Re: [RFC][PATCH 04/11] sched: Rework TASK_DEAD preemption exception
From: Frederic Weisbecker
Date: Tue Sep 29 2015 - 09:41:46 EST
On Tue, Sep 29, 2015 at 11:28:29AM +0200, Peter Zijlstra wrote:
> TASK_DEAD is special in that the final schedule call from do_exit()
> must be done with preemption disabled.
> This leads to a violation of our new scheduling invariant which states
> that the preempt count should be 2. Move the check for TASK_DEAD out
> of the debug check and use it to decrement the preempt count (from 2
> to 1).
> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
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