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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> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 4E2B08001D X-Rspamd-Server: rspam03 X-Stat-Signature: droogowns1kdoyifp1hsumf3w9woji6k X-HE-Tag: 1741698834-762845 X-HE-Meta: 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 AzpNAJIG ngEW3PQC2ZATloie63VBhW7SeS9SK8tVJbaKt3TRxK6dMT6ZDercaAmpGc/XWtm/rK2LC06kT2z5Jk/6CgLM2uiVlarpJ6+O+9Ck+vGOUl6gwYBS+DjMgDTeyH5Ku5J0YiYu+SKQzPYpdrAOlgaNfNpIxe8lVmlY1qvzBQsTMiSkLgSp0taFwL6BbwGqVdLQxyu3rzIbCsmxSL6/Ldq+fW5mzXtT1W7UG2C8Ng7rTB0/VAWL6V0NrpU5spbE2GansHkYeYgTO0h5TUeAz4gp6V5hMwJRXFp2Qfb8FkYL1LS7uD/takOGBJBMSqA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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