__NR_syscalls macro holds the number of system call exist in this architecture. This macro is currently the part of asm/unistd.h file. We have 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 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. For that, I moved the __NR_syscalls macro from asm/unistd.h to uapi/asm/unistd.h. 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/microblaze/include/asm/unistd.h | 2 -- arch/microblaze/include/uapi/asm/unistd.h | 4 ++++ 2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/microblaze/include/asm/unistd.h b/arch/microblaze/include/asm/unistd.h index a62d094..e19550f 100644 --- a/arch/microblaze/include/asm/unistd.h +++ b/arch/microblaze/include/asm/unistd.h @@ -38,6 +38,4 @@
#endif /* __ASSEMBLY__ */
-#define __NR_syscalls 401 - #endif /* _ASM_MICROBLAZE_UNISTD_H */ diff --git a/arch/microblaze/include/uapi/asm/unistd.h b/arch/microblaze/include/uapi/asm/unistd.h index 7a9f16a..ed9c6f5 100644 --- a/arch/microblaze/include/uapi/asm/unistd.h +++ b/arch/microblaze/include/uapi/asm/unistd.h @@ -418,4 +418,8 @@ #define __NR_io_pgetevents 399 #define __NR_rseq 400
+#ifdef __KERNEL__ +#define __NR_syscalls 401 +#endif + #endif /* _UAPI_ASM_MICROBLAZE_UNISTD_H */