linux-kernel - Re: [PATCH 05/21] x86/mm/pat: mirror direct map changes to ASI

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Message-ID: <20260120163728.GDaW-vSLGY1P_E0DqS@fat_crate.local>
Date: Tue, 20 Jan 2026 17:37:28 +0100
From: Borislav Petkov <bp@...en8.de>
To: Brendan Jackman <jackmanb@...gle.com>
Cc: Dave Hansen <dave.hansen@...el.com>, Andy Lutomirski <luto@...nel.org>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...e.com>,
	Johannes Weiner <hannes@...xchg.org>, Zi Yan <ziy@...dia.com>,
	Axel Rasmussen <axelrasmussen@...gle.com>,
	Yuanchu Xie <yuanchu@...gle.com>,
	Roman Gushchin <roman.gushchin@...ux.dev>, peterz@...radead.org,
	dave.hansen@...ux.intel.com, mingo@...hat.com, tglx@...utronix.de,
	akpm@...ux-foundation.org, david@...hat.com, derkling@...gle.com,
	junaids@...gle.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, reijiw@...gle.com, rientjes@...gle.com,
	rppt@...nel.org, vbabka@...e.cz, x86@...nel.org,
	Yosry Ahmed <yosry.ahmed@...ux.dev>
Subject: Re: [PATCH 05/21] x86/mm/pat: mirror direct map changes to ASI

On Thu, Oct 02, 2025 at 05:08:59PM +0000, Brendan Jackman wrote:
> OK, then it probably just sounds wrong to me because I'm steeped in the
> current jargon. For v2 I'll try just dropping "[un]restricted".

So AFAIU, we have two address spaces - the full one - which has *everything*
mapped in and the limited one, with things removed from it. Right?

So calling the unrestricted "the full address space" makes sense to me. I.e.,
it has *everything* in it.

And then there's the subset of the full address space which has holes in it.
Looking at Merriam Webster, it suggests those antonyms to "complete":

partial, incomplete, reduced, abbreviated, diminished.

Yahaa, they all make sense.

"partial address space" sounds good to me. "Reduced" even better. So having
the full and the reduced address space would make the nomenclature very easy,
IMO. 

Thoughts?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette