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b=NHjCcWDpZe59HM++m7X4aNR69YVOC1Z+RtPkRp+i94WQaXfwcRi7zXYuU8hc8WbyO LZFtc+fCpBArY8l/DeUW6tBGsZcCCO5+7DoDMAfG+wYavc47bWqAmedj3vhYc4jewU Wk3jCMNtdDsvX5FY7E3ki2Ya8NzgHs1KH+ykl0dpROlMayIZx/vWk8RV/D0FApB3BG 0WdC9PCKTwgLuKFMOa4psJWR39shP0te6x673fzoJS/aUQFx0Be4EE3rJmsneIs1bJ /Er4O0DPZC6odkW+Es/edHvjScV3Yd6S+c6YuWM3OgU8RYYuYTCacj/kqCcWgkFGfm k2Uww+ro0suEg== Message-ID: <244ce64d-b7df-4a76-bcf9-effb0c53073d@kernel.org> Date: Mon, 21 Sep 2026 12:28:47 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 2/2] selftests/mm: Test per-open gup_test pin ownership To: Richard Cheng , akpm@linux-foundation.org Cc: jgg@ziepe.ca, jhubbard@nvidia.com, peterx@redhat.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, shuah@kernel.org, linux-kselftest@vger.kernel.org, kobak@nvidia.com, kaihengf@nvidia.com, newtonl@nvidia.com, kristinc@nvidia.com References: <20260921094243.64698-1-icheng@nvidia.com> <20260921094243.64698-3-icheng@nvidia.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: rspam02 X-Rspamd-Queue-Id: EB475A0002 X-Stat-Signature: wgferzacastpwu5opmjoikmnhmdhkwzi X-Rspam-User: X-HE-Tag: 1789986536-919119 X-HE-Meta: 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 nHwRsTvk 9iIA7Qxaud2miPfyzuwW/okIYT3+iabsV7h0QZrAFC0vsoAK6sLDnMvV3bz6cF350zPW998ImWLaO3tnxhaskRpazbiWkD/2AIQ+s8wRiO8ZfnNhjH3WNbIBrN6hkyzSYzeiupEFGJcswA/3mdk7WBRK3cyjGCzWwkzf9VEIPtnYYLOPFVHm9ouFb3X5tB4TUeB4/7TDE5cQnAgK0AiWhZfxAUOsid47T7RkbXsdpemEO+F6ZOYbGY5WvyZPEQSTAAZd6xVA8uXIKwo+qBVLvqGnh2Jq3CGfJcrJ3pAm0R1QofpN2/jBqY3uzTFUg1uqS1B2bJxZqCPh7+mc= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/21/26 11:42, Richard Cheng wrote: > Long-term pin state should be isolated between independently opened > gup_test file descriptions, while descriptors created with dup() should > continue to share the state associated with their struct file. > > Add tests using 2 independently opened gup_test descriptors. Verify that > stopping or closing the second descriptor doesn't disturb the first > descriptor's pin, that another START on the same descriptor fails with > EINVAL, and that READ fails with EINVAL after STOP. > > Close the descriptor used by the existing test matrix before running the > ownership tests. Record whether gup_test was initially available so that > a later open failure is reported as a failure instead of being hidden as > a skip. > > Also exercise the shared-file-description case: start a pin through the > original descriptor, verify that START through a duplicate fails with > EINVAL, close the original descriptor, and use the duplicate to READ and > STOP the pin > > Reviewed-by: Koba Ko > Signed-off-by: Richard Cheng > --- > tools/testing/selftests/mm/gup_longterm.c | 258 +++++++++++++++++++++- > 1 file changed, 256 insertions(+), 2 deletions(-) Sorry, we won't be adding tests for gup_test interface functionality. This is a testing interface. (I'd be quite surprised if no LLM was inovolved in writing this patch :) ) -- Cheers, David