Re: [PATCH 2/2] mm: soft_dirty: userfaultfd: introduce wrprotect_tlb_flush_pending

Will Deacon
2021-01-08T12:49:21Z

On Thu, Jan 07, 2021 at 04:25:54PM -0800, Linus Torvalds wrote:
> Please. Why is the correct patch not the attached one (apart from the
> obvious fact that I haven't tested it and maybe just screwed up
> completely - but you get the idea)?

It certainly looks simple and correct to me, although it means we're now
taking the mmap sem for write in the case where we only want to clear the
access flag, which should be fine with the thing only held for read, no?

Will