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b=macFNaFBbpsX9/6u2Pgy1/4vXZApG1r1E4HHNo2+PQpwfaNoImd3nZ/pijk8QyBh7 5Qmmt/2tsXtkNyT3ZX/mp9eteN28sUEJEmDNjIpyGk1K07An6f6D/26tKJ55duYBhN zCqlGduHUAwTP0TnBFel3P8TjyNKbEYzYdVUugR6zof6RI8UfXkR+09l4gh1TWYeZb bZTNUyM/IddcMWZC4p3VW9UPLst/pHTnVL6cLIfgInkXwOMdcs7qshacZbTADsBWpj gLRs9iKUiEwPUP7jTRaJGzywvo2PXXqZy//mc/0ujyJsRG83pSEHDtBCqwoS9w55Lr 97aZIGomqcakQ== Date: Mon, 21 Sep 2026 14:25:46 +0200 From: "Oscar Salvador (SUSE)" To: Muchun Song Cc: Andrew Morton , Dan Williams , David Hildenbrand , linux-mm@kvack.org, nvdimm@lists.linux.dev, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-cxl@vger.kernel.org, Vishal Verma , Dave Jiang , Alison Schofield , Mike Rapoport , Oscar Salvador , Ira Weiny , Jan Kara , Matthew Wilcox , Lorenzo Stoakes , Vlastimil Babka , Michal Hocko , Qi Zheng , muchun.song@linux.dev Subject: Re: [PATCH 1/4] mm: generalize vmemmap remap architecture support Message-ID: References: <20260903122128.12264-1-songmuchun@bytedance.com> <20260903122128.12264-2-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260903122128.12264-2-songmuchun@bytedance.com> X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 24FB12000E X-Stat-Signature: rq86ffogwzhmfn8trfao4hstf6shsbjx X-Rspam-User: X-HE-Tag: 1789993555-458771 X-HE-Meta: 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 dUj5UvQG hBBJfl4xGbBhLEqMp9JRwkFW9ulcEejDMz0jqsy9z6LvmtyONZph5UGWbVXpRRQDWW4jlb/b4Xy2ChSMVH7W0/u6kyXRogh/2ikZa23RVXIL2STq5/Mn1OiBZ6ZTQBAJdjwBBCD49pJqoZR5SwQCMdGxr0fW/TMsHou8o71GOTp0Fx129XUOyvpxjEjuoGwEwqQ6D9VQfHUHko4BvcWAvyphRYw9b93KIzGo3Qk/X6WQVTBU= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Sep 03, 2026 at 08:21:24PM +0800, Muchun Song wrote: > ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP is named after its first user, but > the underlying requirement is not HugeTLB-specific. Generic MM only needs > to know whether an architecture can safely remap populated vmemmap PTEs at > run time. > > Rename the architecture opt-in to ARCH_SUPPORTS_VMEMMAP_REMAP and make > HugeTLB vmemmap optimization depend on that generic capability. This also > prepares for FS-DAX vmemmap optimization, which relies on the same runtime > remap support. > > Signed-off-by: Muchun Song Reviewed-by: Oscar Salvador -- Oscar Salvador SUSE Labs