[v6,2/5] parisc: add __NR_syscalls along with __NR_Linux_syscalls
diff mbox series

Message ID 1540530791-3961-3-git-send-email-firoz.khan@linaro.org
State Superseded
Headers show
  • parisc: system call table generation support
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Commit Message

Firoz Khan Oct. 26, 2018, 5:13 a.m. UTC
__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 | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff mbox series

diff --git a/arch/parisc/include/asm/unistd.h b/arch/parisc/include/asm/unistd.h
index 93fd9f6..d30fdbcb 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..f10d065 100644
--- a/arch/parisc/include/uapi/asm/unistd.h
+++ b/arch/parisc/include/uapi/asm/unistd.h
@@ -366,7 +366,9 @@ 
 #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
 #define LINUX_GATEWAY_ADDR      0x100