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linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, fuse-devel@lists.linux.dev, Ihor Solodrai , Bert Karwatzki References: <20261009-b4-mmap-prepare-vma-flag-sanify-v5-0-923b70125b1e@kernel.org> <20261009-b4-mmap-prepare-vma-flag-sanify-v5-34-923b70125b1e@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 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QmqZAlBBuzFr40aX8ashCJ23plkvflw5U6BdPd7+hZQCMZ6cKVMF9xHCpT+ep9mCzqeY+vQRPPden4+CE3ERFkmItfUelaEZ0J6xnklDQkkdmU8FiT3raogPgDUvuSCd5myH9C6p5qUw7n1gLqagI0RUNsQogtwhFt3PJCAKW4PtTFyAthrujpy261EHdb4e4nxqlhAxzsMzDu5j7qQE0cp29KryCy2QvyMTluu/5mHnNsqSAhO1cR52AOTlZCYiM7d9LndHS4pMK9xsBafcL8eMk3zG1YSvqFTQk+cUjOByXFE1dwQduZY9n0qyeLTXRg4bDOH7V0eReXdhoc+lM3SLMVOH72Z3r3PE3M8UWx9yJYws7DOo8nEY/FujglrPOSUw9a17e8Pg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 10/9/26 20:04, Lorenzo Stoakes (ARM) wrote: > A fixed or non-mm-managed mapping is one which sets VMA_PFNMAP_BIT, > VMA_MIXEDMAP_BIT or VMA_DONTEXPAND_BIT, which is precisely what > VMA_SPECIAL_FLAGS tests for other than VMA_IO_BIT, which is safe to drop as > mm-managed mappings may not set it. > > Using these predicates rather than VMA_SPECIAL_FLAGS makes the check > self-documenting and helps eliminate the confusion around 'special' flags. > > No functional change intended. > > Reviewed-by: Zi Yan > Acked-by: David Hildenbrand (Arm) > Signed-off-by: Lorenzo Stoakes (ARM) > --- > mm/vmscan.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/mm/vmscan.c b/mm/vmscan.c > index 3b318efa2916..7adffe8182b3 100644 > --- a/mm/vmscan.c > +++ b/mm/vmscan.c > @@ -4418,8 +4418,8 @@ bool lru_gen_look_around(struct page_vma_mapped_walk *pvmw, unsigned int nr) > if (spin_is_contended(pvmw->ptl)) > return true; > > - /* exclude special VMAs containing anon pages from COW */ > - if (vma->vm_flags & VM_SPECIAL) > + /* exclude fixed and non-mm-managed VMAs containing anon pages from COW */ > + if (!vma_is_mm_managed(vma) || vma_is_fixed_mapping(vma)) > return true; If you keep the droppable thing out there you can just use vma_is_mm_backed() here I think. Acked-by: David Hildenbrand (Arm) -- Cheers, David