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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
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