Re: [PATCH 1/4] mm: Trial do_wp_page() simplification

Linus Torvalds
2020-09-17T22:25:58Z

On Thu, Sep 17, 2020 at 3:09 PM Jason Gunthorpe <jgg@ziepe.ca> wrote:
>
> My advice for this -rc fix is to go with a single bit in the mm_struct
> set on any call to pin_user_pages*

Ack, except make sure it's a byte rather than a bitfield that could
have races. Or even just a separate atomic_t.

Keep it simple ans stupid and obvious. As you say, we can aim for
cleanups later, make it obvious and reliable right now.

Linus