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From: Firoz Khan <>
To: "David S . Miller" <>,,
	Greg Kroah-Hartman <>,
	Philippe Ombredanne <>,
	Thomas Gleixner <>,
	Kate Stewart <>
Subject: [PATCH v2 2/4] sparc: add __NR_syscalls along with NR_syscalls
Date: Thu,  1 Nov 2018 19:23:09 +0530	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

NR_syscalls macro holds the number of system call exist
in sparc 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-
scalls 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/sparc/include/asm/unistd.h      | 2 ++
 arch/sparc/include/uapi/asm/unistd.h | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/sparc/include/asm/unistd.h b/arch/sparc/include/asm/unistd.h
index 6dfd752..171a6e5 100644
--- a/arch/sparc/include/asm/unistd.h
+++ b/arch/sparc/include/asm/unistd.h
@@ -17,6 +17,8 @@
 #include <uapi/asm/unistd.h>
+#define NR_syscalls	__NR_syscalls
 #ifdef __32bit_syscall_numbers__
 #define __NR_time		231 /* Linux sparc32                               */
diff --git a/arch/sparc/include/uapi/asm/unistd.h b/arch/sparc/include/uapi/asm/unistd.h
index 6e59037..e11d86c 100644
--- a/arch/sparc/include/uapi/asm/unistd.h
+++ b/arch/sparc/include/uapi/asm/unistd.h
@@ -428,7 +428,9 @@
 #define __NR_pwritev2		359
 #define __NR_statx		360
-#define NR_syscalls		361
+#ifdef __KERNEL__
+#define __NR_syscalls		361
 /* Bitmask values returned from kern_features system call.  */

  parent reply	other threads:[~2018-11-01 13:53 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-01 13:53 [PATCH v2 0/4] sparc: system call table generation support Firoz Khan
2018-11-01 13:53 ` [PATCH v2 1/4] sparc: move __IGNORE* entries to non uapi header Firoz Khan
2018-11-01 13:53 ` Firoz Khan [this message]
2018-11-01 13:53 ` [PATCH v2 3/4] sparc: add system call table generation support Firoz Khan
2018-11-01 20:33   ` David Miller
2018-11-02  5:39     ` Firoz Khan
2018-11-02  6:04       ` David Miller
2018-11-05 10:48     ` Arnd Bergmann
2018-11-06  4:28       ` David Miller
2018-11-01 13:53 ` [PATCH v2 4/4] sparc: generate uapi header and system call table files Firoz Khan

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