linux-kernel - Re: [patch] Rename CAP_EPOLLWAKEUP to CAL_BLOCK

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Date:	Tue, 17 Jul 2012 15:54:31 +0200
From:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:	"Serge E. Hallyn" <serge@...lyn.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux PM list <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Magnus Damm <magnus.damm@...il.com>, markgross@...gnar.org,
	Matthew Garrett <mjg@...hat.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Arve Hjønnevåg <arve@...roid.com>,
	John Stultz <john.stultz@...aro.org>,
	Brian Swetland <swetland@...gle.com>,
	Neil Brown <neilb@...e.de>,
	Alan Stern <stern@...land.harvard.edu>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>, mtk@....net,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [patch] Rename CAP_EPOLLWAKEUP to CAL_BLOCK_SUSPEND

On Tue, Jul 17, 2012 at 3:46 PM, Serge E. Hallyn <serge@...lyn.com> wrote:
> Quoting Michael Kerrisk (mtk.manpages@...il.com):
>> Rafael,
>>
>> As discussed in
>> http://thread.gmane.org/gmane.linux.kernel/1249726/focus=1288990,
>> the capability introduced in 4d7e30d98939a0340022ccd49325a3d70f7e0238
>> to govern EPOLLWAKEUP seems misnamed: this capability is about governing
>> the ability to suspend the system, not using a particular API flag
>> (EPOLLWAKEUP). We should make the name of the capability more general
>> to encourage reuse in related cases. (Whether or not this capability
>> should also be used to govern the use of /sys/power/wake_lock is a
>> question that needs to be separately resolved.)
>>
>> This patch renames the capability to CAP_BLOCK_SUSPEND. In order to ensure
>> that the old capability name doesn't make it out into the wild, could you
>> please apply and push up the tree to ensure that it is incorporated
>> for the 3.5 release.
>>
>> Thanks,
>>
>> Michael
>>
>> Signed-off-by: Michael Kerrisk <mtk.manpages@...il.com>
>
> I definately like that name better, thanks.  Don't know if renaming it
> without an alias could cause trouble for some bleeding edge userspaces?
> Would it be worth keeping the
>
> #define CAP_EPOLLWAKEUP      36
>
> line?  If this is deemed early enough I do prefer not to complicate with
> a duplicate name.

Maybe I'm too ignorant. Are there userspaces that bleed with the -rc
series? I'd have thought this renaming would be a fairly safe change
at this point.

> Acked-by: Serge Hallyn <serge.hallyn@...onical.com>

Thanks,

Michael


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Author of "The Linux Programming Interface"; http://man7.org/tlpi/
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