[PATCH v5 2/5] parisc: add __NR_syscalls along with __NR_Linux_syscalls

From: Firoz Khan
Date: Tue Oct 16 2018 - 03:04:20 EST

__NR_Linux_syscalls macro holds the number of system call
exist in PARISC architecture. This macro is currently the
part of uapi/asm/unistd.h file. We have to change the value
of __NR_Linux_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 inform-
ation. So we have two option to update __NR_Linux_syscalls

1. Update __NR_Linux_syscalls in uapi/asm/unistd.h manually
by counting the no.of system calls. No need to update
__NR_Linux_syscalls until we either add a new system call
or delete an 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 gener-
ated file. In this case we don't need to explicitly update
__NR_Linux_syscalls in asm/unistd.h file.

The 2nd option will be the recommended one. For that, I moved
the __NR_Linux_syscalls macro from uapi/asm/unistd.h 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@xxxxxxxxxx>
arch/parisc/include/asm/unistd.h | 2 ++
arch/parisc/include/uapi/asm/unistd.h | 4 +++-
2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/parisc/include/asm/unistd.h b/arch/parisc/include/asm/unistd.h
index 93fd9f6..d30fdbcb 100644
--- a/arch/parisc/include/asm/unistd.h
+++ b/arch/parisc/include/asm/unistd.h
@@ -4,6 +4,8 @@

#include <uapi/asm/unistd.h>

+#define __NR_Linux_syscalls __NR_syscalls
#ifndef __ASSEMBLY__

#define SYS_ify(syscall_name) __NR_##syscall_name
diff --git a/arch/parisc/include/uapi/asm/unistd.h b/arch/parisc/include/uapi/asm/unistd.h
index bb52e12..f10d065 100644
--- a/arch/parisc/include/uapi/asm/unistd.h
+++ b/arch/parisc/include/uapi/asm/unistd.h
@@ -366,7 +366,9 @@
#define __NR_statx (__NR_Linux + 349)
#define __NR_io_pgetevents (__NR_Linux + 350)

-#define __NR_Linux_syscalls (__NR_io_pgetevents + 1)
+#ifdef __KERNEL__
+#define __NR_syscalls 351

#define LINUX_GATEWAY_ADDR 0x100