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linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, fuse-devel@lists.linux.dev, Ihor Solodrai , Bert Karwatzki , Emil Tsalapatis References: <20261009-b4-mmap-prepare-vma-flag-sanify-v5-0-923b70125b1e@kernel.org> <20261009-b4-mmap-prepare-vma-flag-sanify-v5-13-923b70125b1e@kernel.org> <5b8ef0ce-7429-4d74-b4da-a0561c59b1e2@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 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zLKqDQNK6+xOYl91Pj1FG5TsxPWDH4mGLG6DRe1CO22V/Te/jU2FBXu6MoTRVYBBObKmMh01nXiJUxWUcABMrEZQXVDZbcRA6ZW/aX1Y6qAZCAXwLcOM2OaIsFFwTm60OjaIe0dT7C2uQcAprpSrynvXgsRaTBrV15BD/a2RnkY/EFYrGeJls3YZu8jnR8lXkblVklDpfgdIidVVPbXV7VwfZ34wc9AySsGRRDA0m3qnUqCR8qwUyWNqQQYfvVXWYH/2apYx8AbpCACxI4DHU39vLioP8ZoE4mlrwnUWSe7LmIh1iobkfZAmfzkOkbkiyZbA6sLH5KnEAZSZ1RwmaAZXHH0vJ2flA= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 10/12/26 17:55, Lorenzo Stoakes (ARM) wrote: > On Mon, Oct 12, 2026 at 05:08:09PM +0200, David Hildenbrand (Arm) wrote: >> On 10/9/26 20:04, Lorenzo Stoakes (ARM) wrote: > >>> diff --git a/kernel/bpf/arena.c b/kernel/bpf/arena.c >>> index 7b6847200b43..b69fe5e34339 100644 >>> --- a/kernel/bpf/arena.c >>> +++ b/kernel/bpf/arena.c >>> @@ -620,8 +620,9 @@ static int arena_map_mmap(struct bpf_map *map, struct vm_area_struct *vma) >>> * clears VM_MAYEXEC. Set VM_DONTEXPAND to avoid potential change >>> * of user_vm_start. Set VM_DONTCOPY to prevent arena VMA from >>> * being copied into the child process on fork. >>> + * This is a kernel page so set VM_MIXEDMAP. >>> */ >>> - vm_flags_set(vma, VM_DONTEXPAND | VM_DONTCOPY); >>> + vm_flags_set(vma, VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTCOPY); >>> vma->vm_ops = &arena_vm_ops; >>> return 0; >>> } >>> >> >> Historically, VM_MIXEDMAP really just means: can contain refcounted and >> non-refcounted things. Everything with a struct page is refcounted. >> >> I think we are now changing the semantics to mean "maps kernel pages". I think > > Yes. > > It was sort of implicit before given insert_page() etc. but still really meaning > that it _might_ be both. Yeah, it's in the name. Mixed: pfn and/or ordinary. > >> this is fine, but we really have to update the documentation (and possibly >> rename this thing to something more expressive?) > > Yeah I completely agree. > > I will rename it, but I think that's best for 7.5 obviously! :) Yes. VM_PFNMAP / VM_MIXEDMAP - These contain kernel-mapped data which cannot be reasonably reconstructed on page fault. the description is already pretty clear. just not that kernel-mapped pages *must* use one of these. (again, the ->fault thing returning allcoated kernel memory is nasty) -- Cheers, David