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| author | Firoz Khan <firoz.khan@linaro.org> | 2018-11-13 11:19:28 +0100 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2018-12-03 08:45:21 +0100 |
| commit | a86067f587a9460e5f004469d183a76d3a2ab068 (patch) | |
| tree | b854656260d9d46bc292e15fd2ce826b68e0f6a2 /arch/xtensa/kernel/entry.S | |
| parent | Linux 4.20-rc5 (diff) | |
| download | linux-a86067f587a9460e5f004469d183a76d3a2ab068.tar.xz linux-a86067f587a9460e5f004469d183a76d3a2ab068.zip | |
xtensa: add __NR_syscalls along with __NR_syscall_count
__NR_syscall_count macro holds the number of system call
exist in xtensa architecture. We have to change the value
of __NR_syscall_count, 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-
_syscall_count value.
1. Update __NR_syscall_count in asm/unistd.h manually by
counting the no.of system calls. No need to update __NR-
_syscall_count 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_syscall_count 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.
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: Max Filippov <jcmvbkbc@gmail.com>
[Max: Drop __NR_syscall_count completely, use __NR_syscalls instead]
Diffstat (limited to 'arch/xtensa/kernel/entry.S')
| -rw-r--r-- | arch/xtensa/kernel/entry.S | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S index 9cbc380e9572..b0007567e497 100644 --- a/arch/xtensa/kernel/entry.S +++ b/arch/xtensa/kernel/entry.S @@ -1874,7 +1874,7 @@ ENTRY(system_call) /* syscall = sys_call_table[syscall_nr] */ movi a4, sys_call_table - movi a5, __NR_syscall_count + movi a5, __NR_syscalls movi a6, -ENOSYS bgeu a3, a5, 1f |