From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B311C427F8B; Mon, 21 Sep 2026 12:25:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789993555; cv=none; b=a5d5xHjhNUFzqDeccS1Lw9H5GaO17PU6vfswZ8yGqOjBqlzL1wPOKrnONKzgtN6wGm0lumk0BUEP5Ze6GyQSTmEy0Q9GChbTvDAFiAF+yD6xSFQpnMapTczNpuW8U/jJN6a0L/H8MWZmUj2vqa3zUN7G3E/hkkh8Pjueo8AcojM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789993555; c=relaxed/simple; bh=2KCxDgAfRk1E0e6fkZpJQBC1l+rbvo8MkXgXjnUJOJs=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=eMYB8t1nB1ZNligYoHYx7+mshHKmhObPRPhdebjTECPMTr2gRt+DS9BA/NI7RYw83NCewuUOsoGZBQcZsZYbV8nogJCubJBtVXUw+Eoe6bboK0Y3z9SfmQ8OaFHLnxHhRCEs8BCOW9GBMhd4h6eU4TvBoHy2im6e5IvIjsHM1oY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=macFNaFB; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="macFNaFB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B02D41F000FF; Mon, 21 Sep 2026 12:25:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789993554; bh=ZAdc5FO1i9grgLMSpUoVxK5/k0rBXY6fo8pkrWSvNnI=; h=Date:From:To:Cc:Subject:References:In-Reply-To; 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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260903122128.12264-2-songmuchun@bytedance.com> 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