On Thu, Dec 09, 2010 at 11:16:47AM -0800, Dmitry Torokhov wrote: > On Thu, Dec 09, 2010 at 08:04:36PM +0100, Henrik Rydberg wrote: > > On 12/09/2010 10:39 AM, Dmitry Torokhov wrote: > > > > > The desire to keep old names for the EVIOCGKEYCODE/EVIOCSKEYCODE while > > > extending them to support large scancodes was a mistake. While we tried > > > to keep ABI intact (and we succeeded in doing that, programs compiled > > > on older kernels will work on newer ones) there is still a problem with > > > recompiling existing software with newer kernel headers. > > > > > > New kernel headers will supply updated ioctl numbers and kernel will > > > expect that userspace will use struct input_keymap_entry to set and > > > retrieve keymap data. But since the names of ioctls are still the same > > > userspace will happily compile even if not adjusted to make use of the > > > new structure and will start miraculously fail in the field. > > > > > > To avoid this issue let's revert EVIOCGKEYCODE/EVIOCSKEYCODE definitions > > > and add EVIOCGKEYCODE_V2/EVIOCSKEYCODE_V2 so that userspace can explicitly > > > select the style of ioctls it wants to employ. > > > > > > Signed-off-by: Dmitry Torokhov <dtor@xxxxxxx> > > > --- > > > > > > Would the header change suffice in itself? > > We still need to change evdev to return -EINVAL on wrong sizes but yes, > the amount of change there could be more limited. I just thought that > splitting it up explicitly shows the differences in handling better. If > people prefer the previos version we could leave it, I am 50/50 between > them. > *ping* Mauro, Jarod, do you have an opinion on this? I think we need to settle on a solution before 2.6.37 is out. Thanks. -- Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
