Messages in this thread | | | From | Linus Torvalds <> | Date | Sun, 18 Oct 2020 14:39:56 -0700 | Subject | Re: [GIT PULL] RCU changes for v5.10 |
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On Mon, Oct 12, 2020 at 7:14 AM Ingo Molnar <mingo@kernel.org> wrote: > > Please pull the latest core/rcu git tree from: > > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core-rcu-2020-10-12
I've pulled everything but that last merge and the PREEMPT_COUNT stuff that came with it.
When Paul asked whether it was ok for RCU to use preempt_count() and I answered in the affirmative, I didn't mean it in the sense of "RCU wants to force it on everybody else too".
I'm pretty convinced that the proper fix is to simply make sure that rcu_free() and friends aren't run under any raw spinlocks. So even if the cost of preempt-count isn't that noticeable, there just isn't a reason for RCU to say "screw everybody else, I want this" when there are other alternatives.
Linus
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