diff options
| author | Firoz Khan <firoz.khan@linaro.org> | 2018-11-13 12:31:51 +0300 |
|---|---|---|
| committer | Matt Turner <mattst88@gmail.com> | 2018-12-21 19:57:56 +0300 |
| commit | b67bfd298f4c7ab3762aebb354a0b16635c82211 (patch) | |
| tree | d68e5ee2e452b5c8039c180352880ca010ecbb23 /arch/alpha | |
| parent | d8bf616be5f05b955d3ee32ad92d4cdb87e30349 (diff) | |
| download | linux-b67bfd298f4c7ab3762aebb354a0b16635c82211.tar.xz | |
alpha: add __NR_syscalls along with NR_SYSCALLS
NR_SYSCALLS macro holds the number of system call exist
in alpha 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_SY-
CALLS value.
1. Update NR_SYSCALLS in asm/unistd.h manually by count-
ing the no.of system calls. No need to update NR_SYS-
CALLS 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_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 implementation. We also need to enclose
this macro with #ifdef __KERNEL__ to avoid side effects.
Signed-off-by: Firoz Khan <firoz.khan@linaro.org>
Signed-off-by: Matt Turner <mattst88@gmail.com>
Diffstat (limited to 'arch/alpha')
| -rw-r--r-- | arch/alpha/include/asm/unistd.h | 2 | ||||
| -rw-r--r-- | arch/alpha/include/uapi/asm/unistd.h | 4 |
2 files changed, 5 insertions, 1 deletions
diff --git a/arch/alpha/include/asm/unistd.h b/arch/alpha/include/asm/unistd.h index 4f0ceb336e23..21b706a5b772 100644 --- a/arch/alpha/include/asm/unistd.h +++ b/arch/alpha/include/asm/unistd.h @@ -4,7 +4,7 @@ #include <uapi/asm/unistd.h> -#define NR_SYSCALLS 523 +#define NR_SYSCALLS __NR_syscalls #define __ARCH_WANT_NEW_STAT #define __ARCH_WANT_OLD_READDIR diff --git a/arch/alpha/include/uapi/asm/unistd.h b/arch/alpha/include/uapi/asm/unistd.h index 47c65f199ec7..ab40aa6c4898 100644 --- a/arch/alpha/include/uapi/asm/unistd.h +++ b/arch/alpha/include/uapi/asm/unistd.h @@ -465,4 +465,8 @@ #define __NR_pwritev2 521 #define __NR_statx 522 +#ifdef __KERNEL__ +#define __NR_syscalls 523 +#endif + #endif /* _UAPI_ALPHA_UNISTD_H */ |