NR_syscalls macro holds the number of system call exist in IA64 architecture. This macro is currently the part of asm/unistd.h file. 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 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 come up with another macro - __NR_syscalls which will be updated by the script and it will be present in uapi/asm/unistd.h. The macro name changed form NR_syscalls to __NR_syscalls 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 email@example.com --- arch/ia64/include/asm/unistd.h | 4 +--- arch/ia64/include/uapi/asm/unistd.h | 4 ++++ 2 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/arch/ia64/include/asm/unistd.h b/arch/ia64/include/asm/unistd.h index ffb705d..397b143 100644 --- a/arch/ia64/include/asm/unistd.h +++ b/arch/ia64/include/asm/unistd.h @@ -10,9 +10,7 @@
- - -#define NR_syscalls 326 /* length of syscall table */ +#define NR_syscalls __NR_syscalls /* length of syscall table */
/* * The following defines stop scripts/checksyscalls.sh from complaining about diff --git a/arch/ia64/include/uapi/asm/unistd.h b/arch/ia64/include/uapi/asm/unistd.h index 4d590c9..4186dc2 100644 --- a/arch/ia64/include/uapi/asm/unistd.h +++ b/arch/ia64/include/uapi/asm/unistd.h @@ -341,4 +341,8 @@ #define __NR_preadv2 1348 #define __NR_pwritev2 1349
+#ifdef __KERNEL__ +#define __NR_syscalls 326 +#endif + #endif /* _UAPI_ASM_IA64_UNISTD_H */