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b=wzQff/eOT+u+AtG0ZT7G/dp+QoLv+4GFH94A5lV3pU0eEqGgk8EvbQRAOGvEVTd4I mfQDv4TisX/2jopNlzVHMN/2BjVh+CnmXeS4Rz+/E7qk547VHFMs0RSvknkpFmbtYw keHCHB/Jw+T0Zqp2c/lIb96W47aiPk3Eu49oXr2E= Date: Wed, 19 Feb 2025 15:52:12 -0800 From: Andrew Morton To: Luiz Capitulino Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, david@redhat.com, yuzhao@google.com, pasha.tatashin@soleen.com, hannes@cmpxchg.org, muchun.song@linux.dev Subject: Re: [PATCH 0/4] mm: page_ext: Introduce new iteration API Message-Id: <20250219155212.9474b8c44bd58780a54c8a6e@linux-foundation.org> In-Reply-To: References: X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 1A1072000B X-Stat-Signature: xf4c3rcf8ux411smrysgq13u4mg87opi X-HE-Tag: 1740009134-786496 X-HE-Meta: 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 A1/ub6zr xoEELX+O75sKGHepSi6TlJ+6PMoZah3SGXiuVY7Y7vyFFIOAA5naQOpgGLCEv6oTIIDttTtYvWVP+eTVu+MTLFEW+gYO8BwBnpKyUujFcZtxCVnDq1TtjzAkGwPK5ULsBgQs931zYtITbYa2QZF51AcQ2zYIVvaBzpkefrz1NsjhAWPiasZT7qLh/QSkVIYQ8GfULq4DNF4i7fC3XUN55G2xMLoXaf2iyYx5xg87U4kBzRPqntsrDYrPVN8bjr6ZyG0/Kkm5UsA25RGcUOa4LvjiSdafFmpm4tPTu8vcxr98fz04JUNyQuqJyPnuWfPT8SeHP 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, 18 Feb 2025 21:17:46 -0500 Luiz Capitulino wrote: > To fix this, this series introduces a new iteration API for page extension > objects. The API checks if the next page extension object can be retrieved > from the current section or if it needs to look up for it in another > section. > > ... A regression since 6.12, so we should backport the fix. > ... > > include/linux/page_ext.h | 67 +++++++++++++++++++++++++++++++++++++--- > mm/page_ext.c | 48 ++++++++++++++++++++++++++++ > mm/page_owner.c | 61 +++++++++++++++++------------------- > mm/page_table_check.c | 39 +++++++---------------- > 4 files changed, 152 insertions(+), 63 deletions(-) That's a lot to backport! Is there some quick-n-dirty fixup we can apply for the sake of -stable kernels, then work on this long-term approach for future kernels?