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[79.241.242.92]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3c6070264fbsm1198544f8f.67.2025.08.21.23.24.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 21 Aug 2025 23:24:33 -0700 (PDT) Message-ID: <7077e09f-6ce9-43ba-8f87-47a290680141@redhat.com> Date: Fri, 22 Aug 2025 08:24:31 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC 10/35] mm/hugetlb: cleanup hugetlb_folio_init_tail_vmemmap() To: =?UTF-8?Q?Mika_Penttil=C3=A4?= , linux-kernel@vger.kernel.org Cc: Alexander Potapenko , Andrew Morton , Brendan Jackman , Christoph Lameter , Dennis Zhou , Dmitry Vyukov , dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, iommu@lists.linux.dev, io-uring@vger.kernel.org, Jason Gunthorpe , Jens Axboe , Johannes Weiner , John Hubbard , kasan-dev@googlegroups.com, kvm@vger.kernel.org, "Liam R. 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 6287B4000A X-Stat-Signature: qi6opxd39wn69njrbce349p8wqg5s1kp X-Rspam-User: X-HE-Tag: 1755843878-468759 X-HE-Meta: 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 S3+FAnDj ynE2PjGRwePNDVydHFcAwfTzH7dUjjF0OiVqgAFwF8gfjQGCILE7oiaeiY90FlQGC4/0DBC+eJYmZ9E3H6Sq16VX17ClHuU7yDGTSxgSRpIrXq+bQH4rPD5nQSXfIrHQV+1/Da8Q4EP0tsq2+pIVIWB7cL2XfSX7f7cnGp3jia8XdFvqt24p+UaFWkBSb1XG7JAHVow38+QTULgzNESKGvrygZx9uERfywRp0fXBqTJS9cra8cjl+CkOfQFdC3VbCGZ80+UD9Wnd7JZZwSUIzis9SF6PoFFzSBHD8i/eDdjmWG6LB7HJw5VLfr5mvrkvdwyf2LVJT0TTj5hqMl6DStsx2BDpcRcEZ3GDxrZg3jYksgUeHI7sQh8ctjoMj+Qa6h19kPNbwhbRSg6bgPd8EZxBLONkWzssva4SyGfUchk9/vo2RbFnKpM3ZS7Gz0MF+i7oHChuKV+slS0w= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 22.08.25 06:09, Mika Penttilä wrote: > > On 8/21/25 23:06, David Hildenbrand wrote: > >> All pages were already initialized and set to PageReserved() with a >> refcount of 1 by MM init code. > > Just to be sure, how is this working with MEMBLOCK_RSRV_NOINIT, where MM is supposed not to > initialize struct pages? Excellent point, I did not know about that one. Spotting that we don't do the same for the head page made me assume that it's just a misuse of __init_single_page(). But the nasty thing is that we use memblock_reserved_mark_noinit() to only mark the tail pages ... Let me revert back to __init_single_page() and add a big fat comment why this is required. Thanks! -- Cheers David / dhildenb