Re: Required backwards support level?

On Son, 2014-04-06 at 15:26 +0300, Lauri Kasanen wrote:

Hi,

Obviously old userspace + new kernel combo needs to be supported. But I'm not so sure about a mixed case, does old userspace + new userspace need to be supported to run at the same time?

For example, a new 64-bit mesa+libdrm and a 32-bit old set, both running apps at the same time.

Or is it acceptable to assume that once a new userspace has been run, an old one won't be run for this boot?

I'm afraid not. Trivial counter-example: Build Git snapshot from after your changes, hit regression (not necessarily related to your changes), run git bisect involving snapshots from before your changes.