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[2003:d8:2f11:2400:5d0a:b6ec:2ac0:666f]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45a1a5212b2sm8133575e9.16.2025.08.13.09.24.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 13 Aug 2025 09:24:12 -0700 (PDT) Message-ID: Date: Wed, 13 Aug 2025 18:24:11 +0200 Precedence: bulk X-Mailing-List: linux-kernel@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: Lorenzo Stoakes , Usama Arif Cc: 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> 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 >> + >> +FIXTURE_SETUP(prctl_thp_disable_except_madvise) >> +{ >> + if (!thp_available()) >> + SKIP(return, "Transparent Hugepages not available\n"); >> + >> + self->pmdsize = read_pmd_pagesize(); >> + if (!self->pmdsize) >> + SKIP(return, "Unable to read PMD size\n"); >> + >> + if (prctl(PR_SET_THP_DISABLE, 1, PR_THP_DISABLE_EXCEPT_ADVISED, NULL, NULL)) >> + SKIP(return, "Unable to set PR_THP_DISABLE_EXCEPT_ADVISED\n"); > > This should be a test fail I think, as the only ways this could fail are > invalid flags, or failure to obtain an mmap write lock. Running a kernel that does not support it? We could check the errno to distinguish I guess. -- Cheers, David / dhildenb