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SubjectRe: [PATCH v2 3/4] sparc64: remove mm_cpumask clearing to fix kthread_use_mm race
From: Nicholas Piggin <>
Date: Mon, 14 Sep 2020 14:52:18 +1000

> The basic fix for sparc64 is to remove its mm_cpumask clearing code. The
> optimisation could be effectively restored by sending IPIs to mm_cpumask
> members and having them remove themselves from mm_cpumask. This is more
> tricky so I leave it as an exercise for someone with a sparc64 SMP.
> powerpc has a (currently similarly broken) example.
> Signed-off-by: Nicholas Piggin <>

Sad to see this optimization go away, but what can I do:

Acked-by: David S. Miller <>

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