Re: [PATCH RFC 00/19] mm/gup: remove FOLL_FORCE usage from drivers (reliable R/O long-term pinning)

On 07.11.22 18:27, Linus Torvalds wrote:

On Mon, Nov 7, 2022 at 8:18 AM David Hildenbrand david@redhat.com wrote:

...

So instead, make R/O long-term pinning work as expected, by breaking COW in a COW mapping early, such that we can remove any FOLL_FORCE usage from drivers.

Nothing makes me unhappy from a quick scan through these patches.

And I'd really love to just have this long saga ended, and FOLL_FORCE finally relegated to purely ptrace accesses.

So an enthusiastic Ack from me.

Thanks Linus! My hope is that we can remove it from all drivers and not have to leave it in for some corner cases; so far it looks promising.