linux-kernel - Re: [RFC][PATCH 0/2] staging: alarm-dev: compat

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Date:	Fri, 11 Jan 2013 14:03:12 -0800
From:	Colin Cross <ccross@...gle.com>
To:	John Stultz <john.stultz@...aro.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Serban Constantinescu <serban.constantinescu@....com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [RFC][PATCH 0/2] staging: alarm-dev: compat_ioctl support

On Fri, Jan 11, 2013 at 1:48 PM, John Stultz <john.stultz@...aro.org> wrote:
> This is a first-pass at implementing compat_ioctl support for
> Android's alarm-dev driver in staging.
>
> The first patch is some refactoring to cleanup and separate the
> copying of user data from the logic, and the second patch adds
> the compat_ioctl support.
>
> As noted in the patch, the only really squirly bit is the handling
> of ANDROID_ALARM_SET_OLD and ANDROID_ALARM_SET_AND_WAIT_OLD. These
> are present to support existing older Android applications.
> Unfortunately these cause ioctl number aliasing issues with
> the compat ioctls, so on 64bit they are only supported in the
> compat patch (since any existing android app old enough to use
> them are likely 32bit).
>
> I'd appreciate feedback from the Android devs on if this is
> an ok assumption and if it might be reasonable to establish
> some sort of a phase-out timeline for the _OLD ioctl support.

The "support old userspace code" comment for those two ioctls has been
there since pre-Android 1.0.  Those apis are not exposed to Android
apps, I don't see any problem deleting them.
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