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Fri, 6 Mar 2026 14:41:34 +0000 (UTC) Date: Fri, 6 Mar 2026 15:41:25 +0100 From: Borislav Petkov To: Brendan Jackman Cc: "Vlastimil Babka (SUSE)" , Dave Hansen , Peter Zijlstra , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , Wei Xu , Johannes Weiner , Zi Yan , 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 Subject: Re: [PATCH RFC 00/19] mm: Add __GFP_UNMAPPED Message-ID: <20260306144125.GIaarnleCxQjM2Ocm6@fat_crate.local> References: <20260225-page_alloc-unmapped-v1-0-e8808a03cd66@google.com> <6206d021-e6c2-4899-b426-cacd71ebd5ef@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-Stat-Signature: zzegjxwkrutaqb7dz5kfbt7hydwnbfbw X-Rspamd-Server: rspam09 X-Rspam-User: X-Rspamd-Queue-Id: 2DCAD1C0017 X-HE-Tag: 1772808127-871919 X-HE-Meta: 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 gQ4RCOD9 k8RmpTQwLuFr8UCReoQgjamRt/KHNCvOGXts6qrgL1khKUgsv5PlsxY8Jjdxr8/i6RU+QL9BSo2TiH0DNDhP4u5CsdgjACis5Q267l6JqhAe/Qwx0ViCU/V5yuxC5W7x3E8FDsTfxvqzArLdzK0FCGqBn41QWf/++Le1xKt0wouHG1c8xce0fysWM+rrBLscwifqbXq8POiYCzLi4OeiABCi38Elv5Ch6jFpYfFPxmyKBI771rPVjVByJIvwr32UTxXiOnNLlTk8htQDA/UTBi/G1nw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Mar 05, 2026 at 11:16:07AM +0000, Brendan Jackman wrote: > Ultimately the fact that we have KPTI for 32-bit makes it sound like we > would also want ASI for 32-bit, so I guess I would still want to add a > GFP flag to support that on 32-bit. But that's a pretty futuristic > problem, I would say we should focus on __GFP_UNMAPPED in isolation > right now. I'd wait until someone really really presents a valid use case to not move to 64-bit. And then justify the effort for adding and supporting ASI on 32-bit. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette