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_syscalls value.
1. Update NR_syscalls in asm/unistd.h manually by counting the no.of system calls. No need to up- date NR_syscalls until we either add a new sys- tem call or delete existing system call.
2. We can keep this feature it above mentioned sc- ript, that will count the number of syscalls and keep it in a generated file. In this case we don't need to explicitly 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 implement- ation. 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(-)
diff --git a/arch/m68k/include/asm/unistd.h b/arch/m68k/include/asm/unistd.h index e680031..49d5de1 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
#define __ARCH_WANT_NEW_STAT #define __ARCH_WANT_OLD_READDIR 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 + #endif /* _UAPI_ASM_M68K_UNISTD_H_ */