linux-kernel - Re: [PATCH] android: binder: fix type mismatch warning

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Message-ID: <CAK8P3a0_dOue+3jYaH3PNNvur7gpMaAVOm5MHfrZykj+3Z0Saw@mail.gmail.com>
Date:   Mon, 18 Sep 2017 17:35:03 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Arve Hjønnevåg <arve@...roid.com>,
        Riley Andrews <riandrews@...roid.com>,
        devel@...verdev.osuosl.org, Todd Kjos <tkjos@...roid.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        John Stultz <john.stultz@...aro.org>,
        Martijn Coenen <maco@...roid.com>
Subject: Re: [PATCH] android: binder: fix type mismatch warning

On Mon, Sep 18, 2017 at 4:02 PM, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>> However, there is another problem with the Kconfig option: turning
>> it on or off creates two incompatible ABI versions, a kernel that
>> has this enabled cannot run user space that was built without it
>> or vice versa. A better solution might be to leave the option hidden
>> until the binder code is fixed to deal with both ABI versions.
>
> I don't know if that is ever going to be fixed, as it's not an issue
> that you will ever see "in the wild" from what I can tell...

Probably not on a native Android device or even a Chromebook that
ships a binder user space together with a kernel, but what about
people using "anbox" or similar projects that allow you to run
Android apps in a container?

It seems like a legitimate use case of the binder modules, but
now there is a kernel Kconfig option that has to match a user
space binary.

       Arnd