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Miller" , Andreas Larsson , Arnd Bergmann , Greg Kroah-Hartman , Dan Williams , Vishal Verma , Dave Jiang , Nicolas Pitre , Muchun Song , Oscar Salvador , David Hildenbrand , Konstantin Komarov , Baoquan He , Vivek Goyal , Dave Young , Tony Luck , Reinette Chatre , Dave Martin , James Morse , Alexander Viro , Christian Brauner , Jan Kara , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Hugh Dickins , Baolin Wang , Uladzislau Rezki , Dmitry Vyukov , Andrey Konovalov , Jann Horn , Pedro Falcato , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-csky@vger.kernel.org, linux-mips@vger.kernel.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, linux-mm@kvack.org, ntfs3@lists.linux.dev, kexec@lists.infradead.org, kasan-dev@googlegroups.com Subject: Re: [PATCH 10/16] mm/hugetlb: update hugetlbfs to use mmap_prepare, mmap_complete Message-ID: References: <346e2d1e768a2e5bf344c772cfbb0cd1d6f2fd15.1757329751.git.lorenzo.stoakes@oracle.com> <20250908131121.GA616306@nvidia.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250908131121.GA616306@nvidia.com> X-ClientProxiedBy: LO4P123CA0377.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:18e::22) To 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List-Unsubscribe: On Mon, Sep 08, 2025 at 10:11:21AM -0300, Jason Gunthorpe wrote: > On Mon, Sep 08, 2025 at 12:10:41PM +0100, Lorenzo Stoakes wrote: > > @@ -151,20 +123,55 @@ static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) > > vm_flags |= VM_NORESERVE; > > > > if (hugetlb_reserve_pages(inode, > > - vma->vm_pgoff >> huge_page_order(h), > > - len >> huge_page_shift(h), vma, > > - vm_flags) < 0) > > + vma->vm_pgoff >> huge_page_order(h), > > + len >> huge_page_shift(h), vma, > > + vm_flags) < 0) { > > It was split like this because vma is passed here right? > > But hugetlb_reserve_pages() doesn't do much with the vma: > > hugetlb_vma_lock_alloc(vma); > [..] > vma->vm_private_data = vma_lock; > > Manipulates the private which should already exist in prepare: > > Check non-share a few times: > > if (!vma || vma->vm_flags & VM_MAYSHARE) { > if (vma && !(vma->vm_flags & VM_MAYSHARE) && h_cg) { > if (!vma || vma->vm_flags & VM_MAYSHARE) { > > And does this resv_map stuff: > > set_vma_resv_map(vma, resv_map); > set_vma_resv_flags(vma, HPAGE_RESV_OWNER); > [..] > set_vma_private_data(vma, (unsigned long)map); > > Which is also just manipulating the private data. > > So it looks to me like it should be refactored so that > hugetlb_reserve_pages() returns the priv pointer to set in the VMA > instead of accepting vma as an argument. Maybe just pass in the desc > instead? Well hugetlb_vma_lock_alloc() does: vma_lock->vma = vma; Which we cannot do in prepare. This is checked in hugetlb_dup_vma_private(), and obviously desc is not a stable pointer to be used for comparing anything. I'm also trying to do the minimal changes I can here, I'd rather not majorly refactor things to suit this change if possible. > > Then no need to introduce complete. I think it is probably better to > try to avoid using complete except for filling PTEs.. I'd rather do that yes. hugetlbfs is the exception to many rules, unfortunately. > > Jason Cheers, Lorenzo