Re: Removing Mandatory Locks

[Steven Rostedt]

On Thu, 19 Aug 2021 15:32:31 -0700
Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:

> I originally thought WARN_ON_ONCE() just to get the distro automatic
> error handling involved, but it would probably be a big problem for
> the people who end up having panic-on-warn or something.
> 
> So probably just a "make it a big box" thing that stands out, kind of
> what lockdep etc does with
> 
>         pr_warn("======...====\n");
> 
> around the messages..
> 
> I don't know if distros have some pattern we could use that would end
> up being something that gets reported to the user?

People have started using my trace-printk notice message, that seems to
be big enough to get noticed.


 **********************************************************
 **   NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE   **
 **                                                      **
 ** trace_printk() being used. Allocating extra memory.  **
 **                                                      **
 ** This means that this is a DEBUG kernel and it is     **
 ** unsafe for production use.                           **
 **                                                      **
 ** If you see this message and you are not debugging    **
 ** the kernel, report this immediately to your vendor!  **
 **                                                      **
 **   NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE   **
 **********************************************************

There's been some talk about making that a more "generic" warning
message too.

-- Steve