Re: [PATCH] Preserve task state in reentrant calls to ___wait_event

From: Peter Zijlstra
Date: Sat Nov 07 2015 - 04:20:19 EST

On Fri, Nov 06, 2015 at 08:44:08PM +0000, Chris Bainbridge wrote:
> I am assuming here that wait_event_timeout() is supposed to support reentrant
> calls.

Not really. It is sort of allowed, provided the inner one will rarely
block. And therefore the outer one will mostly work.

> If not, perhaps it should BUG_ON when called with a non-running task
> state,

There is a warning in __might_sleep() that catches some of this.

> and the SBS HC / ACPI EC code needs to be fixed to stop doing this.

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