Messages in this thread | | | Date | Sun, 29 May 2011 13:01:58 +0100 | Subject | Re: [BUG] "sched: Remove rq->lock from the first half of ttwu()" locks up on ARM | From | Catalin Marinas <> |
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On Sunday, 29 May 2011, Russell King - ARM Linux <linux@arm.linux.org.uk> wrote: > On Sun, May 29, 2011 at 11:21:19AM +0100, Catalin Marinas wrote: >> To avoid extra per-thread flags, we could set a per-cpu variable in >> switch_mm() so that we know what to switch the page tables to in the >> post-switch hook. > > Why do we need to add more per-cpu stuff when we already have easy access > to the thread flags?
It could work, I was thinking that we only get an mm structure in the post-switch hook.
BTW, we currently have a per-cpu current_mm variable in context.c because switch_mm() is called before switch_to() and the CPU may receive an IPI to reset the ASID in this interval. But we can remove it entirely if we set the ASID in the post-switch hook and run the main switch code with interrupts disabled.
-- Catalin
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