[PATCH v8] kernel, add panic_on_warn

[David Rientjes]

On Fri, 7 Nov 2014, Prarit Bhargava wrote:

> There very much is.  Consider a thread that hits a WARN() and then panics.  Then
> somewhere in the panic code the thread hits another WARN() ... and then panics
> again.  Previously this would have caused the system to "finish" panick'ing.
> Now it makes the system hang.
> 

Then we're back to square one which is what is obviously the intent of 
your patch and the comment that goes along with it: we want to clear 
panic_on_warn once and not allow multiple panic().  So why not just add 
the necessary synchronization to make sure that happens when WARN() 
happens on two cpus simultaneously?