Re: Kernel Application Binary Interface (kABI) support in FreeBSD

Yes, I think the FreeBSD developers have been doing this since before
Redhat was a thing.



-a


On 20 July 2015 at 23:02, Venkat Duvvuru
<venkatkumar.duvvuru_at_avagotech.com> 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?
>
> 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 <allanjude_at_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.
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>>
>> 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
>>
>>
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