lkml.org 
[lkml]   [2018]   [Nov]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v7 2/5] parisc: add __NR_syscalls along with __NR_Linux_syscalls
Date
__NR_Linux_syscalls macro holds the number of system call
exist in parisc architecture. We have to change the value
of __NR_Linux_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-
_Linux_syscalls value.

1. Update __NR_Linux_syscalls in asm/unistd.h manually by
counting the no.of system calls. No need to update __NR-
_Linux_syscalls 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_Linux_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_Linux_syscalls asm/unistd.h. The macro __NR_sys-
calls 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@linaro.org>
---
arch/parisc/include/asm/unistd.h | 2 ++
arch/parisc/include/uapi/asm/unistd.h | 6 ++++--
2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/parisc/include/asm/unistd.h b/arch/parisc/include/asm/unistd.h
index fd1013f..c2c2afb 100644
--- a/arch/parisc/include/asm/unistd.h
+++ b/arch/parisc/include/asm/unistd.h
@@ -4,6 +4,8 @@

#include <uapi/asm/unistd.h>

+#define __NR_Linux_syscalls __NR_syscalls
+
#ifndef __ASSEMBLY__

#define SYS_ify(syscall_name) __NR_##syscall_name
diff --git a/arch/parisc/include/uapi/asm/unistd.h b/arch/parisc/include/uapi/asm/unistd.h
index bb52e12..53cc748 100644
--- a/arch/parisc/include/uapi/asm/unistd.h
+++ b/arch/parisc/include/uapi/asm/unistd.h
@@ -366,8 +366,10 @@
#define __NR_statx (__NR_Linux + 349)
#define __NR_io_pgetevents (__NR_Linux + 350)

-#define __NR_Linux_syscalls (__NR_io_pgetevents + 1)
+#ifdef __KERNEL__
+#define __NR_syscalls 351
+#endif

-#define LINUX_GATEWAY_ADDR 0x100
+#define LINUX_GATEWAY_ADDR 0x100

#endif /* _UAPI_ASM_PARISC_UNISTD_H_ */
--
1.9.1
\
 
 \ /
  Last update: 2018-11-14 07:37    [W:0.088 / U:0.148 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site