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| author |   Firoz Khan <firoz.khan@linaro.org> | 2018-11-13 15:49:28 +0530 |
|---|---|---|
| committer |   Max Filippov <jcmvbkbc@gmail.com> | 2018-12-02 23:45:21 -0800 |
| commit | a86067f587a9460e5f004469d183a76d3a2ab068 (patch) | |
| tree | b854656260d9d46bc292e15fd2ce826b68e0f6a2 /arch/xtensa | |
| parent | Linux 4.20-rc5 (diff) | |
| download | linux-dev-a86067f587a9460e5f004469d183a76d3a2ab068.tar.xz linux-dev-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')
| -rw-r--r-- | arch/xtensa/include/uapi/asm/unistd.h | 4 | ||||
| -rw-r--r-- | arch/xtensa/kernel/entry.S | 2 | ||||
| -rw-r--r-- | arch/xtensa/kernel/syscall.c | 4 |
3 files changed, 6 insertions, 4 deletions
diff --git a/arch/xtensa/include/uapi/asm/unistd.h b/arch/xtensa/include/uapi/asm/unistd.h index bc3f62db5c5f..332d67a6f76c 100644 --- a/arch/xtensa/include/uapi/asm/unistd.h +++ b/arch/xtensa/include/uapi/asm/unistd.h @@ -778,7 +778,9 @@ __SYSCALL(350, sys_pkey_free, 1) #define __NR_statx 351 __SYSCALL(351, sys_statx, 5) -#define __NR_syscall_count 352 +#ifdef __KERNEL__ +#define __NR_syscalls 352 +#endif /* * sysxtensa syscall handler 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 diff --git a/arch/xtensa/kernel/syscall.c b/arch/xtensa/kernel/syscall.c index 8201748da05b..8b417c9957c7 100644 --- a/arch/xtensa/kernel/syscall.c +++ b/arch/xtensa/kernel/syscall.c @@ -30,8 +30,8 @@ typedef void (*syscall_t)(void); -syscall_t sys_call_table[__NR_syscall_count] /* FIXME __cacheline_aligned */= { - [0 ... __NR_syscall_count - 1] = (syscall_t)&sys_ni_syscall, +syscall_t sys_call_table[__NR_syscalls] /* FIXME __cacheline_aligned */= { + [0 ... __NR_syscalls - 1] = (syscall_t)&sys_ni_syscall, #define __SYSCALL(nr,symbol,nargs) [ nr ] = (syscall_t)symbol, #include <uapi/asm/unistd.h> |