[PATCH 0/1] mm: move ->mremap() from file_operations to vm_operations_struct
From: Oleg Nesterov
Date: Tue Jun 23 2015 - 14:03:52 EST
On 06/22, Andy Lutomirski wrote:
> On Mon, Jun 22, 2015 at 5:47 PM, Oleg Nesterov <oleg@xxxxxxxxxx> wrote:
> > I never understood why ->mremap() lives in file_operations, not in
> > vm_operations_struct. To me vma->vm_file->f_op in move_vma() just
> > looks strange, vma->vm_ops->mremap(new_vma) looks "obviously better".
> > And afaics more useful. CRIU remaps vdso, but this does not update
> > mm->context.vdso. OK, probably this does not matter currently, CRIU
> > can't c/r the compat tasks, and 64-bit apps do not use context.vdso.
> > Afaics. Still, I think we might want to have special_mapping_remap()
> > and we can't do this because ->vm_file == NULL.
> I would like this. Then I could clean up and resubmit my patch to
> keep context.vdso up to date.
Cough... where can I find this patch ? ;)
> Oleg, can you let me know what patch, if any, I should be reviewing?
This one, it looks really trivial. And of course I will appreciate it
if you can review the special_mapping_fault() fixes.
The change in move_vma() textually depends on another patch I sent,
[PATCH 1/4] mremap: don't leak new_vma if f_op->mremap() fails
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