svn commit: r204309 - in head/sys: amd64/amd64 amd64/isa conf i386/bios i386/cpufreq i386/i386 i386/isa i386/xen isa modules/bios/smbios modules/bios/vpd modules/cpufreq pc98/pc98 x86 x86/bios x86/...

[M. Warner Losh]

In message: <3bbf2fe11002251732t35179d9ar3c3f39aafe75d5c2 at mail.gmail.com>
            Attilio Rao <attilio at FreeBSD.org> writes:
: 2010/2/26 Xin LI <delphij at gmail.com>:
: > On Thu, Feb 25, 2010 at 3:48 PM, Attilio Rao <attilio at freebsd.org> wrote:
: >> 2010/2/26 M. Warner Losh <imp at bsdimp.com>:
: >>> In message: <201002251413.o1PEDdKV033584 at svn.freebsd.org>
: >>>            Attilio Rao <attilio at FreeBSD.org> writes:
: >>> : Author: attilio
: >>> : Date: Thu Feb 25 14:13:39 2010
: >>> : New Revision: 204309
: >>> : URL: http://svn.freebsd.org/changeset/base/204309
: >>> :
: >>> : Log:
: >>> :   Introduce the new kernel sub-tree x86 which should contain all the code
: >>> :   shared and generalized between our current amd64, i386 and pc98.
: >>> :
: >>> :   This is just an initial step that should lead to a more complete effort.
: >>> :   For the moment, a very simple porting of cpufreq modules, BIOS calls and
: >>> :   the whole MD specific ISA bus part is added to the sub-tree but ideally
: >>> :   a lot of code might be added and more shared support should grow.
: >>>
: >>> Cool!
: >>>
: >>> :   Sponsored by:       Sandvine Incorporated
: >>> :   Reviewed by:        emaste, kib, jhb, imp
: >>> :   Discussed on:       arch
: >>> :   MFC:                3 weeks
: >>>
: >>> Is this really wise?  Are these changes KPI neutral?
: >>
: >> I don't think there are (still) KPI changes.
: >> Which one are you referring to?
: >
: > I think Warner means that there will be some header files to change
: > their location, making certain (I doubt there is any but just in case)
: > kernel modules maintained by third party to break (technically these
: > are not part of KPI but something that _could_ make third party
: > developers unhappy I guess).
: 
: Yes but what is already compiled (thirdy-part modules included) will
: keep working without a glance.

Yes, but modules can't be recompiled.  That's why I said KPI rather
than KBI.

: I think there have been already MFCed patches doing headers movements
: in the past.

We've tried to keep the KPI upwardly compatible.  If files move, then
old code will potentially break.

Warner