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b=YigsGhKLHAS1cw4q3uoFzwBffhZ8H3PN7g5JvVhSdCE3LGi5D4xlnJxVQ/41Qh3OJ k93K3uVnQeWymvZ9/2zXtjabw6KxidwLG7oBUPjtnQutYilyAlDA1wzlKvJj+V57v9 kgvu+7zrqTYTmma1qy1Q8ef8mryAaDvdSyrLVncX0LhdQd8L/DEvPbQR2454slyynJ b9wUUP/02ooIKyJYBv03FFsQso8c9XK99GtIjqOYEH61EmuaiWpnRDL1Rc2iuecjYK K+ZAfZxB2+z97igjuJCEppXdQ/4ubhuFHUve8CiJBcd6uBu64Za6hOm/8+jpTBxPxm Belb0pPocadGw== Message-ID: Date: Fri, 31 Jul 2026 16:13:50 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 15/26] mm/page_alloc: add support for freetypes with no freelist Content-Language: en-US To: Brendan Jackman , Borislav Petkov , Dave Hansen , Peter Zijlstra , Andrew Morton , David Hildenbrand , Mike Rapoport , Wei Xu , Johannes Weiner , Zi Yan , Lorenzo Stoakes Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, x86@kernel.org, Sumit Garg , Will Deacon , rientjes@google.com, "Kalyazin, Nikita" , patrick.roy@linux.dev, "Itazuri, Takahiro" , Andy Lutomirski , David Kaplan , Thomas Gleixner , Yosry Ahmed , Patrick Bellasi , Reiji Watanabe , Sean Christopherson References: <20260726-page_alloc-unmapped-v3-0-6f5729aa9832@google.com> <20260726-page_alloc-unmapped-v3-15-6f5729aa9832@google.com> From: "Vlastimil Babka (SUSE)" Autocrypt: addr=vbabka@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: BDC8940014 X-Stat-Signature: g7bibysiat31j4tgqyg5ptetq6wbjd6d X-HE-Tag: 1785507237-752289 X-HE-Meta: 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 gG6S9/lt 4yRKXH0PmNG3/GZz85lFTHNH2CweWoJosRvfoikuhnwgBvsYvnLQTRKnIIO7nDWjgUYi4zntGvbkqMK2cA+j3tO3dLmmUmQYTJUijufqpmu1OzxWs0I/RuuKyJFk1x7VjTmQwnmFY9PP8jUhBji3wDi4THP5jbH+S/SiWM0QeJsbBgMQp/IkY/4UH8dLQvjSm0OEUJb7NQPfEuvmNqZ+w29HvQFpShgAR60IwvDaziq8PZOIxqbTauz5++J3m6csC+68eRJ9Ojj3cmnWND5z5s/CGfvaX8tDdtuxt4Y2aSePKMqIRWYRTz2XXb91jLJ4a8Ywcco2dQQaUfmcTsT8GUVndb/Mij7/jEyD7d2/Gb2oHzf4T9a/bnhvl1BVclkrdxv2O Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/27/26 00:22, Brendan Jackman wrote: > Freetypes are currently just a wrapper for migratetypes, but in a later > patch they will gain flags. The theoretically possible space of > freetypes will thus grow, but many freetypes will not actually be used > in practice. > > To avoid bloating structures that contain arrays of freelists, mark > freetype_idx() as possibly returning -1, and add handling of this case > to code paths that will look up freelists by freetype (unless those > paths "know" that they're operating on a freetype that has a > valid freetype_idx). > > It never actually returns -1 yet, this is just introduced as a separate > patch to make review easier. > > Signed-off-by: Brendan Jackman Reviewed-by: Vlastimil Babka (SUSE)