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From: Firoz Khan <>
To:, Richard Henderson <>,
	Ivan Kokshaysky <>,
	Matt Turner <>,
	Thomas Gleixner <>,
	Greg Kroah-Hartman <>,
	Philippe Ombredanne <>,
	Kate Stewart <>
Subject: [PATCH v3 3/5] alpha: add __NR_syscalls along with NR_SYSCALLS
Date: Tue, 13 Nov 2018 15:01:51 +0530	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

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 <>
 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 4f0ceb3..21b706a 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
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 /* _UAPI_ALPHA_UNISTD_H */

  parent reply	other threads:[~2018-11-13  9:32 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-13  9:31 [PATCH v3 0/5] alpha: system call table generation support Firoz Khan
2018-11-13  9:31 ` [PATCH v3 1/5] alpha: move __IGNORE* entries to non uapi header Firoz Khan
2018-11-13  9:31 ` [PATCH v3 2/5] alpha: remove CONFIG_OSF4_COMPAT flag from syscall table Firoz Khan
2018-11-13  9:31 ` Firoz Khan [this message]
2018-11-13  9:31 ` [PATCH v3 4/5] alpha: add system call table generation support Firoz Khan
2018-11-13  9:31 ` [PATCH v3 5/5] alpha: generate uapi header and syscall table header files Firoz Khan
2018-12-14 15:17 ` [PATCH v3 0/5] alpha: system call table generation support Firoz Khan
2018-12-19 15:59   ` Matt Turner
2018-12-19 17:08     ` Arnd Bergmann
2018-12-21 16:46       ` Matt Turner
2018-12-22 10:27         ` Stephen Rothwell

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