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[2003:d8:2f44:3e00:9fca:7d89:a265:56f3]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45a1c6cfed5sm19815875e9.7.2025.08.14.05.59.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 14 Aug 2025 05:59:14 -0700 (PDT) Message-ID: <1387eeb8-fc61-4894-b12f-6cae3ad920bd@redhat.com> Date: Thu, 14 Aug 2025 14:59:13 +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 7/7] selftests: prctl: introduce tests for disabling THPs except for madvise To: Mark Brown Cc: Lorenzo Stoakes , Usama Arif , Andrew Morton , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, corbet@lwn.net, rppt@kernel.org, surenb@google.com, mhocko@suse.com, hannes@cmpxchg.org, baohua@kernel.org, shakeel.butt@linux.dev, riel@surriel.com, ziy@nvidia.com, laoar.shao@gmail.com, dev.jain@arm.com, baolin.wang@linux.alibaba.com, npache@redhat.com, Liam.Howlett@oracle.com, ryan.roberts@arm.com, vbabka@suse.cz, jannh@google.com, Arnd Bergmann , sj@kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kernel-team@meta.com References: <20250813135642.1986480-1-usamaarif642@gmail.com> <20250813135642.1986480-8-usamaarif642@gmail.com> <13220ee2-d767-4133-9ef8-780fa165bbeb@lucifer.local> <5b341172-5082-4df4-8264-e38a01f7c7d7@lucifer.local> <0b7543dd-4621-432c-9185-874963e8a6af@redhat.com> <5dce29cc-3fad-416f-844d-d40c9a089a5f@lucifer.local> <47e98636-aace-4a42-b6a4-3c63880f394b@sirena.org.uk> From: David Hildenbrand Content-Language: en-US Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 14.08.25 14:09, Mark Brown wrote: > On Thu, Aug 14, 2025 at 02:00:27PM +0200, David Hildenbrand wrote: > >> Some people (hello :) ) run tests against distro kernels ... shame that >> prctl just knows one sort of "EINVAL" so we cannot distinguish :( > >> But yeah, maybe one has to be more careful of filtering these failures out >> then. > > Perhaps this is something that needs considering in the ABI, so > userspace can reasonably figure out if it failed to configure whatever > is being configured due to a missing feature (in which case it should > fall back to not using that feature somehow) or due to it messing > something else up? We might be happy with the tests being version > specific but general userspace should be able to be a bit more robust. Yeah, the whole prctl() ship has sailed, unfortunately :( -- Cheers David / dhildenb