On Sun, 2009-07-05 at 10:24 -0300, Henrique de Moraes Holschuh wrote: > This is good, but not complete. Changes to the API that don't change the > size (or those which reduces it) are a problem: they are impossible with a > schema that detects API version by the size alone. Umm, no, we can also add operations as required already. > Maybe a new field with a API serial number should be added right _now_ while > it is still not too painful to do it? This would be V2 of the API > (detectable by the size change), but there aren't many users yet, so the > effort to support it would not be daunting. > > You can also publish the API version through a read-only sysfs attribute or > a separate IOCTL... it doesn't really need to be in-band (although in-band > is a lot better). No. This patch doesn't change anything at all. It just reduces the _subtlety_ involved in actually doing a size change, nothing more. A real event version is _not_ necessary at all. In fact, I would argue that basing _anything_ on the "version" rather than the "feature set" is useless. johannes
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