On Fri, Aug 11, 2017 at 2:03 AM, Peter Zijlstra <pet...@infradead.org> wrote:
> I'm sure we talked about using HAVE_RCU_TABLE_FREE for x86 (and yes that
> would make it work again), but this was some years ago and I cannot
> readily find those emails.
I think the only time we really talked about HAVE_RCU_TABLE_FREE for
x86 (at least that I was cc'd on) was not because of RCU freeing, but
because we just wanted to use the generic page table lookup code on
x86 *despite* not using RCU freeing.
And we just ended up renaming HAVE_GENERIC_RCU_GUP as HAVE_GENERIC_GUP.
There was only passing mention of maybe making x86 use RCU, but the
discussion was really about why the IF flag meant that x86 didn't need
I don't recall us ever discussing *really* making x86 use RCU.