On Mon, Jul 30, 2018 at 09:05:55PM -0400, Rik van Riel wrote: > On Mon, 2018-07-30 at 18:26 +0200, Peter Zijlstra wrote: > > > > So for ARCH_NO_ACTIVE_MM we never touch ->active_mm and therefore > > ->active_mm == ->mm. > > Close, but not true for kernel threads, which have a > NULL ->mm, but a non-null ->active_mm that gets passed > to enter_lazy_tlb().
I'm confused on the need for this. We mark the CPU lazy, why do we still care about this?
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