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Howlett" , Vlastimil Babka , Harry Yoo , Jann Horn , linux-mm@kvack.org Subject: Re: [PATCH 2/2] migrate: Replace RMP_ flags with TTU_ flags Message-ID: References: <20260109041345.3863089-1-willy@infradead.org> <20260109041345.3863089-3-willy@infradead.org> <4b5b29ec-0629-4141-8022-8304e990bc64@lucifer.local> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4b5b29ec-0629-4141-8022-8304e990bc64@lucifer.local> X-Rspamd-Queue-Id: 95762140011 X-Stat-Signature: ushq1sdwyu3mfxzpmzdagw9ujs78kny8 X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1767970111-231726 X-HE-Meta: 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 2u9jxsb+ 0v4vcR7LMTrIB9URqDbnB17oA6oLzLBFGjBYcTt/f0pwhMhhNAMa6+3KoEzNAV3D1X95D+pb//87l/VPIROj13Q0QuG2OxFEs3qJ/wiXyPC/Hy2jdgQXk8QeMmOHGQqmmTJbwUrIs+2n3yLr/a3URtQWghYlJ8KEhAxWJgJSkU/+pY162S/YudxFtMHsknY6M7YdocZCUYeNJLAcmZLMPUx3KEWhPHMpuQsbl+5xecOoRHYbka8pIP2eyPQBjWHC1BO2FdZXO8Wke1Mn61ULQAeIaEvPUKKBUY6vu3rhospuYcEYTZiyXG9/eFKWd8vHbD2GjZ1AtCkIuaBaebT8noLGp2DiG6R3FIfsv 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 Fri, Jan 09, 2026 at 02:44:20PM +0000, Lorenzo Stoakes wrote: > > enum ttu_flags { > > + TTU_USE_SHARED_ZEROPAGE = 0x2, /* for unused pages of large folios */ > > Kinda weird we had 0x2 free :) I wonder why? Did we have flags here we removed I > guess? a98a2f0c8ce1 - TTU_MIGRATION = 0x1, /* migration mode */ cd62734ca60d - TTU_MUNLOCK = 0x2, /* munlock mode */ 732ed55823fc + TTU_SYNC = 0x10, /* avoid racy checks with PVMW_SYNC */ 013339df116c - TTU_IGNORE_ACCESS = 0x10, /* don't age */ a128ca71fb29 did many changes all at once and I shan't attempt to summarise