linux-kernel - Re: [PATCH 01/25] fs/buffer: Convert to hotplug state machine

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Date:   Thu, 10 Nov 2016 17:31:10 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Al Viro <viro@...IV.linux.org.uk>
cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        linux-kernel@...r.kernel.org, rt@...utronix.de,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 01/25] fs/buffer: Convert to hotplug state machine


On Thu, 10 Nov 2016, Al Viro wrote:

> On Thu, Nov 03, 2016 at 03:49:57PM +0100, Sebastian Andrzej Siewior wrote:
> > Install the callbacks via the state machine.
> 
> > diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
> > index afe641c02dca..69b74fa0da60 100644
> > --- a/include/linux/cpuhotplug.h
> > +++ b/include/linux/cpuhotplug.h
> > @@ -30,6 +30,7 @@ enum cpuhp_state {
> >  	CPUHP_ACPI_CPUDRV_DEAD,
> >  	CPUHP_S390_PFAULT_DEAD,
> >  	CPUHP_BLK_MQ_DEAD,
> > +	CPUHP_FS_BUFF_DEAD,
> >  	CPUHP_WORKQUEUE_PREP,
> >  	CPUHP_POWER_NUMA_PREPARE,
> >  	CPUHP_HRTIMERS_PREPARE,
> 
> *ouch*
> 
> So we are getting a large list of things from unrelated subsystems, maintained
> in a single place, all next to each other.  All examples of that sort of
> thing I can recall had ended up biting our arses...

I rather have my arse bitten by a few merge conflicts than constantly
chasing why odering by chance, link order or magic constants in random
files make things explode or not work.

Thanks,

	tglx