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b=VQvIVbRxmF2YDwIDqPeXTx24ipPzfJIMeB0O5hBUJ8mvTxPTdODBPk/0Eitv91Ttk /KCDosScXsifvMGEzcKCM36lu8iDmK1e1v4TcTnkVXUMJIW+rOByA7cfnrw9PrkN2B zNYA2+lU2qztTWKvhVx5iZabjFRof+la4PJEOwXhazDiiZSUAWK08iMZNX81RTyo5n itietPph40OPqjRmMOCvHOoLTsLlJ+d7Q4i7yBGPBvS/Cng2RYVyNENgK4O7RBPP4m 2iQ+G9+Oozq0ISVVKnQ8cxnf6JTrdTr62WA7U8TM/qtpA4dwdbv++0nEQrx1UAcZwt SCtXzNq2Qq83A== Message-ID: <2efea0a2-0c3a-40b5-9f76-dc0613725b0b@kernel.org> Date: Mon, 11 May 2026 20:01:53 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 12/22] mm: add definitions for allocating unmapped pages Content-Language: en-US To: Brendan Jackman , Borislav Petkov , Dave Hansen , Peter Zijlstra , Andrew Morton , David Hildenbrand , Wei Xu , Johannes Weiner , Zi Yan , Lorenzo Stoakes Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, x86@kernel.org, rppt@kernel.org, Sumit Garg , derkling@google.com, reijiw@google.com, Will Deacon , rientjes@google.com, patrick.roy@linux.dev, "Itazuri, Takahiro" , Andy Lutomirski , David Kaplan , Thomas Gleixner , Yosry Ahmed References: <20260320-page_alloc-unmapped-v2-0-28bf1bd54f41@google.com> <20260320-page_alloc-unmapped-v2-12-28bf1bd54f41@google.com> From: "Vlastimil Babka (SUSE)" In-Reply-To: <20260320-page_alloc-unmapped-v2-12-28bf1bd54f41@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 4F60C40019 X-Stat-Signature: uy7ymu3hfxagydpmya5q5z46ut5w55jg X-Rspam-User: X-HE-Tag: 1778522521-774780 X-HE-Meta: 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 x0N78Vx3 fKtBzGh9SI93Fd122ijh8EeUjnEoVccyaOwXFXaUqNrFNffcNc+RWBgoKmJ3RM8cD2pEppo6yblRac3/+H9mPs+lYgl493npYq1nwEwjqcTEzdEA+ULnu14SV4JJihEwQXvWOatR1Wrf5e4HClMU0o5nIT8xBHh3DtpXuavcqiXK/B5R31l1GXWJ8ZmPBcXgE5FOG5D2yxm+EQWXNJ50uQU16R8gQ5KvwMX6FvE7r3MR8xDFlnxQyAZ7j6HKizz9y0o5GjYouPl+qxU4= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/20/26 19:23, Brendan Jackman wrote: > Create __GFP_UNMAPPED, which requests pages that are not present in the > direct map. Since this feature has a cost (e.g. more freelists), it's > behind a kconfig. Unlike other conditionally-defined GFP flags, it > doesn't fall back to being 0. This prevents building code that uses > __GFP_UNMAPPED but doesn't depend on the necessary kconfig, since that > would lead to invisible security issues. > > Create a freetype flag to record that pages on the freelists with this > flag are unmapped. This is currently only needed for MIGRATE_UNMOVABLE > pages, so the freetype encoding remains trivial. > > Also create the corresponding pageblock flag to record the same thing. > > To keep patches from being too overwhelming, the actual implementation > is added separately, this is just types, Kconfig boilerplate, etc. > > Signed-off-by: Brendan Jackman Aside from the gfp vs internal flag decision, seems fine. Acked-by: Vlastimil Babka (SUSE)