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b=jSSyx/XUgzH8me+WQNiUcNtdsh5wE7pEg1D5p26XknqUIoOrz4umY52V9T8+OJeCp wBxHXhPy8IJfp0NTA4PR30iX8xEPBq50qJc3ZsxwvcBFcm3eK98t1w4myGez8zT4FJ mRfZm5qMFTBCuvU0gX72h4+ZnK1KHmFTfs4uRIibTh+5Qrzop4y7CdZD+CPCSwRW5o eUPrV1nH0YqEI0BDVlqvpu8CYpq2fdZWPl3s6l7FUdg4cv5Uj6oH9UW4+PRDTu6V0x 5ZeESauDqpj+ms090X7/idd+ykAN1fFvaQoVkAmwkhmCdW510uXxG/sU+iwe5tw1SJ 19b3qLLVde9JQ== Message-ID: <4f6d4ee8-9f2b-4da8-9456-f47cccfe4367@kernel.org> Date: Thu, 2 Apr 2026 09:28:16 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/2] selftests/mm: verify droppable mappings cannot be locked To: Anthony Yznaga , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: akpm@linux-foundation.org, ljs@kernel.org, Liam.Howlett@oracle.com, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, jannh@google.com, pfalcato@suse.de, Jason@zx2c4.com, shuah@kernel.org References: <20260402003417.438037-1-anthony.yznaga@oracle.com> <20260402003417.438037-3-anthony.yznaga@oracle.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 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 0DF66180002 X-Stat-Signature: kdrz43cwzzfrfgmh9oezko1kcm13brmy X-Rspam-User: X-HE-Tag: 1775114904-559388 X-HE-Meta: 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 eq0FsrAQ tkQw+5qEtkm9VTnauD1/JBx2I+uFjEjW9rxitNk2i6gqi7/jjdc20OnjvntIaP9AvcHA9Fhv3MBxTL2AjiSeGunIIU8tn8vyF0uaz7v83fQJG3W8QmLrg8gtorNt3aPPDTqLMfBr2K/DSH+SuHZB8wbh1xrJgsbp/FlR5okMFXta3nZ6nrW9ZfGno6VfaWTJKyKvE0KiaaOZug7RcjPrrHf9l2yvWqDLxbJNQTp3bQxuUIZL+B3TUxLaVzpXml/M2yvK3 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: > + > +/* > + * Droppable memory should not be lockable. > + */ > +static void test_mlock_droppable(void) > +{ > + char *map; > + unsigned long page_size = getpagesize(); > + > + /* > + * Ensure MCL_FUTURE is not set. > + */ > + if (mlockall(MCL_CURRENT)) > + ksft_exit_fail_msg("mlockall(MCL_CURRENT): %s\n", strerror(errno)); Why do we need the prior mlockall()? If that is really required, the comment should be clearer why the munlockall() is insufficient. Also, why can't we fail only the test? > + if (munlockall()) > + ksft_exit_fail_msg("munlockall() %s\n", strerror(errno)); Why can't we fail only the test? > + > + map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE, > + MAP_ANONYMOUS | MAP_DROPPABLE, -1, 0); > + if (map == MAP_FAILED) { > + if (errno == EOPNOTSUPP) { > + ksft_test_result_skip("%s: MAP_DROPPABLE not supported\n", __func__); > + return; > + } > + ksft_exit_fail_msg("mmap error: %s\n", strerror(errno)); same. > + } > + > + if (mlock2_(map, 2 * page_size, 0)) { > + munmap(map, 2 * page_size); Not required when exiting either way? > + ksft_exit_fail_msg("mlock2(0): %s\n", strerror(errno)); > + } > + > + ksft_test_result(!unlock_lock_check(map, false), "%s: droppable memory not locked\n", > + __func__); > + > + munmap(map, 2 * page_size); > +} > + > +static void test_mlockall_future_droppable(void) > +{ > + char *map; > + unsigned long page_size = getpagesize(); > + > + if (mlockall(MCL_CURRENT | MCL_FUTURE)) > + ksft_exit_fail_msg("mlockall(MCL_CURRENT | MCL_FUTURE): %s\n", strerror(errno)); Similar comments as for the other path regarding ksft_exit_fail_msg() etc. > + > + map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE, > + MAP_ANONYMOUS | MAP_DROPPABLE, -1, 0); > + > + if (map == MAP_FAILED) { > + if (errno == EOPNOTSUPP) { > + ksft_test_result_skip("%s: MAP_DROPPABLE not supported\n", __func__); > + return; > + } > + ksft_exit_fail_msg("mmap error: %s\n", strerror(errno)); > + } > + > + ksft_test_result(!unlock_lock_check(map, false), "%s: droppable memory not locked\n", > + __func__); > + > + if (munlockall()) { > + munmap(map, 2 * page_size); > + ksft_exit_fail_msg("munlockall() %s\n", strerror(errno)); > + } > + > munmap(map, 2 * page_size); > } -- Cheers, David