Re: [PATCH v2 0/3] Create 'old' ptes for faultaround mappings on arm64 with hardware access flag

[Kirill A. Shutemov]

On Fri, Jan 08, 2021 at 11:34:08AM -0800, Linus Torvalds wrote:
> I still dislike how we basically randomly modify the information in
> that 'vmf' thing.

I wounder if it would be acceptable to pass down to faultaround a copy
of vmf, so it mess with it without risking to corrupt the original one?

We would need to transfer back prealloc_pte, but the rest can be safely
discarded, I believe.

But it's somewhat wasteful of stack. sizeof(vmf) == 96 on x86-64.

-- 
 Kirill A. Shutemov