linux-kernel - Re: [PATCH 01/21] x86/mm/asi: Add CONFIG_MITIGATION_ADDRESS_SPACE

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Message-ID: <DDQY0TEKY4MU.2MMSAEB8QQZ4S@google.com>
Date: Fri, 24 Oct 2025 23:32:30 +0000
From: Brendan Jackman <jackmanb@...gle.com>
To: Borislav Petkov <bp@...en8.de>, Brendan Jackman <jackmanb@...gle.com>
Cc: 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@...ux.dev>
Subject: Re: [PATCH 01/21] x86/mm/asi: Add CONFIG_MITIGATION_ADDRESS_SPACE_ISOLATION

On Fri Oct 24, 2025 at 10:37 PM UTC, Borislav Petkov wrote:
> On Wed, Sep 24, 2025 at 02:59:36PM +0000, Brendan Jackman wrote:
>> This long awkward name is for consistency with
>> CONFIG_MITIGATION_PAGE_TABLE_ISOLATION.
>
> But why?
>
> I bet you someone will get confused and mean
> CONFIG_MITIGATION_PAGE_TABLE_ISOLATION when she means
> CONFIG_MITIGATION_ADDRESS_SPACE_ISOLATION or vice versa due to the
> conglomerate of similar words.
>
> Now compare that to CONFIG_ASI! Wonderfully short and clear.
>
> Especially when the namespace already is "asi_" ...
>
> The only problem with ASI is it doesn't tell you what it is but you can look
> it up with simple grepping...
>
> I'd say.

Sure, CONFIG_ASI sounds great to me, if it sounds good to you :)

And yeah if someone doesn't know what ASI is, they probably don't know
what ADDRESS_SPACE_ISOLATION is either to be honest. The Kconfig file
has a nice place to document it.