From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 794DF37C900; Thu, 1 Oct 2026 07:08:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790838524; cv=none; b=kRqjOUL4LcaNBlKqWLFNalnIvJqP1ru19jm7so/+WA+Xbz3C2bc7+3Cw9h2zXL4mhsvPWi357TrgqtoWkKk/xeRok85HE0wwsDrpqCU2UVx1t1Qy+6s6uaXFuKYkzh/hdwKnJiHlwlZnIxxkKEesG84WdKadbA8dVnl6+Uxn9xM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790838524; c=relaxed/simple; bh=223qejtntGPNSAVFviI/+OzcjaTm/9uheZooSnKb87U=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=VRHLWqZPs5FFWeeAfvDK5gh6f5Jbqlgy+81ov1IrKkBMayv/ZqKP8Epw67hy0b2zIT3wxmBtVMxO2mlrE4YNuIg2rczMTxPbaW6OesTgAng7jX8/DFQZZPkRlgtno3OFYppCKM5mV3TbgdkcivF0+v0hi/ov3+JcjfXmUy3TW0Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Wuzhray8; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Wuzhray8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 299501F000FF; Thu, 1 Oct 2026 07:08:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790838523; bh=FvSYXYalm63CDGUp0iUMo4KFN4PdB/yvny+LMXqSogI=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=Wuzhray8wlCI4wK6CdYNATgeXQk1B1+6oDPjXFB6wgag6e8Zyayeenn0GpvbleIN6 B9WaFzIZYilGEIPzM/fGe96QLu3nOblllzyhAslnrLWKR1kKbm9zArBR+ZI9Uq7evp f3grQzKvpQOqytiQ1J1wxObVg0HL4fxsheS86h8oZHU74sJLvOqgA1czZSBjeryb0K wYDPXcy+jDX9rjw0WDm7FOYEyxhOUdfAVX+aNDl5+PCNmL+eUzqR7LLvaO4FDlxcR7 0fGkKvwEi7wQyYZb83GPZcRmYJ8aSa2TA0A3PU1BBnjQfUk2tibb4v1VNn+c2A4ER+ os8O7YULYHA/w== Message-ID: Date: Thu, 1 Oct 2026 09:08:33 +0200 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 1/2] selftests: run tests on nommu architecture To: Hajime Tazaki , linux-mm@kvack.org, liam@infradead.org, rbm@suse.com, akpm@linux-foundation.org, luto@amacapital.net, brendan.jackman@linux.dev, liuhangbin@gmail.com, corbet@lwn.net, kees@kernel.org, ljs@kernel.org, broonie@kernel.org, mhocko@suse.com, rppt@kernel.org, shuah@kernel.org, surenb@google.com, vbabka@kernel.org, wad@chromium.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-um@lists.infradead.org Cc: geert@linux-m68k.org, daniel@thingy.jp References: <20260929235711.2287931-1-thehajime@gmail.com> <20260929235711.2287931-2-thehajime@gmail.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 9/30/26 01:57, Hajime Tazaki wrote: > Architectures lacking MMU don't support fork(2) syscall and only > vfork(2) is available with limitations. Thus, we cannot run kselftest > on nommu architecture as is. > > This commit addresses this issue with the following changes: > > - on test run stage, avoid calling timeout command when NOMMU=1 variable > added to environmental variable, since timeout command uses fork > syscall which nommu platform doesn't support. > - describe the difference of nommu tests in the document. > > So command line to build/execute tests for nommu should be like below: > > $ make ARCH=um NOMMU=1 O=build kselftest-all TARGETS=nommu > $ make ARCH=um NOMMU=1 O=build kselftest-install TARGETS=nommu > $ NOMMU=1 ./build/kselftest/kselftest_install/run_kselftest.sh -p \ > -c nommu Is there a way we could derive that from the environment in one of these cases? I'd assume once could compile and run the nommu um variant, and within there simply build the selftests and run them? -- Cheers, David