On 7/21/15 2:02 PM, Venkat Duvvuru wrote:
Yes, my question was about kernel module compatibililty with FreeBSD's
major releases of a particular version.
For example, will FreeBSD makes sure that the driver built on 10.0 version
of Freebsd seamlessly load on all other 10.x versions of FreeBSD?
Does it make sure that the symbols and their parameters are not blindly
changed without considering the binary compatibility with other FreeBSD
version binaries?
Our aim is that a module compiled on X.0 should be loadable on X.Y for
all values of Y.
This is true for most of the subsystems that people expect to touch
with modules.
i.e. the network stack, driver framework, IO paths, system call
interfaces, scheduler exported calls.
and the structures they use. Note, a module compiled on X.Y is not
guaranteed (or expected) to run
on systems with smaller values of Y.
RHEL kABI whitelist makes sure that once the symbol is added into the
whitelist, it will never be changed during the major releases of that
kernel.
Thanks,
Venkat.
On Fri, Jul 17, 2015 at 8:29 PM, Allan Jude <allanj...@freebsd.org> wrote:
On 2015-07-17 10:47, Julian Elischer wrote:
On 7/17/15 9:02 PM, Venkat Duvvuru wrote:
Hi,
Is there kABI (Kabi-whitelist) equivalent feature in FreeBSD?
well, yes and no.
Firstly, FreeBSD maintains a backwards compatible kABI (with the
exception of programs that hunt around in kernel memory).
We also use symbol versioning on the libc. so depending on what you want
to do. the answer may be useful to you or not.
Basically any binary should continue to run on a newer kernel, even if
the syscalls change, because we should still support the old abi.
tell us more about what you need and we can be more specific.
I have run Freebsd 1.1 binaries on a Freebsd 8 system, in fact I have
done a system build in a freebsd 1.1 chroot on an 8 system.
I haven't tried it on 9 or 10 but I'd expect it to work..
Thanks,
Venkat.
_______________________________________________
freebsd-current@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-current
To unsubscribe, send any mail to
"freebsd-current-unsubscr...@freebsd.org"
_______________________________________________
freebsd-current@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-current
To unsubscribe, send any mail to "
freebsd-current-unsubscr...@freebsd.org"
I think the question related to drivers (kernel modules).
In which case, they should be compatible across major versions (module
from 10.0 works in 10.2, but not 9.3 or 11.0)
--
Allan Jude
_______________________________________________
freebsd-current@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-current
To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
_______________________________________________
freebsd-current@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-current
To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
