Re: [PATCH] xen/page_alloc: Simplify domain_adjust_tot_pages

["Alejandro Vallejo" <alejandro.vallejo@xxxxxxxxx>]

On Wed Mar 5, 2025 at 1:39 PM GMT, Jan Beulich wrote:
> > It's all quite perverse. Fortunately, looking at adjacent claims-related 
> > code
> > xl seems to default to making a claim prior to populating the physmap and
> > cancelling the claim at the end of the meminit() hook so this is never a 
> > real
> > problem.
> > 
> > This tells me that the logic intent is to force early failure of
> > populate_physmap and nothing else. It's never active by the time ballooning 
> > or
> > memory exchange matter at all.
>
> Ah yes, this I find more convincing. (Oddly enough this is all x86-only code.)

Should I take this as an "ack" to the general plan of early returning on pages
<=0? I have a series pending that relies on it (the v2 of this[1]). And would
rather defer its sending until this one get some form of nod. Otherwise I'll
integrate it in the other series so I can at least reduce remove dependencies
between things in-flight.

Cheers,
Alejandro

[1] 
https://lore.kernel.org/xen-devel/20250304111000.9252-1-alejandro.vallejo@xxxxxxxxx/