Messages in this thread | | | Date | Wed, 21 Jul 2010 17:12:41 +0200 | From | Tejun Heo <> | Subject | Re: Dead Config in mm/percpu.c |
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On 07/21/2010 11:22 AM, Christian Dietrich wrote: > Hi all! > > As part of the VAMOS[0] research project at the University of > Erlangen we are looking at multiple integrity errors in linux' > configuration system. > > I've been running a check on the mm/ sourcetree for > config Items not defined in Kconfig and found 1 such case. Sourcecode > blocks depending on these Items are not reachable from a vanilla > kernel -- dead code. I've seen such dead blocks made on purpose > e.g. while integrating new features into the kernel but generally > they're just useless. > > We found, that CONFIG_NEED_PER_CPU_KM is a dead symbol, so it isn't defined > anywhere. Cause of that the percpu_km.c is never included anywhere. Is > this a intended dead symbol, for use in out of tree development, or is > this just an error?
Oh, it's new code waiting to be used. It's for cases where SMP is used w/o MMU. IIRC, it was blackfin.
Thanks.
-- tejun
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