linux-kernel - Re: [PATCH 1/3] driver core: export lock_device_hotplug/unlock_device

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Message-ID: <2420637.jF050I0e1M@vostro.rjw.lan>
Date:	Thu, 12 Feb 2015 05:04:28 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Tang Chen <tangchen@...fujitsu.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	David Rientjes <rientjes@...gle.com>,
	Fabian Frederick <fabf@...net.be>,
	Zhang Zhen <zhenzhang.zhang@...wei.com>,
	Vladimir Davydov <vdavydov@...allels.com>,
	Wang Nan <wangnan0@...wei.com>, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/3] driver core: export lock_device_hotplug/unlock_device_hotplug

On Wednesday, February 11, 2015 12:39:47 PM Andrew Morton wrote:
> On Wed, 11 Feb 2015 16:44:20 +0100 Vitaly Kuznetsov <vkuznets@...hat.com> wrote:
> 
> > add_memory() is supposed to be run with device_hotplug_lock grabbed, otherwise
> > it can race with e.g. device_online(). Allow external modules (hv_balloon for
> > now) to lock device hotplug.
> > 
> > ...
> >
> > --- a/drivers/base/core.c
> > +++ b/drivers/base/core.c
> > @@ -55,11 +55,13 @@ void lock_device_hotplug(void)
> >  {
> >  	mutex_lock(&device_hotplug_lock);
> >  }
> > +EXPORT_SYMBOL_GPL(lock_device_hotplug);
> >  
> >  void unlock_device_hotplug(void)
> >  {
> >  	mutex_unlock(&device_hotplug_lock);
> >  }
> > +EXPORT_SYMBOL_GPL(unlock_device_hotplug);
> >  
> >  int lock_device_hotplug_sysfs(void)
> >  {
> 
> It's kinda crazy that lock_device_hotplug_sysfs() didn't get any
> documentation.  I suggest adding this while you're in there:
> 
> 
> --- a/drivers/base/core.c~a
> +++ a/drivers/base/core.c
> @@ -61,6 +61,9 @@ void unlock_device_hotplug(void)
>  	mutex_unlock(&device_hotplug_lock);
>  }
>  
> +/*
> + * "git show 5e33bc4165f3ed" for details
> + */
>  int lock_device_hotplug_sysfs(void)
>  {
>  	if (mutex_trylock(&device_hotplug_lock))
> 
> which is a bit lazy but whatev.
> 
> I'll assume that Greg (or Rafael?) will be processing this patchset.

Well, I would do that if I saw it (my address in the CC has been deprecated
for several months now).

Vitaly, can you please resend with a CC to a valid address of mine, please?

Rafael

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