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linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, fuse-devel@lists.linux.dev References: <20260917-b4-mmap-prepare-vma-flag-sanify-v3-0-4583d8a23bca@kernel.org> <20260917-b4-mmap-prepare-vma-flag-sanify-v3-39-4583d8a23bca@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb 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nOv2HrQF/fFl3yNDf+1qRTkvWU6PEWPT5nVzxoOFkScE3K7t5wuER8+JhNvnyIeygRa/B+Ma5YXC7iTIUYp7IO2aFg5RkdEZ9JvLLa3TNqXDMWq2TS8nsLt7dGAdeIe7eQmP9QMqNGRZUUytDtr3jFkCGlEVDAHd8L4mkxb1LqUmJD/jPCUZ8FbAYtVO1MYMH4Y3ppc5Q1Tp5skTHhAsWCzl/zaVkBldocu8WFkpVHZrwXhsGCwzRVAnjOArv8qXJvU0Xhb4TkBhB//v1EFtXti9AulHxypX8ERhxfS+9GtzKtLZdWSYVEnU35v3ETvEBwZzeRQEhsyoyCV6sM9rmo0pD71g9vbeEivCSGuW+C162wiSz/gdmn Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/17/26 18:22, Lorenzo Stoakes (ARM) wrote: > vma_is_special_huge() tests whether either the VMA_PFNMAP_BIT or > VMA_MIXEDMAP_BIT is set (i.e. whether the VMA is a kernel-owned mapping), > but with a DAX carve-out. > > DAX however no longer sets VMA_MIXEDMAP_BIT, so this carve-out is no longer > required. > > Therefore test for vma_is_kernel_owned() instead and also drop the > VMA_IO_BIT check, as it is now redundant since it is enforced that only > kernel-owned mappings can set this flag. > > This also eliminates another overloaded use of 'special' within mm. > > No functional change intended. > > Signed-off-by: Lorenzo Stoakes (ARM) > --- > mm/huge_memory.c | 18 ++++-------------- > 1 file changed, 4 insertions(+), 14 deletions(-) > > diff --git a/mm/huge_memory.c b/mm/huge_memory.c > index c3c98ea672c3..3cb8e2d4d65c 100644 > --- a/mm/huge_memory.c > +++ b/mm/huge_memory.c > @@ -110,14 +110,6 @@ static inline bool file_thp_enabled(const struct vm_area_struct *vma) > return S_ISREG(inode->i_mode); > } > > -/* If returns true, we are unable to access the VMA's folios. */ > -static bool vma_is_special_huge(const struct vm_area_struct *vma) > -{ > - if (vma_is_dax(vma)) > - return false; > - return vma_test_any(vma, VMA_PFNMAP_BIT, VMA_MIXEDMAP_BIT); > -} > - > static bool vma_file_bypass_thp_tuneables(const struct vm_area_struct *vma, > enum tva_type type) > { > @@ -192,7 +184,7 @@ unsigned long __thp_vma_allowable_orders(struct vm_area_struct *vma, > /* Check the intersection of requested and supported orders. */ > if (vma_is_anonymous(vma)) > supported_orders = THP_ORDERS_ALL_ANON; > - else if (vma_is_dax(vma) || vma_is_special_huge(vma)) > + else if (vma_is_dax(vma) || vma_is_kernel_owned(vma)) > supported_orders = THP_ORDERS_ALL_SPECIAL_DAX; > else > supported_orders = THP_ORDERS_ALL_FILE_DEFAULT; > @@ -3066,7 +3058,7 @@ int zap_huge_pud(struct mmu_gather *tlb, struct vm_area_struct *vma, > orig_pud = pudp_huge_get_and_clear_full(vma, addr, pud, tlb->fullmm); > arch_check_zapped_pud(vma, orig_pud); > tlb_remove_pud_tlb_entry(tlb, pud, addr); > - if (vma_is_special_huge(vma)) { > + if (vma_is_kernel_owned(vma)) { > spin_unlock(ptl); > /* No zero page support yet */ > } else { > @@ -3222,7 +3214,7 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd, > */ > if (arch_needs_pgtable_deposit()) > zap_deposited_table(mm, pmd); > - if (vma_is_special_huge(vma)) > + if (vma_is_kernel_owned(vma)) > return; > if (unlikely(pmd_is_migration_entry(old_pmd))) { > const softleaf_t old_entry = softleaf_from_pmd(old_pmd); > @@ -4765,9 +4757,7 @@ static inline bool vma_not_suitable_for_thp_split(struct vm_area_struct *vma) > { > if (vma_is_dax(vma)) > return true; > - if (vma_is_special_huge(vma)) > - return true; > - if (vma_test(vma, VMA_IO_BIT)) > + if (vma_is_kernel_owned(vma)) > return true; > if (vma_is_hugetlb(vma)) > return true; > So good to see that horrible shit (sorry :) ) go away. It was too hugely special. -- Cheers, David