linux-kernel - [PATCH 2/4] parisc: Replace __NR_Linux_syscalls macro with __NR

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Message-Id: <1536913603-4584-3-git-send-email-firoz.khan@linaro.org>
Date:   Fri, 14 Sep 2018 13:56:41 +0530
From:   Firoz Khan <firoz.khan@...aro.org>
To:     Thibaut Varene <T-Bone@...isc-linux.org>,
        linux-parisc@...r.kernel.org,
        "James E . J . Bottomley" <jejb@...isc-linux.org>,
        Helge Deller <deller@....de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kate Stewart <kstewart@...uxfoundation.org>
Cc:     y2038@...ts.linaro.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, arnd@...db.de, deepa.kernel@...il.com,
        marcin.juszkiewicz@...aro.org, firoz.khan@...aro.org
Subject: [PATCH 2/4] parisc: Replace __NR_Linux_syscalls macro with __NR_syscalls

__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 information. So we have two option to update
__NR_Linux_syscalls value.

1. Update __NR_Linux_syscalls in uapi/asm/unistd.h manually by counting
   the no.of system calls. No need to update NR_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'll
   count the number of syscalls and keep it in a generated 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 name also changed form __NR_Linux_syscalls to __NR_syscalls 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.

Signed-off-by: Firoz Khan <firoz.khan@...aro.org>
---
 arch/parisc/include/asm/unistd.h      | 2 ++
 arch/parisc/include/uapi/asm/unistd.h | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/parisc/include/asm/unistd.h b/arch/parisc/include/asm/unistd.h
index fc71edf..71417c1 100644
--- a/arch/parisc/include/asm/unistd.h
+++ b/arch/parisc/include/asm/unistd.h
@@ -8,6 +8,8 @@

 #define SYS_ify(syscall_name)   __NR_##syscall_name

+#define __NR_Linux_syscalls __NR_syscalls
+
 #ifndef ASM_LINE_SEP
 # define ASM_LINE_SEP ;
 #endif
diff --git a/arch/parisc/include/uapi/asm/unistd.h b/arch/parisc/include/uapi/asm/unistd.h
index bb52e12..7532817 100644
--- a/arch/parisc/include/uapi/asm/unistd.h
+++ b/arch/parisc/include/uapi/asm/unistd.h
@@ -366,7 +366,7 @@
 #define __NR_statx		(__NR_Linux + 349)
 #define __NR_io_pgetevents	(__NR_Linux + 350)

-#define __NR_Linux_syscalls	(__NR_io_pgetevents + 1)
+#define __NR_syscalls           (__NR_Linux + 351)

 #define LINUX_GATEWAY_ADDR      0x100

-- 
1.9.1