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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-v3-38-4583d8a23bca@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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m9gKsl8lXt1UkNyla3m7mAACJ4+TQvgVBPeyTYdj4ZFVG7V+9THDZbkuU2jo53tDoGjZZGuLfIsblarSK64tgeQQlGc5RUPs5HA9fstWUSwOl2C954CfsDrlC7zZ/dKAhhUmAFJzri+f2/BZjCgUxmRjhrfY7+cT8pzaoNtKUKLCCz89n6oVW4qML9a+bcwoYrGV//EdKhN7jTZDZU557w5At24W6LUd+kp3u9KZ9avWvGmnLPhJjyC/3ReNTOXN/pqo9krqDZacSkwvFSSvL3Fn3lQsgyXQAE5n5wmCAsunaLAufT4Q/BxmKVtfh8px3oNwCd1ejlPp85ckRGy/dJ+dSf2ury7UKdWZSNFwADTl7fGJ7K/t39 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: > Commit e1fb4a086495 ("dax: remove VM_MIXEDMAP for fsdax and device dax") > prevented fsdax and device-dax from setting VM_MIXEDMAP, as DAX no longer > relies on it to direct core mm paths. > > The fuse DAX implementation, added later, copied the old pattern and still > sets it. > > Fuse DAX maps pages the same way fsdax does, via dax_iomap_fault() and > ultimately vmf_insert_page_mkwrite() and vmf_insert_folio_pmd(), which > insert ordinary refcounted pages and so do not require VM_MIXEDMAP. > > Setting it only serves to mark the mapping as kernel-owned, making fuse DAX > the sole DAX implementation whose mappings are unmergeable, cannot be > mlock()'d, eagerly copy page tables on fork and reject MADV_DOFORK and > MADV_DODUMP. > > It also requires vma_is_special_huge() in mm/huge_memory.c to carve DAX out > of its kernel-owned check explicitly. > > There is no reason for fuse DAX to keep on using this flag so drop it. > > Signed-off-by: Lorenzo Stoakes (ARM) > --- > fs/fuse/dax.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/fs/fuse/dax.c b/fs/fuse/dax.c > index 85cdf0199bc0..a5994f1c637d 100644 > --- a/fs/fuse/dax.c > +++ b/fs/fuse/dax.c > @@ -826,7 +826,7 @@ int fuse_dax_mmap(struct file *file, struct vm_area_struct *vma) > { > file_accessed(file); > vma->vm_ops = &fuse_dax_vm_ops; > - vm_flags_set(vma, VM_MIXEDMAP | VM_HUGEPAGE); > + vma_set_flags(vma, VMA_HUGEPAGE_BIT); Yes, I think I stumbled over that in the past as well: Acked-by: David Hildenbrand (Arm) -- Cheers, David