__NR_Linux_syscalls macro holds the number of system call exist in mips 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. 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/mips/include/uapi/asm/unistd.h | 23 +++++++++++++++++------ 1 file changed, 17 insertions(+), 6 deletions(-)
diff --git a/arch/mips/include/uapi/asm/unistd.h b/arch/mips/include/uapi/asm/unistd.h index f25dd1d..0ccf954 100644 --- a/arch/mips/include/uapi/asm/unistd.h +++ b/arch/mips/include/uapi/asm/unistd.h @@ -391,16 +391,19 @@ #define __NR_rseq (__NR_Linux + 367) #define __NR_io_pgetevents (__NR_Linux + 368)
+#ifdef __KERNEL__ +#define __NR_syscalls 368 +#endif
/* * 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
@@ -738,15 +741,19 @@ #define __NR_rseq (__NR_Linux + 327) #define __NR_io_pgetevents (__NR_Linux + 328)
+#ifdef __KERNEL__ +#define __NR_syscalls 328 +#endif + /* * 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
@@ -1088,14 +1095,18 @@ #define __NR_rseq (__NR_Linux + 331) #define __NR_io_pgetevents (__NR_Linux + 332)
+#ifdef __KERNEL__ +#define __NR_syscalls 332 +#endif + /* * 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 */