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From:   Firoz Khan <firoz.khan@linaro.org>
To:     Geert Uytterhoeven <geert@linux-m68k.org>,
        linux-m68k@lists.linux-m68k.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Philippe Ombredanne <pombredanne@nexb.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Kate Stewart <kstewart@linuxfoundation.org>
Cc:     y2038@lists.linaro.org, linux-kernel@vger.kernel.org,
        linux-arch@vger.kernel.org, arnd@arndb.de, deepa.kernel@gmail.com,
        marcin.juszkiewicz@linaro.org, firoz.khan@linaro.org
Subject: [PATCH v5 1/3] m68k: add __NR_syscalls along with NR_syscalls
Date:   Tue, 13 Nov 2018 11:30:27 +0530
Message-Id: <1542088829-19790-2-git-send-email-firoz.khan@linaro.org>
In-Reply-To: <1542088829-19790-1-git-send-email-firoz.khan@linaro.org>
References: <1542088829-19790-1-git-send-email-firoz.khan@linaro.org>
Sender: linux-kernel-owner@vger.kernel.org
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NR_syscalls macro holds the number of system call
exist in m68k 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
   counting the no.of system calls. No need to up-
   date NR_syscalls until we either add a new sys-
   tem call or delete existing system call.

2. We can keep this feature it above mentioned sc-
   ript, that will count the number of syscalls and
   keep it in a generated file. In this case we
   don't need to explicitly 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 implement-
ation. We also need to enclose this macro with #ifdef
__KERNEL__ to avoid side effects.

Signed-off-by: Firoz Khan <firoz.khan@linaro.org>
---
 arch/m68k/include/asm/unistd.h      | 3 +--
 arch/m68k/include/uapi/asm/unistd.h | 4 ++++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/m68k/include/asm/unistd.h b/arch/m68k/include/asm/unistd.h
index e680031..49d5de1 100644
--- a/arch/m68k/include/asm/unistd.h
+++ b/arch/m68k/include/asm/unistd.h
@@ -4,8 +4,7 @@
 
 #include <uapi/asm/unistd.h>
 
-
-#define NR_syscalls		380
+#define NR_syscalls	__NR_syscalls
 
 #define __ARCH_WANT_NEW_STAT
 #define __ARCH_WANT_OLD_READDIR
diff --git a/arch/m68k/include/uapi/asm/unistd.h b/arch/m68k/include/uapi/asm/unistd.h
index de3054f..ba4176aa 100644
--- a/arch/m68k/include/uapi/asm/unistd.h
+++ b/arch/m68k/include/uapi/asm/unistd.h
@@ -387,4 +387,8 @@
 #define __NR_pwritev2		378
 #define __NR_statx		379
 
+#ifdef __KERNEL__
+#define __NR_syscalls		380
+#endif
+
 #endif /* _UAPI_ASM_M68K_UNISTD_H_ */
-- 
1.9.1