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[67.164.59.41]) by smtp.googlemail.com with ESMTPSA id 5a478bee46e88-2ba9dcfe6b7sm2426463eec.29.2026.02.11.11.52.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Feb 2026 11:52:44 -0800 (PST) From: "Vishal Moola (Oracle)" To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, "Mike Rapoport (Microsoft)" Cc: akpm@linux-foundation.org, "Matthew Wilcox (Oracle)" , Dave Hansen , Andy Lutomirski , Peter Zijlstra , "Vishal Moola (Oracle)" Subject: [PATCH v5 0/4] Convert 64-bit x86/mm/pat to ptdescs Date: Wed, 11 Feb 2026 11:52:29 -0800 Message-ID: <20260211195233.368497-1-vishal.moola@gmail.com> X-Mailer: git-send-email 2.52.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit x86/mm/pat should be using ptdescs. One line has already been converted to pagetable_free(), while the allocation sites use get_free_pages(). This causes issues separately allocating ptdescs from struct page. The first patch introduces new ptdesc apis that operate on addresses. These are like get_free_pages() and free_pages() helper functions. The remaining patches convert the allocation/free sites to use ptdescs. In the short term, this helps enable Matthew's work to allocate frozen pagetables[1]. And in the long term, this will help us cleanly split ptdesc allocations from struct page[2]. The pgd_list should also be using ptdescs (for 32bit in this file). This can be done in a different patchset since there's other users of pgd_list that still need to be converted. [1] https://lore.kernel.org/linux-mm/20251113140448.1814860-1-willy@infradead.org/ [2] https://lore.kernel.org/linux-mm/20251020001652.2116669-1-willy@infradead.org/ ------ Based on current mm-new. v5: - Return a void pointer instead of unsigned long in allocation - More imperative voice in commit logs Vishal Moola (Oracle) (4): mm: Add address apis for ptdescs x86/mm/pat: Convert pte code to use ptdescs x86/mm/pat: Convert pmd code to use ptdescs x86/mm/pat: Convert split_large_page() to use ptdescs arch/x86/mm/pat/set_memory.c | 49 ++++++++++++++++++------------------ include/linux/mm.h | 4 +++ mm/memory.c | 34 +++++++++++++++++++++++++ 3 files changed, 63 insertions(+), 24 deletions(-) -- 2.52.0