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b=ajJF1xjEckAWgdOWlX6Dz4ySD45UoXxyjeF5lP4rl6nLBlrqwZLhbSLSxcSzy0Njd VwUrnri1baFETwpo7+m/vErAL4bym1yL0f/izF0AFVisuTtNWikCdhA2fWaVadZyty N5SaN1RpOrSKmlAGKR9yWDfwY4yoOmsujcH22S/vZqtcbFwFPDG6CjP47a7UZiKzZ7 AavEVt3nyC2T183jyBVqhyxxg1OAwt4h16WogPPm0pRlVKk0Xv57WpvVQrTzeVX/xx NqmUbz7U1Dg2PqkU/neAjQ6G8QmhG6I25MczxIES/cLPliYfF9ZRPznqFXV+50DMSL cmdaRKH/g0oWQ== Message-ID: <4456c6a3-93b5-4f47-9c04-f7953fcbd987@kernel.org> Date: Mon, 11 May 2026 18:53:00 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 09/22] mm/page_alloc: don't overload migratetype in find_suitable_fallback() 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, "Kalyazin, Nikita" , 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-v2-9-28bf1bd54f41@google.com> From: "Vlastimil Babka (SUSE)" In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: AB34720009 X-Stat-Signature: fuzcae313ofyawaga534o5soednupcf4 X-HE-Tag: 1778518388-106803 X-HE-Meta: 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 e6t1ST5h zot6cTI0rE74j4QjVDenH/hzHQu28kIEGGpJuCt7lQ03bTt2xHlFDiizEurDfBlxeDCqvlR6CsQ6lNDn5Hvw3845uY1mzyRVZ2E7c1LCHzTTZha/P5AQl98qa+fzNuazads0vDLkvPIg4TkLmftLhoif5yHbWEeOW+xeA3MxwtEDGSptITvELJz3c9y563JcevL868+ISzuYgOB7xLtvt1GMN0o2cMHSFfdDttNTn4bAa8tQJCwAN4uKChBbOgGmzdQgxHVcHHUbXxPUHYvDQFV5OehjNABbHDAiMTpy4DWfF6q5uwLkKKvtaXQHfEvr/2PJ5JQ1EU07Vy5xtXeEy7MtUFKw0gFr1wVWr Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 5/11/26 18:44, Brendan Jackman wrote: > On Mon May 11, 2026 at 1:51 PM UTC, Vlastimil Babka (SUSE) wrote: >> On 3/20/26 19:23, Brendan Jackman wrote: >>> This function currently returns a signed integer that encodes status >>> in-band, as negative numbers, along with a migratetype. >>> >>> This function is about to be updated to a mode where this in-band >>> signaling no longer makes sense. Therefore, switch to a more >>> explicit/verbose style that encodes the status and migratetype >>> separately. >>> >>> In the spirit of making things more explicit, also create an enum to >>> avoid using magic integer literals with special meanings. This enables >>> documenting the values at their definition instead of in one of the >>> callers. >>> >>> Signed-off-by: Brendan Jackman >> >> Reviewed-by: Vlastimil Babka (SUSE) > > Thanks, > > This and the prior patch could arguably just be considered independent > cleanups, shall I send them on their own? I guess why not, fewer patches in the patchset :) You're probably going to need to rebase this on current mm tree anyway for the next posting? > Equally if they feel like "churn" I'm happy to keep them in this > patchset.