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From: Firoz Khan <>
	Benjamin Herrenschmidt <>,
	Paul Mackerras <>,
	Michael Ellerman <>,
	Ram Pai <>,
	Geert Uytterhoeven <>,
	Mathieu Desnoyers <>,
	Breno Leitao <>,
	Boqun Feng <>,
	Greg Kroah-Hartman <>,
	Philippe Ombredanne <>,
	Thomas Gleixner <>,
	Kate Stewart <>
Subject: [PATCH v4 1/5] powerpc: add __NR_syscalls along with NR_syscalls
Date: Fri,  7 Dec 2018 11:41:36 +0530
Message-ID: <> (raw)
In-Reply-To: <>

NR_syscalls macro holds the number of system call exist
in powerpc 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 number of system call
information. So we have two option to update NR_syscalls

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 in 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/powerpc/include/asm/unistd.h      | 3 +--
 arch/powerpc/include/uapi/asm/unistd.h | 5 ++++-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/include/asm/unistd.h b/arch/powerpc/include/asm/unistd.h
index b0de85b..a3c35e6 100644
--- a/arch/powerpc/include/asm/unistd.h
+++ b/arch/powerpc/include/asm/unistd.h
@@ -11,8 +11,7 @@
 #include <uapi/asm/unistd.h>
-#define NR_syscalls		389
+#define NR_syscalls	__NR_syscalls
 #define __NR__exit __NR_exit
diff --git a/arch/powerpc/include/uapi/asm/unistd.h b/arch/powerpc/include/uapi/asm/unistd.h
index 985534d..7195868 100644
--- a/arch/powerpc/include/uapi/asm/unistd.h
+++ b/arch/powerpc/include/uapi/asm/unistd.h
@@ -10,7 +10,6 @@
 #define __NR_restart_syscall	  0
 #define __NR_exit		  1
 #define __NR_fork		  2
@@ -401,4 +400,8 @@
 #define __NR_rseq		387
 #define __NR_io_pgetevents	388
+#ifdef __KERNEL__
+#define __NR_syscalls		389

  reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-07  6:11 [PATCH v4 0/5] powerpc: system call table generation support Firoz Khan
2018-12-07  6:11 ` Firoz Khan [this message]
2018-12-07  6:11 ` [PATCH v4 2/5] powerpc: move macro definition from asm/systbl.h Firoz Khan
2018-12-07  6:11 ` [PATCH v4 3/5] powerpc: add system call table generation support Firoz Khan
2018-12-07  6:11 ` [PATCH v4 4/5] powerpc: split compat syscall table out from native table Firoz Khan
2018-12-07  6:11 ` [PATCH v4 5/5] powerpc: generate uapi header and system call table files Firoz Khan
2018-12-12  9:24   ` kbuild test robot
2018-12-07  6:16 ` [PATCH v4 0/5] powerpc: system call table generation support Firoz Khan
2018-12-07  7:27 ` Satheesh Rajendran
2018-12-07  8:37   ` Firoz Khan

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