Re: [PATCH v8] kernel, add panic_on_warn

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?