On Mon, Jun 16, 2025 at 08:33:19PM +0100, Lorenzo Stoakes wrote: > The intent is to gradually deprecate f_op->mmap, and in that vein this > series coverts the majority of file systems to using f_op->mmap_prepare. I saw this on lwn and just wanted to give a little bit of thought on this topic.. It looks to me like we need some more infrastructure to convert anything that uses remap_pfn/etc in the mmap() callback I would like to suggest we add a vma->prepopulate() callback which is where the remap_pfn should go. Once the VMA is finalized and fully operational the vma_ops have the opportunity to prepopulate any PTEs. This could then actually be locked properly so it is safe with concurrent unmap_mapping_range() (current mmap callback is not safe) Jason
