NR_syscalls macro holds the number of system call exist in MIPS architecture. This macro is currently not a part of uapi/asm/unistd.h file. The purpose of this macro is 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 value.
1. Update NR_syscalls in uapi/asm/unistd.h manually by counting the no.of system calls. No need to update NR_syscalls until we either add a new system call or delete an existing system call.
2. We can keep this feature it above mentioned script, that'll 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. While __NR_syscalls isn't strictly part of the uapi, having it as part of the generated header to simplifies the implementation.
Signed-off-by: Firoz Khan firoz.khan@linaro.org --- arch/mips/include/uapi/asm/unistd.h | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/arch/mips/include/uapi/asm/unistd.h b/arch/mips/include/uapi/asm/unistd.h index f25dd1d..f8bab34 100644 --- a/arch/mips/include/uapi/asm/unistd.h +++ b/arch/mips/include/uapi/asm/unistd.h @@ -390,17 +390,17 @@ #define __NR_statx (__NR_Linux + 366) #define __NR_rseq (__NR_Linux + 367) #define __NR_io_pgetevents (__NR_Linux + 368) - +#define __NR_syscalls 368
/* * Offset of the last Linux o32 flavoured syscall */ -#define __NR_Linux_syscalls 368 +#define __NR_Linux_syscalls __NR_syscalls
#endif /* _MIPS_SIM == _MIPS_SIM_ABI32 */
#define __NR_O32_Linux 4000 -#define __NR_O32_Linux_syscalls 368 +#define __NR_O32_Linux_syscalls __NR_syscalls
#if _MIPS_SIM == _MIPS_SIM_ABI64
@@ -737,16 +737,17 @@ #define __NR_statx (__NR_Linux + 326) #define __NR_rseq (__NR_Linux + 327) #define __NR_io_pgetevents (__NR_Linux + 328) +#define __NR_syscalls 328
/* * Offset of the last Linux 64-bit flavoured syscall */ -#define __NR_Linux_syscalls 328 +#define __NR_Linux_syscalls __NR_syscalls
#endif /* _MIPS_SIM == _MIPS_SIM_ABI64 */
#define __NR_64_Linux 5000 -#define __NR_64_Linux_syscalls 328 +#define __NR_64_Linux_syscalls __NR_syscalls
#if _MIPS_SIM == _MIPS_SIM_NABI32
@@ -1087,15 +1088,16 @@ #define __NR_statx (__NR_Linux + 330) #define __NR_rseq (__NR_Linux + 331) #define __NR_io_pgetevents (__NR_Linux + 332) +#define __NR_syscalls 332
/* * Offset of the last N32 flavoured syscall */ -#define __NR_Linux_syscalls 332 +#define __NR_Linux_syscalls __NR_syscalls
#endif /* _MIPS_SIM == _MIPS_SIM_NABI32 */
#define __NR_N32_Linux 6000 -#define __NR_N32_Linux_syscalls 332 +#define __NR_N32_Linux_syscalls __NR_syscalls
#endif /* _UAPI_ASM_UNISTD_H */