linux-kernel - Re: [tip:locking/core] sched/wait: Fix signal handling in bit wait helpers

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Message-ID: <20151209074033.GF6357@twins.programming.kicks-ass.net>
Date:	Wed, 9 Dec 2015 08:40:33 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	NeilBrown <nfbrown@...ell.com>
Cc:	torvalds@...ux-foundation.org, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, efault@....de, mingo@...nel.org,
	hpa@...or.com, vladimir.murzin@....com,
	linux-tip-commits@...r.kernel.org, jstancek@...hat.com,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: [tip:locking/core] sched/wait: Fix signal handling in bit wait
 helpers

On Wed, Dec 09, 2015 at 12:06:33PM +1100, NeilBrown wrote:
> On Tue, Dec 08 2015, Peter Zijlstra wrote:
> 
> >>  
> >
> > *sigh*, so that patch was broken.. the below might fix it, but please
> > someone look at it, I seem to have a less than stellar track record
> > here...
> 
> This new change seems to be more intrusive than should be needed.
> Can't we just do:
> 
> 
>  __sched int bit_wait(struct wait_bit_key *word)
>  {
> +	long state = current->state;

No, current->state can already be changed by this time.
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