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imf20.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b="Lc49o/Gj"; spf=pass (imf20.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1790585638; b=5SgHLrvmYr+sg8DZ/KINSJJVA3qkeEszm0LoRDhUhQ8nnk5vrSMPlPtLvgLwS4ZBazU57V L49B93VeTlG5EV/lsi0DzDqkTjgHF+YvkPN3v0lqqIciLUAFnXxsrB01tx4fNEnVNxqln1 yLlq6lIiuod6iifsjrqvVI3eYVNrIt8= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 38FD8406D7; Mon, 28 Sep 2026 08:53:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9BFC51F000FF; Mon, 28 Sep 2026 08:53:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790585637; bh=SoMUT2BwfJC5COzbHfnGci4NZdcVm+iQPUkVyhkFY0Y=; h=Date:Subject:From:To:Cc:References:In-Reply-To; b=Lc49o/GjqegLQqj0XCZDeVz5FkD9g8IF9bKFYEUjp4Y3OB81Sw7NlOmJpVplTGR6e YFgr6CsScU19Q6DXfkHkm5D3S+C7znPTicVnirUwx2eG02C13dY2Nr8/mj5mxN2ue3 BPlIybV2xEW0mqgJEyVuDpmtktYJ6wDfnObzWKEpyEQw+2hNjdkjHcZWO6hiE15GVx b6dj/Qoc0EKruxMHbjx9xilKEBDJWVStMT2koRkSebYcosSpP7WMw0vs8kPjcxRD31 Z3rpvKi8lwtcxU3s/2WjY64ryo2hB91DOfvMq6GHoAM/DVawc1gIYfuFhAs+tfCdYM UbcNStzifoHkQ== Message-ID: <4facb8d8-2ccc-4337-bdbf-3e8c03351b7e@kernel.org> Date: Mon, 28 Sep 2026 10:53:49 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/2] selftests/mm: add tests for UFFDIO_MOVE of a uffd-protected swap entry From: "David Hildenbrand (Arm)" To: Donggeun Yoo , akpm@linux-foundation.org, rppt@kernel.org Cc: peterx@redhat.com, surenb@google.com, aarcange@redhat.com, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, mhocko@suse.com, shuah@kernel.org, kirill@shutemov.name, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260926124145.2878520-1-donggeunyoo.kernel@gmail.com> <20260926124145.2878520-3-donggeunyoo.kernel@gmail.com> <4e4223f4-dfec-4e82-97fe-25ae3a3b0f73@kernel.org> Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: DD4E11C0002 X-Rspam-User: X-Stat-Signature: exwu8tpoknsnj77xe5augfjj6thrredi X-HE-Tag: 1790585637-965886 X-HE-Meta: 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 2xL4MZkP xpcjYzDIUe+JhhNc4KSCGmjEHrBBkuHsey1WXobyjlu9uCNiQ3bzs2IJoJEv+3ltI+Kya/ln21bZfU1KrYXmtQLH3DipnLyLBusKMzSrVt3ZSxuHH/MAMHAGRMIU4VdKbJ2D+vAupEncMtXxYHcKVSztMOzEFCxTmZNhvWAsunnBTxV8OP0zfAo5W4nCG8PWzeeJxvPbQApL1Bg1Yoq1/bNfWxPF/p8j8zeTyGnl8C/To0y3k168LbvVChdig2LPI6QJ/yTP9WlR+XBPEsC44txZcbkcGoHA4omizpd5QDg8k4mlBuMiCSxZNQVj55I9WpmemxSSfog62M82ZkHZrocJfHEcMCNi3XdbON6gwiGQkiJxJoWo1HLOe1izUToL11ZeKcwL/5gZcOAQJqPa3/N5hAg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/28/26 10:53, David Hildenbrand (Arm) wrote: > On 9/26/26 14:41, Donggeun Yoo wrote: >> Move a swapped-out page out of a write-protected or RWP-protected area into >> a destination registered for missing faults only, and read pagemap bit 57 >> at the destination. The destination was never protected, so the bit must >> be clear. >> >> Assisted-by: LLM >> Signed-off-by: Donggeun Yoo >> --- >> tools/testing/selftests/mm/uffd-unit-tests.c | 84 ++++++++++++++++++++ >> 1 file changed, 84 insertions(+) >> >> diff --git a/tools/testing/selftests/mm/uffd-unit-tests.c b/tools/testing/selftests/mm/uffd-unit-tests.c >> index ef9b3956bdcfd..580178630eded 100644 >> --- a/tools/testing/selftests/mm/uffd-unit-tests.c >> +++ b/tools/testing/selftests/mm/uffd-unit-tests.c >> @@ -2037,6 +2037,75 @@ static void uffd_move_pmd_split_test(uffd_global_test_opts_t *gopts, uffd_test_a >> uffd_move_pmd_handle_fault); >> } >> >> +/* >> + * Moving a swapped-out page out of a write-protected or RWP-protected area >> + * must not carry the uffd bit into a destination registered for missing >> + * faults only: such a bit is never cleared afterwards, so pagemap keeps >> + * reporting the page as uffd-tracked. >> + * >> + * Needs a swap device; skipped if MADV_PAGEOUT cannot evict the page. >> + */ >> +static void uffd_move_swap_test_common(uffd_global_test_opts_t *gopts, >> + bool rwp) >> +{ >> + unsigned long page_size = gopts->page_size; >> + struct uffdio_move move = { }; >> + int pagemap_fd; >> + >> + if (rwp) { >> + if (uffd_register_rwp(gopts->uffd, gopts->area_src, page_size)) >> + err("register src failure"); >> + } else if (uffd_register(gopts->uffd, gopts->area_src, page_size, >> + false, true, false)) { >> + err("register src failure"); >> + } > > if () Clicked sent by accident ... let me reply once more. -- Cheers, David