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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776586351; bh=ig7jvjkZ1QbRCAw8nCdys/c48+Ls8Xu4gg+weYKcuIk=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=KF9lgz0LZGMXEnJIcgltyWgzbLX4A9odPYqujzVbciAfTyZweVjXlmVQRV8J8VjFk jJW6B2mIlb/YrSeo0eKYKQFebKATSh2h0GOvPyuXrsXeKaimXRwqLJaU9CTP0EFequ Gw8/FEHQrxkPQGI7mu/4Q+fC8q0LgYcYer2WrSC/r9l7hL5hRLXWY8N4obXN234T+7 vJGo0jBx61PAjWJx8mSFMAmDm5AwlKHMG5CZ2TcenCoC4wTX5ZQaTZneEpwhtTn650 XLM50Nw/DYke8Gu6z1yFfF2Tq0CVB+r4F2sXSfXRDybq1qLjtVLkenndZoTpYI21Cn eiHE5fpKT5bMA== Message-ID: Date: Sun, 19 Apr 2026 10:12:25 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/migrate_device: Cleanup up PMD Checks and warnings To: Sunny Patel Cc: akpm@linux-foundation.org, apopple@nvidia.com, byungchul@sk.com, gourry@gourry.net, joshua.hahnjy@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, matthew.brost@intel.com, rakie.kim@sk.com, sj@kernel.org, ying.huang@linux.alibaba.com, ziy@nvidia.com References: <82193ab8-e6f6-4664-8b4f-e30d280d8b1c@kernel.org> <20260418171806.11615-1-nueralspacetech@gmail.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: B2D1640007 X-Rspamd-Server: rspam12 X-Stat-Signature: ugnehawfz8strwuf86ku4h7s1eajbsgn X-Rspam-User: X-HE-Tag: 1776586352-595919 X-HE-Meta: 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 dBIigj/K aRAAbcCR6jLT2e3nwG5ucEqAH+b8WiA4oOUmTuQdT6getTVRP7R5gcXtgqxBoEAQAxPKSJrgsPn/RZMU/oaKrhZz9kUvMNTqrYhvwZzfj4yCEfzp5NFhGy+O4iReDQBNBl6mprfTCpO8Ci5Ubm64Ptg6hhsTkd2zN1qPPT8oMeKP4gTKWsdsgQ30/toI8MD/dyYN/VjHmQONr86bRQKjNcmDkm8YpzMJpYiMW5ZStkPfDRJABHvGhVeZXAOPw03o9Dnp9GC5oh/x5QCRqoM6tm2tzq3dou33pQwxAWdmhy8nXpOWE7G/28bQrNlC2BeQyE4rSXJgvtT2A2NAlVo8f5TgV+lla9/9kOL8cp9+mcFiBuX8FhUJG9xmf+E+SfzI3v7Qu2i7CL1MkaJsbETd/n1hFOQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4/18/26 19:18, Sunny Patel wrote: > On 4/17/26 01:52, SeongJae Park wrote: >> On Thu, 16 Apr 2026 21:44:15 +0200 "David Hildenbrand (Arm)" wrote: >> >> [...] >>> >>> is_huge_zero_pmd() checks pmd_present(), so we didn't have a bug before. >>> >>> We could also do: >>> >>> if (is_huge_zero_pmd(*pmdp)) { >>> flush = true; >>> } else if (!pmd_none(*pmdp)) { >>> goto unlock_abort; >>> } >> >> Then we could even further remove the braces and reduce one more line, nice! > > is_huge_zero_pmd() didn't check for pmd_present as of now as per the current implementation of it so additional check require for pmd_present(). I don't know what you mean. Here is the code in the tree: static inline bool is_huge_zero_pmd(pmd_t pmd) { return pmd_present(pmd) && is_huge_zero_pfn(pmd_pfn(pmd)); } -- Cheers, David