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Howlett" , Andrew Morton , Vlastimil Babka , Mike Rapoport , Michal Hocko , Matthew Wilcox , Vinicius Costa Gomes Cc: iommu@lists.linux.dev, security@kernel.org, x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Dave Hansen , Lu Baolu Subject: [PATCH v7 5/8] mm: Introduce pure page table freeing function Date: Wed, 22 Oct 2025 16:26:31 +0800 Message-ID: <20251022082635.2462433-6-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251022082635.2462433-1-baolu.lu@linux.intel.com> References: <20251022082635.2462433-1-baolu.lu@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 46F3D40003 X-Rspamd-Server: rspam02 X-Stat-Signature: azz4sdew9r1hx4pox6hkorawzp4mdsri X-HE-Tag: 1761121788-432886 X-HE-Meta: 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 8wABozgm oyuPydg/TMw3qlVpssuJfoWs5MIibHNXdVgX50QHj6j+8PIKIl3c/0YRqMR2vTKD60NHFikZOnTIv7OjIen8KU++IgWfH1WKkiVTyfZsHjTuuFwa4ccJOpEh9ey/f0EAwvdJL7iQPO1iJFpUs8aPEeUiTDUNHXTsB4hNtPUruX5lC9Jgz1NnI9AOvW3dEWWRSvowpXwxvkCnSo7w/27VV6r5BRmMSMBkWcsyb0gOtkXvThGLpV1nGvn9gLV/AKFGQkxRjY9QgxKaq6voSMg/lqt4GpA== 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: From: Dave Hansen The pages used for ptdescs are currently freed back to the allocator in a single location. They will shortly be freed from a second location. Create a simple helper that just frees them back to the allocator. Signed-off-by: Dave Hansen Signed-off-by: Lu Baolu Reviewed-by: Jason Gunthorpe Reviewed-by: Kevin Tian Acked-by: David Hildenbrand Acked-by: Mike Rapoport (Microsoft) --- include/linux/mm.h | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index cca5946a9771..52ae551d0eb4 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3024,6 +3024,13 @@ static inline struct ptdesc *pagetable_alloc_noprof(gfp_t gfp, unsigned int orde } #define pagetable_alloc(...) alloc_hooks(pagetable_alloc_noprof(__VA_ARGS__)) +static inline void __pagetable_free(struct ptdesc *pt) +{ + struct page *page = ptdesc_page(pt); + + __free_pages(page, compound_order(page)); +} + /** * pagetable_free - Free pagetables * @pt: The page table descriptor @@ -3033,12 +3040,10 @@ static inline struct ptdesc *pagetable_alloc_noprof(gfp_t gfp, unsigned int orde */ static inline void pagetable_free(struct ptdesc *pt) { - struct page *page = ptdesc_page(pt); - if (ptdesc_test_kernel(pt)) ptdesc_clear_kernel(pt); - __free_pages(page, compound_order(page)); + __pagetable_free(pt); } #if defined(CONFIG_SPLIT_PTE_PTLOCKS) -- 2.43.0