linux-kernel - [PATCH v2 3/5] alpha: add __NR_syscalls along with NR

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Message-Id: <1541079817-3431-4-git-send-email-firoz.khan@linaro.org>
Date:   Thu,  1 Nov 2018 19:13:35 +0530
From:   Firoz Khan <firoz.khan@...aro.org>
To:     linux-alpha@...r.kernel.org, Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        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 v2 3/5] alpha: add __NR_syscalls along with NR_SYSCALLS

NR_SYSCALLS macro holds the number of system call exist
in alpha 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-
CALLS 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.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 implementation. We also need to enclose
this macro with #ifdef __KERNEL__ to avoid side effects.

Signed-off-by: Firoz Khan <firoz.khan@...aro.org>
---
 arch/alpha/include/asm/unistd.h      | 2 +-
 arch/alpha/include/uapi/asm/unistd.h | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/alpha/include/asm/unistd.h b/arch/alpha/include/asm/unistd.h
index cbd04d3..65a5056 100644
--- a/arch/alpha/include/asm/unistd.h
+++ b/arch/alpha/include/asm/unistd.h
@@ -4,7 +4,7 @@

 #include <uapi/asm/unistd.h>

-#define NR_SYSCALLS			523
+#define NR_SYSCALLS	__NR_syscalls

 #define __ARCH_WANT_OLD_READDIR
 #define __ARCH_WANT_STAT64
diff --git a/arch/alpha/include/uapi/asm/unistd.h b/arch/alpha/include/uapi/asm/unistd.h
index 47c65f1..ab40aa6 100644
--- a/arch/alpha/include/uapi/asm/unistd.h
+++ b/arch/alpha/include/uapi/asm/unistd.h
@@ -465,4 +465,8 @@
 #define __NR_pwritev2			521
 #define __NR_statx			522

+#ifdef __KERNEL__
+#define __NR_syscalls			523
+#endif
+
 #endif /* _UAPI_ALPHA_UNISTD_H */
-- 
1.9.1