Re: Minor sysupgrade issue

[Brad Spencer <brad%anduin.eldar.org@localhost>]

Chavdar Ivanov <ci4ic4%gmail.com@localhost> writes:

[snip]

>                                              But then wouldn't be
> there a chance that the old userland disagrees with the new kernel?
>


As a general statement, that should not be a problem as long as the
kernel has the COMPAT_* options set.

My own personal experience is that since about 1995, I have encountered
exactly two instances where the newer kernel would not run the older
userland completely correctly assuming the new kernel had the COMPAT_*
options.  One was very early where some programs from a 0.9 userland had
trouble with a 1.0 kernel.  I never understood what was going on, and a
recompile of the programs fixed them.  The second was around the 4.x -
6.x time frame where a system call was removed completely and old
userland had trouble.  So if you were going from 4.x to something more
recent, you might have some problems especially with pkgsrc.




-- 
Brad Spencer - brad%anduin.eldar.org@localhost - KC8VKS - http://anduin.eldar.org