Re: [PATCH] tracing: Add WARN_ON_ONCE for syscall_nr check

[Tao Chen <chen.dylane@gmail.com>]

在 2024/11/28 20:46, Steven Rostedt 写道:
> On Thu, 28 Nov 2024 19:53:19 +0800
> Tao Chen <chen.dylane@gmail.com> wrote:
> 
>> Now, x86_64 kernel not support to trace syscall for ia32 syscall.
>> As a result, there is no any trace output when tracing a ia32 task.
>> Like unreg_event_syscall_enter, add a WARN_ON_ONCE judgment for
>> syscall_nr in perf_syscall_enter and ftrace_syscall_enter to give
>> some message.
> 
> So on a system that has "panic_on_warn" set and they trace a 32 bit
> system call, it will cause their system to crash. Is that the intended
> behavior?
> 
> WARN*() is for self testing the kernel to detect real bugs, not to
> inform users that something isn't supported.
> 
> BIG NAK!
> 
> -- Steve

Hi, Steve, thank you for your reply, as you say, so what about 
pr_warn_once api just to print something ?

-- 
Best Regards
Dylane Chen