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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-v3-35-4583d8a23bca@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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gQt9sAP+GOJvltUdsuhjK/01SCnXfi1kC+gOyxqK9H8vS7lOUMxHDaczG5/kCc5OSOapn7qlzk8z99H5rutf0wERRHuXgQJWbTJtbc8h80IFbrx3ejDJMtxb38oFmXSBeMziFHrlPu3vJSqmkXVEShhE+vMsYO8QFo+RuI7FaSmSBNKReR/oFW6mlDQDMQLESjT5EJIw7JjR/y5s4LRuydYIhlj25llNUbKgeDc1IgiD3mbl/sI3eBXugeASIW+crCuDinokQVTikAm2VoJz9/66iYYJ6YGq3sOYXpxGeJATSjye/RCuVeluwvpn289dEOfcyM40UDV9QrqJqwYvhIIMKYOWxLdvt17P1QUy4leHgY4Ee/hGUN 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: > A kernel-owned or fixed 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 > only kernel-owned mappings may 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. > > 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 09ff20c3df5b..001f8b760266 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 kernel-owned and fixed VMAs containing anon pages from COW */ > + if (vma_is_kernel_owned(vma) || vma_is_fixed_mapping(vma)) > return true; Acked-by: David Hildenbrand (Arm) -- Cheers, David