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[80.187.83.189]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-426ce5d0061sm434778f8f.30.2025.10.09.12.26.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Oct 2025 12:26:24 -0700 (PDT) Message-ID: <646c392c-0a3d-46f6-9d81-c007d6a736da@redhat.com> Date: Thu, 9 Oct 2025 21:26:22 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 4/8] mm: Introduce pure page table freeing function To: Lu Baolu , Joerg Roedel , Will Deacon , Robin Murphy , Kevin Tian , Jason Gunthorpe , Jann Horn , Vasant Hegde , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , Alistair Popple , Peter Zijlstra , Uladzislau Rezki , Jean-Philippe Brucker , Andy Lutomirski , Yi Lai Cc: iommu@lists.linux.dev, security@kernel.org, x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Dave Hansen References: <20250919054007.472493-1-baolu.lu@linux.intel.com> <20250919054007.472493-5-baolu.lu@linux.intel.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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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 > --- > 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 f3db3a5ebefe..668d519edc0f 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -2884,6 +2884,13 @@ 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 > @@ -2893,12 +2900,10 @@ 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) Acked-by: David Hildenbrand -- Cheers David / dhildenb