[v4,2/4] m68k: add __NR_syscalls along with NR_syscalls
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Message ID 1540530377-3509-3-git-send-email-firoz.khan@linaro.org
State Superseded
Headers show
  • m68k: system call table generation support
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Commit Message

Firoz Khan Oct. 26, 2018, 5:06 a.m. UTC
NR_syscalls macro holds the number of system call exist
in m68k 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 <firoz.khan@linaro.org>
 arch/m68k/include/asm/unistd.h      | 3 +--
 arch/m68k/include/uapi/asm/unistd.h | 4 ++++
 2 files changed, 5 insertions(+), 2 deletions(-)

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diff --git a/arch/m68k/include/asm/unistd.h b/arch/m68k/include/asm/unistd.h
index 30d0d3f..5072e94 100644
--- a/arch/m68k/include/asm/unistd.h
+++ b/arch/m68k/include/asm/unistd.h
@@ -4,8 +4,7 @@ 
 #include <uapi/asm/unistd.h>
-#define NR_syscalls		380
+#define NR_syscalls __NR_syscalls
diff --git a/arch/m68k/include/uapi/asm/unistd.h b/arch/m68k/include/uapi/asm/unistd.h
index de3054f..ba4176aa 100644
--- a/arch/m68k/include/uapi/asm/unistd.h
+++ b/arch/m68k/include/uapi/asm/unistd.h
@@ -387,4 +387,8 @@ 
 #define __NR_pwritev2		378
 #define __NR_statx		379
+#ifdef __KERNEL__
+#define __NR_syscalls		380
 #endif /* _UAPI_ASM_M68K_UNISTD_H_ */