Messages in this thread | ![/](/images/icornerl.gif) | | Date | Tue, 30 Sep 2003 13:39:12 +0200 | From | Sam Ravnborg <> | Subject | Re: RFC: [2.6 patch] disallow modular IPv6 |
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On Tue, Sep 30, 2003 at 11:02:49AM +0100, David Woodhouse wrote: > On Tue, 2003-09-30 at 02:24 -0700, David S. Miller wrote: > > I think they are the same. It's module building depending upon the > > kernel image being up to date. > > > > modules: vmlinux image > > ... blah blah blah > > > > or however you want to express it in the makefiles. > > In the case of modversions, we are talking about the fact that it may be > physically _impossible_ to build a module referencing an in-kernel > symbol, if the checksum required for that symbol -- the 'version string' > -- is not yet calculated. If the version strings are generated as a > side-effect of compiling the files which actually export the symbols in > question, then it's necessary to do that before building any module > which attempts to use those symbols. The version strings are made from info obtained from vmlinux and the *.o files. So vmlinux is a prerequisite to calculate the version string. And to get vmlinux you need to build the kernel. And the build system will check all dependencies when it needs vmlinux.
> Note that it's not actually necessary to provide a vmlinux file, nor to > do any linking. It's only necessary to perform those steps which produce > the version strings for those symbols actually referenced by the modules > which are being built.
Which require vmlinux and other module.o files.
> That is the requirement for correctness from the makefiles; nothing > more. Of course it's usually considered acceptable for the makefiles to > recompile _more_ than is necessary
I would like to know if there exists any cases where _more_ (or less) is being build. Mostly I consider it a bug in such case, but there are a few corner cases.
[Only commenting on the kbuild side of things - I'm not trying to be involved in the other part of the discussion ;-)]
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