From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 A73C81ADC86; Tue, 11 Mar 2025 13:13:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741698833; cv=none; b=NyPBRCsVV9QbFaOdMDzcryTZErx6znbvZEsziJTv/C4CRy3BGjj/Kgg44WY7ysVGhnmm3CL03TcKYf//Cx5AqOpsEekD11w6yIrf3kphxqXii6UHiRXuNyS0tZgM74aZKdVdJBif+h7Zl62Wnvb060E28sKCcOjQpr/9rjtAzkc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741698833; c=relaxed/simple; bh=9mLY5RPTw27hiwcuML8iH9RHXhIJmFi/AX1Jr9j1JCk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=emzWXD0s90TrGASP5PsE8muH8Q2FWJhLTfeKrURmK7kPlk5VohLgz0Vx9Ys7BG3X13YRuiM5m1jGiDK5DXE/zxEqqhkVFIIAS4dgHUgOhaXc30uUgCn9vTBv9Q5Uo+Lq0KSjn5Z0oj1hrtqQ4jgaPuNimhAz76g9/mu35rquxgI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=DYoDqYaX; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="DYoDqYaX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 44BB1C4CEF1; Tue, 11 Mar 2025 13:13:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741698833; bh=9mLY5RPTw27hiwcuML8iH9RHXhIJmFi/AX1Jr9j1JCk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DYoDqYaXzESca1O7TObIN8QSpxSi/xD2PB5a7T8nvZu0sEJsCWrrsMoJXaXy3Fb+N X7A95Kqrb5awRQksIXyMSoiLCNYjl0o+kx7k8Wk5RKYDfjkxNQOzqlvA7yM6ZtDsn4 deqaqfMz09WXH5uLgU5IFZs3P7QKPkNn9njuibwzmyoJAo8UxOdeuW+VrQOPoOs1D3 yefAl2q65NMfEp+6AiAcunyhBorOrlsEdQ0MYRyOukfnB8uyTxezqeLid6YukzwDx2 mlh1HRPPRSA4aa+gJgZwu2yExKSzdcr09E2E1wrHuSihYDNTez4BmfZFnvmIM2izCO Jk/h5MDUhypdw== From: Will Deacon To: anshuman.khandual@arm.com, catalin.marinas@arm.com, david@redhat.com, Zhenhua Huang Cc: kernel-team@android.com, Will Deacon , ardb@kernel.org, ryan.roberts@arm.com, mark.rutland@arm.com, joey.gouly@arm.com, dave.hansen@linux.intel.com, akpm@linux-foundation.org, chenfeiyang@loongson.cn, chenhuacai@kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, quic_tingweiz@quicinc.com, stable@vger.kernel.org Subject: Re: [PATCH v9] arm64: mm: Populate vmemmap at the page level if not section aligned Date: Tue, 11 Mar 2025 13:13:37 +0000 Message-Id: <174169292046.277676.9363571702356367812.b4-ty@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20250304072700.3405036-1-quic_zhenhuah@quicinc.com> References: <20250304072700.3405036-1-quic_zhenhuah@quicinc.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="utf-8" Content-Transfer-Encoding: 8bit On Tue, 04 Mar 2025 15:27:00 +0800, Zhenhua Huang wrote: > On the arm64 platform with 4K base page config, SECTION_SIZE_BITS is set > to 27, making one section 128M. The related page struct which vmemmap > points to is 2M then. > Commit c1cc1552616d ("arm64: MMU initialisation") optimizes the > vmemmap to populate at the PMD section level which was suitable > initially since hot plug granule is always one section(128M). However, > commit ba72b4c8cf60 ("mm/sparsemem: support sub-section hotplug") > introduced a 2M(SUBSECTION_SIZE) hot plug granule, which disrupted the > existing arm64 assumptions. > > [...] Applied to arm64 (for-next/fixes), thanks! [1/1] arm64: mm: Populate vmemmap at the page level if not section aligned https://git.kernel.org/arm64/c/d4234d131b0a Cheers, -- Will https://fixes.arm64.dev https://next.arm64.dev https://will.arm64.dev