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[221.241.217.81]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-394ea9722fbsm7233622a91.3.2026.08.15.14.58.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 15 Aug 2026 14:58:39 -0700 (PDT) Date: Sun, 16 Aug 2026 06:58:36 +0900 Message-ID: From: Hajime Tazaki To: broonie@kernel.org Cc: ljs@kernel.org, linux-mm@kvack.org, geert@linux-m68k.org, daniel@thingy.jp, shuah@kernel.org, kees@kernel.org, luto@amacapital.net, wad@chromium.org, jackmanb@google.com, liuhangbin@gmail.com, rbm@suse.com, linux-kselftest@vger.kernel.org, linux-um@lists.infradead.org Subject: Re: [RFC PATCH 5/6] selftests: run tests on nommu architecture In-Reply-To: <4355a510-2e00-41f7-9bb3-8f6b2d95503b@sirena.org.uk> References: <20260813063401.1786548-1-thehajime@gmail.com> <20260813063401.1786548-6-thehajime@gmail.com> <4355a510-2e00-41f7-9bb3-8f6b2d95503b@sirena.org.uk> User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/27.2 Mule/6.0 MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260815_145842_915197_F0E8C1FC X-CRM114-Status: GOOD ( 25.99 ) X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org Hello Mark, thank you for your time to review the patch ! On Fri, 14 Aug 2026 23:34:15 +0900, Mark Brown wrote: > > [1 ] > On Fri, Aug 14, 2026 at 01:50:50PM +0100, Lorenzo Stoakes (ARM) wrote: > > > So at this point you're not really running much of the selftests at all, > > and are only happening to run those that don't do the very basic stuff > > nommu can't deal with. > > > I think an audit of existing tests to figure out what works with nommu vs > > what doesn't is really unreasonable again, given nobody tests or seemingly > > uses these arches. > > > So this patch might beget more nommu carve outs and exceptions and > > therefore nommu workload and maintenance, which isn't really sustainable. > > > I know I complain about lack of testing on nommu, but at the same time I > > don't think running arbitrary tests that happen to work on it and who knows > > if they are valid asserts anyway really fixes things. > > > And given nobody really is doing testing, it's not really a great RoI > > here... > > Perhaps a good first step here is to start off with getting some public > CI set up, then build up to getting things running cleanly. That way > there'll be visible ongoing coverage which will help motivate getting > whatever changes integrated, and if the changes are done bit by bit > there should be clearer explanations for why they make sense on nommu. thanks, I'm currently running tests on my personal CI (gh actions) but try to find a public one to be more visible to others. > You could perhaps use a skiplist to ignore tests that don't work yet so > the CI starts off clean? thanks, that would indeed make nommu tests more cleaner to integrate as a first step. -- Hajime