Re: [PATCH v2 tip/core/rcu 01/22] smpboot: Add common code for notification from dying CPU
From: Peter Zijlstra <hidden>
Date: 2015-03-17 08:18:18
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linux-api, lkml
On Mon, Mar 16, 2015 at 11:37:45AM -0700, Paul E. McKenney wrote:
From: "Paul E. McKenney" <redacted> RCU ignores offlined CPUs, so they cannot safely run RCU read-side code. (They -can- use SRCU, but not RCU.) This means that any use of RCU during or after the call to arch_cpu_idle_dead(). Unfortunately, commit 2ed53c0d6cc99 added a complete() call, which will contain RCU read-side critical sections if there is a task waiting to be awakened.
Got a little more detail there?