov 13 2018 - 01:05:07 EST


__NR_syscalls holds the number of system call exist in
microblaze 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-
_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 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
moved the __NR_syscalls macro from asm/unistd.h to uapi-
/asm/unistd.h. 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@xxxxxxxxxx>
---
arch/microblaze/include/asm/unistd.h | 2 --
arch/microblaze/include/uapi/asm/unistd.h | 4 ++++
2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/microblaze/include/asm/unistd.h b/arch/microblaze/include/asm/unistd.h
index f42c40f..9b7c2c4 100644
--- a/arch/microblaze/include/asm/unistd.h
+++ b/arch/microblaze/include/asm/unistd.h
@@ -38,6 +38,4 @@

#endif /* __ASSEMBLY__ */

-#define __NR_syscalls 401
-
#endif /* _ASM_MICROBLAZE_UNISTD_H */
diff --git a/arch/microblaze/include/uapi/asm/unistd.h b/arch/microblaze/include/uapi/asm/unistd.h
index 7a9f16a..1c3f867 100644
--- a/arch/microblaze/include/uapi/asm/unistd.h
+++ b/arch/microblaze/include/uapi/asm/unistd.h
@@ -418,4 +418,8 @@
#define __NR_io_pgetevents 399
#define __NR_rseq 400

+#ifdef __KERNEL__
+#define __NR_syscalls 401
+#endif
+
#endif /* _UAPI_ASM_MICROBLAZE_UNISTD_H */
--
1.9.1