Re: [PATCH 1/5] x86/mm/pat: introcude cpa_lock() and cpa_unlock()

[Dave Hansen]

On 7/28/26 07:21, Peter Zijlstra wrote:
> There was already a patch merged that removed the shole debug_pagealloc
> exception. Is that not better?

As I'm scanning through email this morning, there's another issue that
popped up with that patch. It's causing hangs on boot.

It's looking like debug pagealloc not taking the lock is actually
functional, not an optimization. Although, I hesitate to say
"functional" and would prefer to use much less nice words to describe it.