linux-kernel - Re: [RFC PATCH 7/7] tools: add skeleton code for userland testing of VMA logic

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Message-ID: <202406270957.C0E5E8057@keescook>
Date: Thu, 27 Jun 2024 09:58:08 -0700
From: Kees Cook <kees@...nel.org>
To: Lorenzo Stoakes <lstoakes@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, "Liam R . Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Matthew Wilcox <willy@...radead.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
	Eric Biederman <ebiederm@...ssion.com>,
	Suren Baghdasaryan <surenb@...gle.com>
Subject: Re: [RFC PATCH 7/7] tools: add skeleton code for userland testing of
 VMA logic

On Thu, Jun 27, 2024 at 11:39:32AM +0100, Lorenzo Stoakes wrote:
> Establish a new userland VMA unit testing implementation under
> tools/testing which utilises existing logic providing maple tree support in
> userland utilising the now-shared code previously exclusive to radix tree
> testing.
> 
> This provides fundamental VMA operations whose API is defined in mm/vma.h,
> while stubbing out superfluous functionality.
> 
> This exists as a proof-of-concept, with the test implementation functional
> and sufficient to allow userland compilation of vma.c, but containing only
> cursory tests to demonstrate basic functionality.

Interesting! Why do you want to have this in userspace instead of just
wiring up what you have here to KUnit so testing can be performed by
existing CI systems that are running all the KUnit tests?

-Kees

-- 
Kees Cook