Re: [RFC V2 3/3] mm: Replace pgtable entry prints with new format

[Hugh Dickins]

On Fri, 12 Jun 2026, David Hildenbrand (Arm) wrote:
...
> 
> After some off-list discussion, I wonder if we can make our life easier.
> 
> I think, even with your patch, there is still the case:
> 
> pr_alert("BUG: Bad page map in process %s  %s:%08llx", current->comm,
> 	 pgtable_level_to_str(level), entry);
> 
> Where we cast all entries to an "unsigned long" in the callers. We'd have to rework all
> that for 128bit entries either way (passing them in some struct instead).
> 
> I really just extended what we used to do here in print_bad_pte() before commit ec63a44011d.
> 
> Maybe we should just drop the "print the involved page table entries" thing?
> 
> I mean, we do have the actual page, and we do have the address in the address space, which
> we all print.
> 
> Not sure if the actual page table entries are that relevant?

The page table entry is BUGgily Bad: we want to see what it looks like
(sometimes, a sequence of bad page map entries may even show up as ASCII).

Hugh